CA1203892A - Color television camera apparatus with self-diagnosis function - Google Patents
Color television camera apparatus with self-diagnosis functionInfo
- Publication number
- CA1203892A CA1203892A CA000441094A CA441094A CA1203892A CA 1203892 A CA1203892 A CA 1203892A CA 000441094 A CA000441094 A CA 000441094A CA 441094 A CA441094 A CA 441094A CA 1203892 A CA1203892 A CA 1203892A
- Authority
- CA
- Canada
- Prior art keywords
- data
- video signal
- camera apparatus
- television camera
- color television
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/02—Diagnosis, testing or measuring for television systems or their details for colour television signals
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- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- General Health & Medical Sciences (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Color Television Image Signal Generators (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
Abstract
Abstract of the Disclosure In a color television camera apparatus wherein a video signal is adjusted by the steps of detecting adjustment data with respect to predetermined adjustment items from the video signal corresponding to the pattern of a test chart, comparing the adjustment data with reference data to obtain correcting data and supplying the correcting data to a video signal adjusting circuit, the correcting data is modified by variation data stored in a memory in advance and the modified correcting data is supplied to the video signal adjusting circuit. The difference between the video signals adjusted on the basis of the correcting data and the modified correcting data is then calculated and judgement is made on whether the difference falls within a predetermined allowable range, whereby abnormality in the control system of the color television camera apparatus can be detected.
Description
- lZ~3~92 COLOR TELEVISION CAMERA APPARATUS
WITH SELF-DIAGNOSIS FUNCTION
Background of the Invention This invention relates to a television camera apparatus, and more particularly to a color television camera apparatus with self-diagnosis function.
During the operation of a conventional color television camera apparatus, an adjustment which is called "routine adjustment" is automatically carried out by means of an adjusting means built into the apparatus. In this type of adjustment a predetermined test chart such as a registration chart is picked up by the camera apparatus and video signals from the camera correspondingto,the predetermined chart are supplied to a signal processing section incorporated in the apparatus. In the signal processing section the video signals are subjected to adjustments such as gain control, gamma correction, pedestal level correction.~ The video signals thus processed are supplied to a data detecting section. In this section an adjustment data is detected from the video signal and is supplied to an arithmetic operation section in which correcting data is calculated by comparing the adjustment data with a reference data previously stored in a memory section. The correcting data is converted by a correction signal circuit into an analog correcting signal and then is supplied to a defecting circuit and also to a signal processing ~' ~Z03892 circuit. Further, the correcting data is stored in the memory section.
As stated above, a video signal control system for a color television camera apparatus has control sensitivities corresponding to each adjustment items.
In the course of time, however, the circuits in the~
control system are subjected to natural deterioration and changes occur in the circuit constants. Minor errors, though individuàlly negligible, may, in the course of time, add up into such a degree as to manifests themselves as a sudden debasement of control accuracy in the system with resultant failure in the operation of the camera apparatus.
A conventional method of checking the operation of the video signal control system of the color tele-vision camera apparatus consists of steps of ~xr- ;n;ng the individual circuits of the system one by one in ~; which the output conditions thereof are detected for possible fault in the system operation. The power source is also checked. However, such a method requires the use of certain measuring instruments. Furthermore, .
this checking method is not preventive. That is, it ~ ~ ~ cannot forecast the~occurrence of trouble and therefore ;~ corrective actions should be t~aken only after the 25 ~ ~h~o ~ 1 ity in the video signal output or in the power source w ltage is observed.
lZ03892 Summary of the Inveniton The present invention is directed to provide a color television camera apparatus with self-diagnosis function which provides a means of checking its video signal control system for abnormalities possibly occurs in future during the operation of the apparatus and preventing the possible failure of the camera apparatus in advance without the use of measuring instruments.
In accordance with the present invention, the system of checking the condition of the video signal control system for a color television camera apparatus comprises data detecting means for detecting the ad~ustment data for predetermined adjustment items from a video signal corresponding to the pattern of a test chart, arithmetic operation means for calculating correcting data on the basis of the comparison of the adjustment data with a prestored reference data, ~: adjusting means for adjusting the video signal by the correcting data, variation data supplying means for supplying a variation data, data modifying means for modifying the correcting data with the variation data to produce a modified data calculating means for culculating the difference between the video signal adjusted by the correcting data and the video signal adjusted by the modified data, and a judging means for judging whether or not the difference falls within a predetermined allowable range.
. - ~ .
1:203~
According to the present invention, self-diagnosis on the control system of color television camera apparatus can be performed by making use of the operation of the control system itself, thus obviating the use of measuring instruments otherwise required.
Further this invention enables to detect a suspicious irregularity, which is hardly traceable by conventional failure detection methods, not serious enough to constitute a problem in`the control system but likely to develop into a failure in the future.
Brief Description of the Drawing In the accompanying drawings:
Fig. 1 is a block diagram showing a color television apparatus in accordance with the present invention;
Fig. 2 is an example of a test chart;
Fig. 3 is the waveform of a marker signal corresponding to a rotation marker;
Fig. 4 is the waveform of a gray scale signal with the corresponding gray scale;
Fig. 5 shows the difference of video signals with respect to a predetermined marker; and Fig. 6 is a flowchart showing an example of the diagnosis steps of the present invention.
Detailed Description of the Preferred Embodiment `~' ~;203Hg2 Referring now to Fig. 1, the outputs of red, blue and green color television tubes 11, 12, and 13 are connected, respectively, to the inputs of gain control circuits 15, 16, and 17 provided in a signal processing section 14. The outputs of the gain control circuits 15, 16, and 17 are connected, respectively, to the input of gamma correction circuits 18, 19 and 20. The outputs of the gamma correction circuits 18, 19 and 20 are connected, respectively, to the inputs of pedestal level correction circuits 21, 22 and 23. The outputs of the pedestal level correction circuits 21, 22 and 23 are connected, respectively, to the inputs of a switch circuit 25 provi~ed in a data detecting section 24. The outputs of the switch circuit 25 are connected to the input of a gate circuit 26 and to the input of a sample hold circuit 27. The output of the gate circuit 26 is connected to the input of a position detection circuit 28. The outputs of the position detection circuit 28 and sample hold circuit 27 are connected, respectively, to an arithmetic operation section, for example, a CPU 31, via A-D converters 29 and 30.
To the CPU 31 are connected memories 32, 33 and 42. To the memor~ 42 is connected a correction signal circuit 34. This circuit 34 includes a D-A
converter which converts the digital data stored in the memory 42 into an analog signal.
12031!3~:~
Deflection circuits 39, 40 and 41 are connected to deflection coils 36, 37 and 38 of the television camera tubes 11, 12 and 13.
When, in the above-mentioned circuit con=
struction, a test chart 50 as shown in Fig. 2 is picked up by the television camera tubes 11, 12 and 13, the video signals corresponding to the pattern of the test chart 50 are outputted from the camera tubes 11, 12 and 13. The test chart is provided with gray scale 51, substantially V-shaped reference markers 52, 53 and 54, and rotation detection markers 55 and 56. The reference markers 52, 53 and 54 each have a pair of lines 58a, 58b which are each inclined at an angle of ~ = 45 with respect to a central axis 57. Each of the rotation detection markers 55 and 56 has a line 59 which is inclined at an angle ~ of less than ~ - 45 with respect to the horizontal line.
When supplied to the signal processing section 14, the three color video signals corresponding to the pattern of the test chart 50 having such markers as shown in Fig. 2 are subjected, by the gain control circuits, gamma correction circuits and pedestal level correction circuits of the section 14, to gain control, gamma correction and pedestal level correction, respectively. These three color video signals, which have passed through the signal processing section 14 are inputted to the three inputs of the switch circuit ~203~
25 of the data detecting section 24. By this switch circuit 25 the G video signal is supplied to the gate circuit 26 and to the sample hold circuit 27. The gate circuit 26, in response to a gate pulse applied there to, supplies the G video signal to the position detecting circuit 28. From a G marker pulse for the G video signal the marker position is detected by position detecting circuit 28, In this case, detection of the marker position is made by the G marker pulse which, as shown in Fig. 3, is generated when a scanning line 60 has passed through the marker 52. The detection signal thus obtained is converted by the A-D
converter 29 into a digital value and is stored, as a G marker data, in the memory 32.
In the sample hold circuit 27, the gray scale signals Sa, Sb and Sc corresponding to the regions 51a, 51b and 51c of the gray scale 51 shown in Fig. 4 are picked up from the G video signal in response to the gate pulse, and then are converted by the A-D
converter 30 into a digital value and are then stored, as G gray scale data, in the memory.
It should be noted that the G gray scale data and the G marker data are adopted as the reference data and are used for comparison, in a ~nner to be described in detail later, with the B gray scale data and B marker data as well as the R gray scale data and R marker data.
;~92 Next, when the B video signal is supplied from the switch circuit 25 to the gate circuit 26 and also to the sample hold circuit 27, the B marker pulse and the gray scale signals Sa, Sb and Sc are obtained in the same manner as in the case of G video signal.
The B marker pulse is converted by the A-D converter 29 into a digital B maker data. This B marker data and the G marker data of the memory 32 are compared with each other by CPU 31, whereby the difference between the B and G marker data is detected. The difference data is stored in the memory 42. In accordance with that difference data read from the memory 42, a feedback signal, b is supplied from the correction signal circuit 34 to the deflection circuit 40 of the blue television camera tube 12, whereby the B deflection signal is allowed to coincide with the G
deflection signal, i.e., a proper registration is attained.
The gray scale sampling signals Sa, Sb and Sc of the B video signal are converted by the converter 30 into B gray scale data. This B gray scale data is compared by the CPU 31 with the G gray scale data and the resultant difference data is supplied to the correction signal circuit via the memory 42. In accordance with the difference between the B and G
gray scale data, a gain control signal f, gamma correction signal g, and pedestal level correction lZ~ 2 signal h are outputted from the correction signal circuit 34 and are respectively supplied to their corresponding circuits 16, 19 and 22.
In the same manner as stated above, the position detection of the marker is made with respect to the R video signal and the sampling of the gray scale signal is also carried out. The R marker pulse which is obtained from the position detection is converted into a digital R marker data, while the sampled signals which are obtained by the sample hold circuit 27 are converted into digital R gray scale data at the A-D converter 29. The R marker data is compared with the G marker data whereby the difference between both data is det~r~;ned, while the R gray scale data are compared with the G gray scale data whereby the difference between both is determined. The correction signals a, c, d and e corresponding to such difference data are supplied from the correction signal circuit 34 to the corresponding circuits 39, 15, 18 and 21, respectively.
In this way the B marker data and the R
marker data are compared, respectively, with the reference G marker data while the B gray scale data and the R gray scale data with the reference G gray scale data, whereby the differences between each of the compared pairs are calculated by CPU 31. Fro~ these differences the correcting values are calculated. The 12038~2 correcting data corresponding to the correcting values thus obtained is stored as new correcting data, in the memories 32 and 42. From the memory 42, the correcting data is supplied via the correction signal circuit 34 to the respective circuits which perform the desired adjustments. The centering is performed on the basis of the correcting data of the marker 53, the adjustment of the vertical size is carried out based on the correcting data of the markers 52 and 54, while the adjustment of the hori~ontal size is carried out based on the correcting data of the markers 55 and 56. The adjustment of the vertical linearity is performed based on the correcting data of the markers 52, 53 and 54 and the adjustment of rotation is performed based on the correcting data of the markers 55 and 56.
Further, gain control, gamma correction and pedestal level correction are performed on basis of the gray scale signals Sa, Sb, and 5c.
In the m~nner as mentioned above, the various adjustments on the video signal in a color television camera apparatus with the use of a test chart 50 are performed on basis of the correcting data with respect to each adjustment items.
Now, the description will be made on the self-diagnostic function according to this invention.
Firstly, let the correcting data and the variation data be denoted by Di and ~i (i = 1, 2, 3, .... N).
~0~8~2 The video signal outputted from the signal processing section 14 when the correcting data Di is supplied to the correction signal circuit 34 will differ from the video signal when modified data that is the correcting data modified by the variation data ai is supplied. The modified data Mi is formed, for example, by adding or - subtracting-the variation data ~i to or from the cor--rectingdata Di.Moreparticularly"when the correcting data Di for centering adjustment based on the marker 53 is inputted into the correction slgnal circuit 34, the signal processing section 14 will produces a video signal (D-based video siynal) as shown in solid line in Fig. 5. On the other hand, if the modified data Mi is inputted into the correction signal circuit 34, the data processing section 14 will outputs a displaced video signal (M-based video signal), as shown in broken line in Fig. 5. The difference between the D-based video signal and the M-based video signal corresponds to the magnitude of the variance data so long as the video signal control system of the color television camera apparatus functions in normal condition. Any significant abnormality or functional degradation in thR control system, such as improper linearity or gain, would manifest itself as a deviation of the above-mentioned difference from predetermined allowable range. In this -nner, it is possible to check the condition of the video signal ~2038g~
control system of a color television camera apparatus by measuring the difference between the D-based video signal and the M-based video signal.
The color television camera apparatus according to the present invention has the above-mentioned function for checking the condition of the video signal control system, and steps realizing this checking function will be described in conjunction with the flowchart of Fig. 6.
Referring to the flowchart, Step 100 refers to the operation of reading out one of the correcting data Di for an adjustment item from the memory 32.
At Step 101, the corresponding variation data ai is read out from the memory 33. This memory 33 is a ROM
(read-only memory) in which sensitivity data ~i indicative of the sensitivity inherent to the video signal control system is stored, which will be described later. Then, the variation data ai is added to or - subtracted from: the correcting data Di to form the modified data Mi, which is in turn supplied to the correction signal circuit 34 (Step 102). The correction signal circuit 34 in turn produces an analog signal corresponding to the modified data Mi. Now, supposing that the correcting data Di is a data for centering adjustment a difference will arise between the D-based video signal and the M-based video signal following the ~rocess of Step 2, as dipicted in Fig. 5. This difference ~03~
is calculated as a difference between voltages VB and VB' at Step 103. Then, the correcting data Di + 1 for a different adjustment item stored in the memory 32 and the corresponding variation data i + 1 in the memory 33 are read out (Step 104). This process is - denoted by the notation i = i ~ 1 in the flowchart.
Likewise, the difference between the D-based video signal and the M-based video signal for this adjustment item is measured. The above Steps 100 to 104 are repeated until the last correcting data Dn and the modified data Mn. The decision as to if the data processing has been completed takes place at Step 105.
At Step 106, whether the difference between the D-based video signal and the M-based video signal falls within a predetermined allowable range is judged for all the correcting data Di (i = 1, 2, 3, .... N).
The results of judgement are displayed on a display unit 43 at Step 107 or 108.
For example, referring to Fig. 5, the differ-ence between the both video signals is VB - VB ! . This difference corresponds to the product of the values of the variation data ai and the sensitivity coefficient ki inherent to the signal control system, so long as the camera apparatus operates in normal condition.
However, the difference exceeds the value of the product in abnormal conditions. The sensitivity coefficient ki is stored along with the variation data ai in the ~203*92 memory 33. The operation of Step 106 consists of comparing the variance VB-VB' and the product of Ki and al to judge whether the difference between them is within predetermined allowable range. In this way, the abnormalities of the video signal control system is checked based on the above judgement.
It should be understood that, although the arithmetic operations in this system are performed by CPU 31, this is a matter of choice, and is not lntended to limit this invention to this design. For example, the task of these operations may be achieved by a different circuit or circuits in the camera apparatus.
WITH SELF-DIAGNOSIS FUNCTION
Background of the Invention This invention relates to a television camera apparatus, and more particularly to a color television camera apparatus with self-diagnosis function.
During the operation of a conventional color television camera apparatus, an adjustment which is called "routine adjustment" is automatically carried out by means of an adjusting means built into the apparatus. In this type of adjustment a predetermined test chart such as a registration chart is picked up by the camera apparatus and video signals from the camera correspondingto,the predetermined chart are supplied to a signal processing section incorporated in the apparatus. In the signal processing section the video signals are subjected to adjustments such as gain control, gamma correction, pedestal level correction.~ The video signals thus processed are supplied to a data detecting section. In this section an adjustment data is detected from the video signal and is supplied to an arithmetic operation section in which correcting data is calculated by comparing the adjustment data with a reference data previously stored in a memory section. The correcting data is converted by a correction signal circuit into an analog correcting signal and then is supplied to a defecting circuit and also to a signal processing ~' ~Z03892 circuit. Further, the correcting data is stored in the memory section.
As stated above, a video signal control system for a color television camera apparatus has control sensitivities corresponding to each adjustment items.
In the course of time, however, the circuits in the~
control system are subjected to natural deterioration and changes occur in the circuit constants. Minor errors, though individuàlly negligible, may, in the course of time, add up into such a degree as to manifests themselves as a sudden debasement of control accuracy in the system with resultant failure in the operation of the camera apparatus.
A conventional method of checking the operation of the video signal control system of the color tele-vision camera apparatus consists of steps of ~xr- ;n;ng the individual circuits of the system one by one in ~; which the output conditions thereof are detected for possible fault in the system operation. The power source is also checked. However, such a method requires the use of certain measuring instruments. Furthermore, .
this checking method is not preventive. That is, it ~ ~ ~ cannot forecast the~occurrence of trouble and therefore ;~ corrective actions should be t~aken only after the 25 ~ ~h~o ~ 1 ity in the video signal output or in the power source w ltage is observed.
lZ03892 Summary of the Inveniton The present invention is directed to provide a color television camera apparatus with self-diagnosis function which provides a means of checking its video signal control system for abnormalities possibly occurs in future during the operation of the apparatus and preventing the possible failure of the camera apparatus in advance without the use of measuring instruments.
In accordance with the present invention, the system of checking the condition of the video signal control system for a color television camera apparatus comprises data detecting means for detecting the ad~ustment data for predetermined adjustment items from a video signal corresponding to the pattern of a test chart, arithmetic operation means for calculating correcting data on the basis of the comparison of the adjustment data with a prestored reference data, ~: adjusting means for adjusting the video signal by the correcting data, variation data supplying means for supplying a variation data, data modifying means for modifying the correcting data with the variation data to produce a modified data calculating means for culculating the difference between the video signal adjusted by the correcting data and the video signal adjusted by the modified data, and a judging means for judging whether or not the difference falls within a predetermined allowable range.
. - ~ .
1:203~
According to the present invention, self-diagnosis on the control system of color television camera apparatus can be performed by making use of the operation of the control system itself, thus obviating the use of measuring instruments otherwise required.
Further this invention enables to detect a suspicious irregularity, which is hardly traceable by conventional failure detection methods, not serious enough to constitute a problem in`the control system but likely to develop into a failure in the future.
Brief Description of the Drawing In the accompanying drawings:
Fig. 1 is a block diagram showing a color television apparatus in accordance with the present invention;
Fig. 2 is an example of a test chart;
Fig. 3 is the waveform of a marker signal corresponding to a rotation marker;
Fig. 4 is the waveform of a gray scale signal with the corresponding gray scale;
Fig. 5 shows the difference of video signals with respect to a predetermined marker; and Fig. 6 is a flowchart showing an example of the diagnosis steps of the present invention.
Detailed Description of the Preferred Embodiment `~' ~;203Hg2 Referring now to Fig. 1, the outputs of red, blue and green color television tubes 11, 12, and 13 are connected, respectively, to the inputs of gain control circuits 15, 16, and 17 provided in a signal processing section 14. The outputs of the gain control circuits 15, 16, and 17 are connected, respectively, to the input of gamma correction circuits 18, 19 and 20. The outputs of the gamma correction circuits 18, 19 and 20 are connected, respectively, to the inputs of pedestal level correction circuits 21, 22 and 23. The outputs of the pedestal level correction circuits 21, 22 and 23 are connected, respectively, to the inputs of a switch circuit 25 provi~ed in a data detecting section 24. The outputs of the switch circuit 25 are connected to the input of a gate circuit 26 and to the input of a sample hold circuit 27. The output of the gate circuit 26 is connected to the input of a position detection circuit 28. The outputs of the position detection circuit 28 and sample hold circuit 27 are connected, respectively, to an arithmetic operation section, for example, a CPU 31, via A-D converters 29 and 30.
To the CPU 31 are connected memories 32, 33 and 42. To the memor~ 42 is connected a correction signal circuit 34. This circuit 34 includes a D-A
converter which converts the digital data stored in the memory 42 into an analog signal.
12031!3~:~
Deflection circuits 39, 40 and 41 are connected to deflection coils 36, 37 and 38 of the television camera tubes 11, 12 and 13.
When, in the above-mentioned circuit con=
struction, a test chart 50 as shown in Fig. 2 is picked up by the television camera tubes 11, 12 and 13, the video signals corresponding to the pattern of the test chart 50 are outputted from the camera tubes 11, 12 and 13. The test chart is provided with gray scale 51, substantially V-shaped reference markers 52, 53 and 54, and rotation detection markers 55 and 56. The reference markers 52, 53 and 54 each have a pair of lines 58a, 58b which are each inclined at an angle of ~ = 45 with respect to a central axis 57. Each of the rotation detection markers 55 and 56 has a line 59 which is inclined at an angle ~ of less than ~ - 45 with respect to the horizontal line.
When supplied to the signal processing section 14, the three color video signals corresponding to the pattern of the test chart 50 having such markers as shown in Fig. 2 are subjected, by the gain control circuits, gamma correction circuits and pedestal level correction circuits of the section 14, to gain control, gamma correction and pedestal level correction, respectively. These three color video signals, which have passed through the signal processing section 14 are inputted to the three inputs of the switch circuit ~203~
25 of the data detecting section 24. By this switch circuit 25 the G video signal is supplied to the gate circuit 26 and to the sample hold circuit 27. The gate circuit 26, in response to a gate pulse applied there to, supplies the G video signal to the position detecting circuit 28. From a G marker pulse for the G video signal the marker position is detected by position detecting circuit 28, In this case, detection of the marker position is made by the G marker pulse which, as shown in Fig. 3, is generated when a scanning line 60 has passed through the marker 52. The detection signal thus obtained is converted by the A-D
converter 29 into a digital value and is stored, as a G marker data, in the memory 32.
In the sample hold circuit 27, the gray scale signals Sa, Sb and Sc corresponding to the regions 51a, 51b and 51c of the gray scale 51 shown in Fig. 4 are picked up from the G video signal in response to the gate pulse, and then are converted by the A-D
converter 30 into a digital value and are then stored, as G gray scale data, in the memory.
It should be noted that the G gray scale data and the G marker data are adopted as the reference data and are used for comparison, in a ~nner to be described in detail later, with the B gray scale data and B marker data as well as the R gray scale data and R marker data.
;~92 Next, when the B video signal is supplied from the switch circuit 25 to the gate circuit 26 and also to the sample hold circuit 27, the B marker pulse and the gray scale signals Sa, Sb and Sc are obtained in the same manner as in the case of G video signal.
The B marker pulse is converted by the A-D converter 29 into a digital B maker data. This B marker data and the G marker data of the memory 32 are compared with each other by CPU 31, whereby the difference between the B and G marker data is detected. The difference data is stored in the memory 42. In accordance with that difference data read from the memory 42, a feedback signal, b is supplied from the correction signal circuit 34 to the deflection circuit 40 of the blue television camera tube 12, whereby the B deflection signal is allowed to coincide with the G
deflection signal, i.e., a proper registration is attained.
The gray scale sampling signals Sa, Sb and Sc of the B video signal are converted by the converter 30 into B gray scale data. This B gray scale data is compared by the CPU 31 with the G gray scale data and the resultant difference data is supplied to the correction signal circuit via the memory 42. In accordance with the difference between the B and G
gray scale data, a gain control signal f, gamma correction signal g, and pedestal level correction lZ~ 2 signal h are outputted from the correction signal circuit 34 and are respectively supplied to their corresponding circuits 16, 19 and 22.
In the same manner as stated above, the position detection of the marker is made with respect to the R video signal and the sampling of the gray scale signal is also carried out. The R marker pulse which is obtained from the position detection is converted into a digital R marker data, while the sampled signals which are obtained by the sample hold circuit 27 are converted into digital R gray scale data at the A-D converter 29. The R marker data is compared with the G marker data whereby the difference between both data is det~r~;ned, while the R gray scale data are compared with the G gray scale data whereby the difference between both is determined. The correction signals a, c, d and e corresponding to such difference data are supplied from the correction signal circuit 34 to the corresponding circuits 39, 15, 18 and 21, respectively.
In this way the B marker data and the R
marker data are compared, respectively, with the reference G marker data while the B gray scale data and the R gray scale data with the reference G gray scale data, whereby the differences between each of the compared pairs are calculated by CPU 31. Fro~ these differences the correcting values are calculated. The 12038~2 correcting data corresponding to the correcting values thus obtained is stored as new correcting data, in the memories 32 and 42. From the memory 42, the correcting data is supplied via the correction signal circuit 34 to the respective circuits which perform the desired adjustments. The centering is performed on the basis of the correcting data of the marker 53, the adjustment of the vertical size is carried out based on the correcting data of the markers 52 and 54, while the adjustment of the hori~ontal size is carried out based on the correcting data of the markers 55 and 56. The adjustment of the vertical linearity is performed based on the correcting data of the markers 52, 53 and 54 and the adjustment of rotation is performed based on the correcting data of the markers 55 and 56.
Further, gain control, gamma correction and pedestal level correction are performed on basis of the gray scale signals Sa, Sb, and 5c.
In the m~nner as mentioned above, the various adjustments on the video signal in a color television camera apparatus with the use of a test chart 50 are performed on basis of the correcting data with respect to each adjustment items.
Now, the description will be made on the self-diagnostic function according to this invention.
Firstly, let the correcting data and the variation data be denoted by Di and ~i (i = 1, 2, 3, .... N).
~0~8~2 The video signal outputted from the signal processing section 14 when the correcting data Di is supplied to the correction signal circuit 34 will differ from the video signal when modified data that is the correcting data modified by the variation data ai is supplied. The modified data Mi is formed, for example, by adding or - subtracting-the variation data ~i to or from the cor--rectingdata Di.Moreparticularly"when the correcting data Di for centering adjustment based on the marker 53 is inputted into the correction slgnal circuit 34, the signal processing section 14 will produces a video signal (D-based video siynal) as shown in solid line in Fig. 5. On the other hand, if the modified data Mi is inputted into the correction signal circuit 34, the data processing section 14 will outputs a displaced video signal (M-based video signal), as shown in broken line in Fig. 5. The difference between the D-based video signal and the M-based video signal corresponds to the magnitude of the variance data so long as the video signal control system of the color television camera apparatus functions in normal condition. Any significant abnormality or functional degradation in thR control system, such as improper linearity or gain, would manifest itself as a deviation of the above-mentioned difference from predetermined allowable range. In this -nner, it is possible to check the condition of the video signal ~2038g~
control system of a color television camera apparatus by measuring the difference between the D-based video signal and the M-based video signal.
The color television camera apparatus according to the present invention has the above-mentioned function for checking the condition of the video signal control system, and steps realizing this checking function will be described in conjunction with the flowchart of Fig. 6.
Referring to the flowchart, Step 100 refers to the operation of reading out one of the correcting data Di for an adjustment item from the memory 32.
At Step 101, the corresponding variation data ai is read out from the memory 33. This memory 33 is a ROM
(read-only memory) in which sensitivity data ~i indicative of the sensitivity inherent to the video signal control system is stored, which will be described later. Then, the variation data ai is added to or - subtracted from: the correcting data Di to form the modified data Mi, which is in turn supplied to the correction signal circuit 34 (Step 102). The correction signal circuit 34 in turn produces an analog signal corresponding to the modified data Mi. Now, supposing that the correcting data Di is a data for centering adjustment a difference will arise between the D-based video signal and the M-based video signal following the ~rocess of Step 2, as dipicted in Fig. 5. This difference ~03~
is calculated as a difference between voltages VB and VB' at Step 103. Then, the correcting data Di + 1 for a different adjustment item stored in the memory 32 and the corresponding variation data i + 1 in the memory 33 are read out (Step 104). This process is - denoted by the notation i = i ~ 1 in the flowchart.
Likewise, the difference between the D-based video signal and the M-based video signal for this adjustment item is measured. The above Steps 100 to 104 are repeated until the last correcting data Dn and the modified data Mn. The decision as to if the data processing has been completed takes place at Step 105.
At Step 106, whether the difference between the D-based video signal and the M-based video signal falls within a predetermined allowable range is judged for all the correcting data Di (i = 1, 2, 3, .... N).
The results of judgement are displayed on a display unit 43 at Step 107 or 108.
For example, referring to Fig. 5, the differ-ence between the both video signals is VB - VB ! . This difference corresponds to the product of the values of the variation data ai and the sensitivity coefficient ki inherent to the signal control system, so long as the camera apparatus operates in normal condition.
However, the difference exceeds the value of the product in abnormal conditions. The sensitivity coefficient ki is stored along with the variation data ai in the ~203*92 memory 33. The operation of Step 106 consists of comparing the variance VB-VB' and the product of Ki and al to judge whether the difference between them is within predetermined allowable range. In this way, the abnormalities of the video signal control system is checked based on the above judgement.
It should be understood that, although the arithmetic operations in this system are performed by CPU 31, this is a matter of choice, and is not lntended to limit this invention to this design. For example, the task of these operations may be achieved by a different circuit or circuits in the camera apparatus.
Claims (10)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A color television camera apparatus with self-diagnosis function comprising:
detecting means for detecting adjustment data with respect to predetermined adjustment items from a video signal corresponding to a pattern on a test chart;
arithmetic operation means for calculating a correcting data on the basis of the comparison of said adjustment data with a reference data;
adjusting means for adjusting said video signal based on said correcting data;
variation data supplying means for supplying a variation data;
modifying means for modifying said correcting data by said variation data to produce modified data;
supplyinbg means for supplying said modified data into said adjusting means;
calculating means for calculating the difference between the video signal adjusted by said correcting data and the video signal adjusted by said modified data; and judging means for judging whether said difference calculated by said calculating means falls within a predetermined allowable range.
detecting means for detecting adjustment data with respect to predetermined adjustment items from a video signal corresponding to a pattern on a test chart;
arithmetic operation means for calculating a correcting data on the basis of the comparison of said adjustment data with a reference data;
adjusting means for adjusting said video signal based on said correcting data;
variation data supplying means for supplying a variation data;
modifying means for modifying said correcting data by said variation data to produce modified data;
supplyinbg means for supplying said modified data into said adjusting means;
calculating means for calculating the difference between the video signal adjusted by said correcting data and the video signal adjusted by said modified data; and judging means for judging whether said difference calculated by said calculating means falls within a predetermined allowable range.
2. A color television camera apparatus with self-diagnosis function as set forth in claim 1, further comprising display means for displaying the result of the judgement made by said judgement means.
3. A color television camera apparatus with self-diagnosis function as set forth in claim 1, wherein said modifying means produces the modified data by adding or subtracting said variation data to or from said correcting data.
4. A color television camera apparatus with self-diagnosis function as set forth in claim 1, wherein said arithmetic operating means, said modifying means, said calculating means and said judging means are a central processing unit of a microcomputer.
5. A color television camera apparatus with self-diagnosis function as set forth in claim 1, wherein said detecting means detects respective adjustment data corresponding to a plurality of the adjustment items and said supplying means supplies the corresponding vari-ation data to said respective adjustment data.
6. A color television camera apparatus with self-diagnosis function as set forth in any one of claims 1, 3 or 5 wherein said supplying means includes a read-only memory.
7. A color television camera apparatus with self-diagnosis function as set forth in claim 5, wherein said judging means performs judging operation one by one for all the judgement items.
8. A color television camera apparatus with self-diagnosis function as set forth in claim 1, wherein said video signal comprises red, blue and green video signals.
9. A color television camera apparatus with self-diagnosis function as set forth in claim 8, wherein said detecting means respectively detects adjustment data corresponding to a plurality of said adjustment items from each of said blue, red and green video signals, and said supplying means supplies the respective variation data corresponding to each of said adjustment data.
10. A color television camera apparatus with self-diagnosis function as set forth in claim 9, wherein each of the adjustment data detected from said green video signal is used as said reference data with which the corresponding adjustment data detected from the red video signal and the blue video signal are compared.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57209623A JPS59100685A (en) | 1982-11-30 | 1982-11-30 | Color television camera device |
| JP209623/1982 | 1982-11-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1203892A true CA1203892A (en) | 1986-04-29 |
Family
ID=16575856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000441094A Expired CA1203892A (en) | 1982-11-30 | 1983-11-14 | Color television camera apparatus with self-diagnosis function |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US4608593A (en) |
| JP (1) | JPS59100685A (en) |
| CA (1) | CA1203892A (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60219885A (en) * | 1984-04-16 | 1985-11-02 | Sony Corp | Automatic centering device of video camera |
| EP0323677A1 (en) * | 1988-01-07 | 1989-07-12 | Koninklijke Philips Electronics N.V. | Picture display device including a waveform generator |
| KR0181416B1 (en) * | 1991-01-29 | 1999-05-01 | 윤종용 | Gain control method and apparatus of video signal |
| JP3303308B2 (en) * | 1991-08-29 | 2002-07-22 | ソニー株式会社 | Video signal processing device |
| IL107835A (en) * | 1993-12-02 | 1996-07-23 | Genop Ltd | Method and system for testing the performance of a device for use with an electro-optical system |
| JPH099270A (en) * | 1995-06-23 | 1997-01-10 | Sony Corp | Video camera and video camera apparatus |
| US6190308B1 (en) * | 1995-08-17 | 2001-02-20 | Karl Storz Gmbh & Co., Kg | Endoscopic video system for correcting a video image of an object to be studied |
| JP3661817B2 (en) | 1996-09-03 | 2005-06-22 | ソニー株式会社 | Color correction apparatus, color correction control apparatus, and color correction system |
| JPH10285610A (en) * | 1997-04-01 | 1998-10-23 | Sony Corp | Color correction device and color correction controller |
| US7151560B2 (en) * | 2002-06-20 | 2006-12-19 | Hewlett-Packard Development Company, L.P. | Method and apparatus for producing calibration data for a digital camera |
| DE10253501A1 (en) * | 2002-11-16 | 2004-05-27 | Robert Bosch Gmbh | Car imaging system monitors functionality by comparing processor status interface output derived from pattern, signal or sensor comparison with threshold |
| US20050122406A1 (en) * | 2003-12-09 | 2005-06-09 | Voss James S. | Digital camera system and method having autocalibrated playback viewing performance |
| CA2472871C (en) * | 2004-02-18 | 2011-10-25 | Inter-Cite Video Inc. | System and method for the automated, remote diagnostic of the operation of a digital video recording network |
| JP5139374B2 (en) * | 2009-06-19 | 2013-02-06 | 株式会社日立国際電気 | Television camera device control system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55135483A (en) * | 1979-04-09 | 1980-10-22 | Toshiba Corp | Color television camera device |
| JPS55145493A (en) * | 1979-04-27 | 1980-11-13 | Toshiba Corp | Color television camera device |
| JPS57124984A (en) * | 1981-01-28 | 1982-08-04 | Hitachi Ltd | Color image pickup device |
-
1982
- 1982-11-30 JP JP57209623A patent/JPS59100685A/en active Granted
-
1983
- 1983-11-09 US US06/550,044 patent/US4608593A/en not_active Expired - Lifetime
- 1983-11-14 CA CA000441094A patent/CA1203892A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59100685A (en) | 1984-06-09 |
| JPH0145796B2 (en) | 1989-10-04 |
| US4608593A (en) | 1986-08-26 |
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| MKEX | Expiry |