CA1150859A - Device for differential image determination - Google Patents
Device for differential image determinationInfo
- Publication number
- CA1150859A CA1150859A CA000355926A CA355926A CA1150859A CA 1150859 A CA1150859 A CA 1150859A CA 000355926 A CA000355926 A CA 000355926A CA 355926 A CA355926 A CA 355926A CA 1150859 A CA1150859 A CA 1150859A
- Authority
- CA
- Canada
- Prior art keywords
- input
- memory
- multiplier
- adder
- output
- 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
Links
- 230000015654 memory Effects 0.000 claims abstract description 55
- 238000012545 processing Methods 0.000 claims abstract description 7
- 230000006870 function Effects 0.000 claims description 3
- 229910052729 chemical element Inorganic materials 0.000 claims 1
- 230000010354 integration Effects 0.000 abstract 1
- 230000010365 information processing Effects 0.000 description 11
- 101150042711 adc2 gene Proteins 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000005855 radiation Effects 0.000 description 3
- 101100067427 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) FUS3 gene Proteins 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006399 behavior Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/30—Transforming light or analogous information into electric information
- H04N5/32—Transforming X-rays
- H04N5/3205—Transforming X-rays using subtraction imaging techniques
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
- G06T5/50—Image enhancement or restoration by the use of more than one image, e.g. averaging, subtraction
Abstract
ABSTRACT:
"A device for differential image determination."
The invention relates to real-time (X-ray image) signal processing with which it is necessary to have only one memory with a capacity for one X-ray image. Via an X-ray image intensifier-TV chain consecutive X-ray images are sequentially fed in digital form to a recursive filter.
The memory is employed in the recursive filter as a "delay element", as result of which a. noise integration and b. differential image determination between consecutive images take place.
"A device for differential image determination."
The invention relates to real-time (X-ray image) signal processing with which it is necessary to have only one memory with a capacity for one X-ray image. Via an X-ray image intensifier-TV chain consecutive X-ray images are sequentially fed in digital form to a recursive filter.
The memory is employed in the recursive filter as a "delay element", as result of which a. noise integration and b. differential image determination between consecutive images take place.
Description
~150859 PHN 9538 l 9-6-1980 "A device for differential image determination."
The invention relates to a device for processing images with an image forming set-up for producing images which are split up into elements, a memory for the storage of image information per element, a subtraction circuit for the subtraction of image information from each image element of previously determined image information in the corresponding image element and a playback device for reproducing the information from each image element determined via the subtraction circuit.
Such a medical examination device has already been proposed in a paper by R.A. Kruger et al. published in the bimonthly journal "Optical Engineering", Vol. 17, No. 6, November/December 1978, pp. 652-657. In the exa-mination device a fluoroscopic image is converted via an image intensifier - image pick-up chain into a video-signal which is then digitized. Subsequently the digitized image is stored in one of three video-memories. Each video-memory must have the capacity to hold summed image in-formation emanating from a number of fluoroscopic images.
20 The function of the three video-memories changes cyclically.
From two memories a weighted image is determined which re-produces with emphasis the differences between the conse-cutive images stored in the two memories. An image infor-mation processing method such as this is termed time-25 interval differential imaging by the authors of the paper.
Whilst the differences in the two memories are being deter-mined, the third memory is regenerated. For this reason the device described in the paper contains three video-memories, which makes it expensive.
The aim o~ the invention is to provide an exa-mination device which is considerably cheaper but capable of processing the same image information.
The examination device according to the invention ~`
1~50859 is characterized in that with at least the subtraction cir-cuit, the memory, a multiplication circuit and an addition circuit form a recursive filter; the addition circuit has a first input for feeding in image information per element of an image and a second input for feeding in previously determined image information which is stored in the memory, to which end an output of the memory is connected to the second input of the addition circuit in such a way that a signal is fed to an input of the memory, which signal is the sum of the information originating from the image mul-tiplied by ~ ) and the information originating from the memory multiplied by (1- a), in which S ~ ~ 1, and the subtraction circuit being connected on the one hand to the output of the memory and, on the other, to the input of the recursive filter.
Because the invention uses the video-memory as part of a recursive filter, only one memory space is re-quired for a video-image; this represents a saving and is therefore of advantage.
A preferred design of an examination device in accordance with the invention is characterized by the fact that the recursive filter contains one multiplication circuit of which an input is connected to an input of the subtraction circuit, of which latter an input is coupled 25 to an input of the addition circuit of which an output is connected to an input of the memory and a further input of the addition circuit is connected with the output of the memory.
This preferred design form has the advantage 30 that the processing of the video-information can be matched - to different examination situations with only one parameter (the multiplication factor of the only multiplier); it is therefore very flexible.
It should be noted that in the publication men-35 tioned, an addition circuit is also provided per video-memory, to which the output of the video-memory is fed back. The purpose of the feedback is, however, to summate image information for each image element from different 1~5U859 sequential video-images with the object of improving the signal-to-noise ratio.
The addition circuit in the examination device according to the invention forms part of the recursive s filter and has a different function.
The invention will be explained on the basis of an example given in diagrammatic form in which:
Fig. 1 shows in a block diagram how image infor-mation is processed in accordance with the state of the art, Fig. 2 shows an examination device designed in accordance with the invention and Fig. 3 shows a preferred design of the image information processing part of an examination device de-signed in accordance with the invention.
Fig. 1 shows a block diagram of an image process-ing device designed according to the state of the art; in it use is made of three parallel-connected memory chains.
Each chain comprises a primary adder Ai (i = 1, 2 or 3), a memory MM. The outputs of the multiplier Mi are all 20 connected to an summing device A4. In the three memories from MM1 to MM3, sequentially digitized X-ray images are stored. Thus it is possible to summate a number of directly consecutive X-ray imagss per memory MM1 to MM3. For this one output from each memory MM1 is connected in feedback 25 via the primary adder Ai to theinput of the memory MM1.
The purpose of the feedback is to improve the signal-to-noise ratio of the stored image information. To which ; memory chain the digitized information Iin is fed depends on the signal inputs Ei along which the adders Ai are 30 blockable.
The output of a memory MMi (that is e.g. a ran-domly accessible memory (RAM)) is connected to the adder A1i. Via an input Ci of the adder A1i a con9tant ei (at free choice) is to be counted with the information obtained 35 from the memory MM1. The sum of the memory information Ii and the added constant ei are fed to the multiplier Mi in which the sum formed with a freely chosen constant factor ki in the adder A1i ~ added via input Ki ~ is multiplied.
~1508S9 PHN 9~38 4 9-6-1980 The products formed in the multiplier Mi are fed to the summing device A4. The output Im of the summing device A~
then feeds the value I = ~ k. (I. ~ c ) m ~
i=l With the procedure described in the preceding it is possible for example to generate time-depe~dent differen-tial X-ray images with, e.g. the difference being repro-10 duced between the X-ray images (k1 = ~1; k2 = +1; k3 = 0;
cl = c2 = O) stored in the memories MMl and MM2 while a third X-ray image is read into memory MM3. A disadvantage of the set-up described for this purpose is the multiple memory space MMl 2 3.
An examination device as described in Fig. 2 and designed according to the invention has the advantage that only one memory space MM20 is needed (the memory capacity of MM20 is equal to that of the separate memories MMl 2 3)-The examination device shown in Fig. 2 contains an H.T.
20 source G for supplying the X-ray tube B. An object O is irradiated with the radiation X generated by the X-ray tube B~ and a shadow image of object O is formed on the input screen of the image intensifier II. The shadow image, inten-sified and reduced in size, is converted into an analog 25 video-signal via a camera tube PU connected to the output screen of the image intensifier II. An amplifier OA with a sampling circuit intensifies and samples this video-signal; subsequently the sampled signal is converted into digital form via an analog-digital converter ADC2.
The digitized signal is fed to an image infor-- mation processor comprising the following component parts:
multipliers M20 and M21, an adder A20, a memory MM20 and a subtraction circuit V20. Furthermore, the examination device shown in Fig. 2 contains a digital-analog converter 35 DAC2 and a display device (e.g. a T~ monitor) MON. The examination device can, of course, contain a magnetic tape recorder, a recorder for video or digital signals or a copier/printer for the more permanent registration Or ~15t~859 the processed X-ray images.
The image information processing part forms a recursive filter and works as follows: from one image element a value originating from the analog-digital con-verter ADC2 is fed to the multiplier Mzo; there the valueis multiplied by the value ~ (O ~ ~ ~1) which has likewise been fed to the multiplier M20. The product is fed to the adder A20 to which the value for the same image elemen~
already stored in the memory MM20 is also fed after it 10 has been multiplied by a factor (1 - ~). The multiplication is performed by a multiplier M21 which links the output of the memory MM20 with an output of the adder A20. The sum of the two values fed to the adder A20 is stored at the address appertaining to the image element. The value originating from the analog-digital converter ADC2 and also the value stored in the memory MM20 are fed to the subtraction circuit V20, so that the difference between the two values is fed to the digital-analog converterDAC2 and displayed on the monitor MON.
Fig. 3 shows a preferred design form of an in-formation processillg component; for the sake of clarity an input of the analog-digital converter ADC2 and an out-put of the digital-analog converter DAC from Fig. 2 are shown connected. The processing component shown contains 25 only a subtraction circuit V30, a multiplier M30, an addition circuit or adder A30 and a memory MM30. The sub-traction circuit V30 is interposed between the analog-digital converter ADC2 and the digital-analog converter DAC2, the output of the subtraction circuit V30 then also 30 being connected to the multiplier M30 at which a freely selected factor (O ~ ~ ~1) i3 multiplied with an output signal of the multiplier circuit M30. The product of this circuit is fed to the adder A30 as is also a value re-quested at the output of the memory MM30 which is also 35 fed to the subtraction circuit V30. A sum generated by the adder A30 is again fed to the memory MM30-The image information processing parts shown inFigs. 2 and 3 and belonging to an examination device de-~15(;)859 signed according to the invention both have the same filter behaviour.
Information processing according to the preferred design example shown in Fig. 3 is very flexible, as the information processing can be adapted to different exa-mination situations (e.g. flow-rate of contract medium) by changing only one parameter (~ ). By making a correct choice of (0~) the same delay occurs as with image infor-mation processing according to Fig. 1.
The examples shown in Figs. 2 and 3 of designs of information processing units have so far always been based on digital technique. If analog memories are em-ployed for the memories MM20 30~ such as charge-coupled information carriers (CTD, PCCD), the information process-ing can be performed with full analog technique, so that operational amplifiers can be used for the subtraction 22' 30~ the adder A20 A30 and the multipliers M20, M21 and M30. If charge-coupled information carriers are used as video-memories and similar techniques are 20 employed for picking up and converting the X-ray image generated on the output screen of the image intensifier into a "video signal" (instead of a camera tube), it will be found advantageous to synchronize the "reading out" of the image pick-up of theimage intensifier and the "shift-25 ing" of the charge in the video-memory of the recursive filter.
Besides being employed in the X-ray examination devices shown in Fig. 2, the image information processing - unit can also be used in other examination devices employ-30 ing other penetrating radiations such as infra-red, nuclear - and ultrasonic radiation. Furthermore, the image informa-tion processing unit can be used in a closed circuit TV
system for observation or security purposes,since a change in the image information would be displayed in emphasized 35 form on the monitor connected to the closed system.
The invention relates to a device for processing images with an image forming set-up for producing images which are split up into elements, a memory for the storage of image information per element, a subtraction circuit for the subtraction of image information from each image element of previously determined image information in the corresponding image element and a playback device for reproducing the information from each image element determined via the subtraction circuit.
Such a medical examination device has already been proposed in a paper by R.A. Kruger et al. published in the bimonthly journal "Optical Engineering", Vol. 17, No. 6, November/December 1978, pp. 652-657. In the exa-mination device a fluoroscopic image is converted via an image intensifier - image pick-up chain into a video-signal which is then digitized. Subsequently the digitized image is stored in one of three video-memories. Each video-memory must have the capacity to hold summed image in-formation emanating from a number of fluoroscopic images.
20 The function of the three video-memories changes cyclically.
From two memories a weighted image is determined which re-produces with emphasis the differences between the conse-cutive images stored in the two memories. An image infor-mation processing method such as this is termed time-25 interval differential imaging by the authors of the paper.
Whilst the differences in the two memories are being deter-mined, the third memory is regenerated. For this reason the device described in the paper contains three video-memories, which makes it expensive.
The aim o~ the invention is to provide an exa-mination device which is considerably cheaper but capable of processing the same image information.
The examination device according to the invention ~`
1~50859 is characterized in that with at least the subtraction cir-cuit, the memory, a multiplication circuit and an addition circuit form a recursive filter; the addition circuit has a first input for feeding in image information per element of an image and a second input for feeding in previously determined image information which is stored in the memory, to which end an output of the memory is connected to the second input of the addition circuit in such a way that a signal is fed to an input of the memory, which signal is the sum of the information originating from the image mul-tiplied by ~ ) and the information originating from the memory multiplied by (1- a), in which S ~ ~ 1, and the subtraction circuit being connected on the one hand to the output of the memory and, on the other, to the input of the recursive filter.
Because the invention uses the video-memory as part of a recursive filter, only one memory space is re-quired for a video-image; this represents a saving and is therefore of advantage.
A preferred design of an examination device in accordance with the invention is characterized by the fact that the recursive filter contains one multiplication circuit of which an input is connected to an input of the subtraction circuit, of which latter an input is coupled 25 to an input of the addition circuit of which an output is connected to an input of the memory and a further input of the addition circuit is connected with the output of the memory.
This preferred design form has the advantage 30 that the processing of the video-information can be matched - to different examination situations with only one parameter (the multiplication factor of the only multiplier); it is therefore very flexible.
It should be noted that in the publication men-35 tioned, an addition circuit is also provided per video-memory, to which the output of the video-memory is fed back. The purpose of the feedback is, however, to summate image information for each image element from different 1~5U859 sequential video-images with the object of improving the signal-to-noise ratio.
The addition circuit in the examination device according to the invention forms part of the recursive s filter and has a different function.
The invention will be explained on the basis of an example given in diagrammatic form in which:
Fig. 1 shows in a block diagram how image infor-mation is processed in accordance with the state of the art, Fig. 2 shows an examination device designed in accordance with the invention and Fig. 3 shows a preferred design of the image information processing part of an examination device de-signed in accordance with the invention.
Fig. 1 shows a block diagram of an image process-ing device designed according to the state of the art; in it use is made of three parallel-connected memory chains.
Each chain comprises a primary adder Ai (i = 1, 2 or 3), a memory MM. The outputs of the multiplier Mi are all 20 connected to an summing device A4. In the three memories from MM1 to MM3, sequentially digitized X-ray images are stored. Thus it is possible to summate a number of directly consecutive X-ray imagss per memory MM1 to MM3. For this one output from each memory MM1 is connected in feedback 25 via the primary adder Ai to theinput of the memory MM1.
The purpose of the feedback is to improve the signal-to-noise ratio of the stored image information. To which ; memory chain the digitized information Iin is fed depends on the signal inputs Ei along which the adders Ai are 30 blockable.
The output of a memory MMi (that is e.g. a ran-domly accessible memory (RAM)) is connected to the adder A1i. Via an input Ci of the adder A1i a con9tant ei (at free choice) is to be counted with the information obtained 35 from the memory MM1. The sum of the memory information Ii and the added constant ei are fed to the multiplier Mi in which the sum formed with a freely chosen constant factor ki in the adder A1i ~ added via input Ki ~ is multiplied.
~1508S9 PHN 9~38 4 9-6-1980 The products formed in the multiplier Mi are fed to the summing device A4. The output Im of the summing device A~
then feeds the value I = ~ k. (I. ~ c ) m ~
i=l With the procedure described in the preceding it is possible for example to generate time-depe~dent differen-tial X-ray images with, e.g. the difference being repro-10 duced between the X-ray images (k1 = ~1; k2 = +1; k3 = 0;
cl = c2 = O) stored in the memories MMl and MM2 while a third X-ray image is read into memory MM3. A disadvantage of the set-up described for this purpose is the multiple memory space MMl 2 3.
An examination device as described in Fig. 2 and designed according to the invention has the advantage that only one memory space MM20 is needed (the memory capacity of MM20 is equal to that of the separate memories MMl 2 3)-The examination device shown in Fig. 2 contains an H.T.
20 source G for supplying the X-ray tube B. An object O is irradiated with the radiation X generated by the X-ray tube B~ and a shadow image of object O is formed on the input screen of the image intensifier II. The shadow image, inten-sified and reduced in size, is converted into an analog 25 video-signal via a camera tube PU connected to the output screen of the image intensifier II. An amplifier OA with a sampling circuit intensifies and samples this video-signal; subsequently the sampled signal is converted into digital form via an analog-digital converter ADC2.
The digitized signal is fed to an image infor-- mation processor comprising the following component parts:
multipliers M20 and M21, an adder A20, a memory MM20 and a subtraction circuit V20. Furthermore, the examination device shown in Fig. 2 contains a digital-analog converter 35 DAC2 and a display device (e.g. a T~ monitor) MON. The examination device can, of course, contain a magnetic tape recorder, a recorder for video or digital signals or a copier/printer for the more permanent registration Or ~15t~859 the processed X-ray images.
The image information processing part forms a recursive filter and works as follows: from one image element a value originating from the analog-digital con-verter ADC2 is fed to the multiplier Mzo; there the valueis multiplied by the value ~ (O ~ ~ ~1) which has likewise been fed to the multiplier M20. The product is fed to the adder A20 to which the value for the same image elemen~
already stored in the memory MM20 is also fed after it 10 has been multiplied by a factor (1 - ~). The multiplication is performed by a multiplier M21 which links the output of the memory MM20 with an output of the adder A20. The sum of the two values fed to the adder A20 is stored at the address appertaining to the image element. The value originating from the analog-digital converter ADC2 and also the value stored in the memory MM20 are fed to the subtraction circuit V20, so that the difference between the two values is fed to the digital-analog converterDAC2 and displayed on the monitor MON.
Fig. 3 shows a preferred design form of an in-formation processillg component; for the sake of clarity an input of the analog-digital converter ADC2 and an out-put of the digital-analog converter DAC from Fig. 2 are shown connected. The processing component shown contains 25 only a subtraction circuit V30, a multiplier M30, an addition circuit or adder A30 and a memory MM30. The sub-traction circuit V30 is interposed between the analog-digital converter ADC2 and the digital-analog converter DAC2, the output of the subtraction circuit V30 then also 30 being connected to the multiplier M30 at which a freely selected factor (O ~ ~ ~1) i3 multiplied with an output signal of the multiplier circuit M30. The product of this circuit is fed to the adder A30 as is also a value re-quested at the output of the memory MM30 which is also 35 fed to the subtraction circuit V30. A sum generated by the adder A30 is again fed to the memory MM30-The image information processing parts shown inFigs. 2 and 3 and belonging to an examination device de-~15(;)859 signed according to the invention both have the same filter behaviour.
Information processing according to the preferred design example shown in Fig. 3 is very flexible, as the information processing can be adapted to different exa-mination situations (e.g. flow-rate of contract medium) by changing only one parameter (~ ). By making a correct choice of (0~) the same delay occurs as with image infor-mation processing according to Fig. 1.
The examples shown in Figs. 2 and 3 of designs of information processing units have so far always been based on digital technique. If analog memories are em-ployed for the memories MM20 30~ such as charge-coupled information carriers (CTD, PCCD), the information process-ing can be performed with full analog technique, so that operational amplifiers can be used for the subtraction 22' 30~ the adder A20 A30 and the multipliers M20, M21 and M30. If charge-coupled information carriers are used as video-memories and similar techniques are 20 employed for picking up and converting the X-ray image generated on the output screen of the image intensifier into a "video signal" (instead of a camera tube), it will be found advantageous to synchronize the "reading out" of the image pick-up of theimage intensifier and the "shift-25 ing" of the charge in the video-memory of the recursive filter.
Besides being employed in the X-ray examination devices shown in Fig. 2, the image information processing - unit can also be used in other examination devices employ-30 ing other penetrating radiations such as infra-red, nuclear - and ultrasonic radiation. Furthermore, the image informa-tion processing unit can be used in a closed circuit TV
system for observation or security purposes,since a change in the image information would be displayed in emphasized 35 form on the monitor connected to the closed system.
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a device for processing images which have been separated into image elements of the type which com-prises a memory for storing the image elements and sub-traction means for subtracting corresponding image ele-ments in a current image from those in a previously deter-mined image; the improvement comprising:
multiplying and addition circuits connected at least with the memory to form recursive filter means which function to multiply information received from the current image by a factor .alpha. , to multiply image infor-mation received from an output of the memory by a factor (1- .alpha.), where 0 ? .alpha. ? 1, to add the resulting products on an elemental basis, and to supply the resulting sum to an input of the memory.
multiplying and addition circuits connected at least with the memory to form recursive filter means which function to multiply information received from the current image by a factor .alpha. , to multiply image infor-mation received from an output of the memory by a factor (1- .alpha.), where 0 ? .alpha. ? 1, to add the resulting products on an elemental basis, and to supply the resulting sum to an input of the memory.
2. The improvement of claim 1 wherein the recursive filter means comprise:
a first multiplier circuit;
a second multiplier circuit;
an adder; and the memory;
the current image information being supplied to a first input of the first multiplier, the constant of being supplied to a second input of the first multiplier, an output of the first multiplier being connected to a first input of the adder, an output of the adder being connected to the input of the memory, a first input of the second multiplier being connected to the output of the memory, a second input of the second multiplier being con-nected to receive the constant (1 - .alpha.), an output of the second multiplier being connected to a second input of the adder, and wherein one input of the subtraction means is connected to receive the current image information and a second input of the subtraction means is connected to the output of the memory.
a first multiplier circuit;
a second multiplier circuit;
an adder; and the memory;
the current image information being supplied to a first input of the first multiplier, the constant of being supplied to a second input of the first multiplier, an output of the first multiplier being connected to a first input of the adder, an output of the adder being connected to the input of the memory, a first input of the second multiplier being connected to the output of the memory, a second input of the second multiplier being con-nected to receive the constant (1 - .alpha.), an output of the second multiplier being connected to a second input of the adder, and wherein one input of the subtraction means is connected to receive the current image information and a second input of the subtraction means is connected to the output of the memory.
3. The improvement of claim 1 wherein the recursive filter means comprise:
the subtraction means;
a multiplier, and an adder;
a first input of the subtraction means being connected to receive the current image information, a first input of the multiplier being connected to an out-put of the subtraction means, a second input of the multi-plier being connected to receive the factor .alpha. , a first input of the adder being connected to the output of the multiplier, an output of the adder being connected to an input of the memory, and the output of the memory being connected both to a second input of the subtraction means and to a second input of the adder.
the subtraction means;
a multiplier, and an adder;
a first input of the subtraction means being connected to receive the current image information, a first input of the multiplier being connected to an out-put of the subtraction means, a second input of the multi-plier being connected to receive the factor .alpha. , a first input of the adder being connected to the output of the multiplier, an output of the adder being connected to an input of the memory, and the output of the memory being connected both to a second input of the subtraction means and to a second input of the adder.
4. The improvement of claim 2 or 3 wherein the memory is a digital memory and the adder, subtraction means, and multipliers comprise digital circuits.
5. Device in accordance with claim 1, 2 or 3, char-acterized in that the subtraction, addition and multiply-ing circuits are operational amplifiers and that the memory contains charge-coupled shift registers (CTD, PCCD).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NLAANVRAGE7905611,A NL184298C (en) | 1979-07-19 | 1979-07-19 | DEVICE FOR DIFFERENCE IMAGE DETERMINATION. |
| NL7905611 | 1979-07-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1150859A true CA1150859A (en) | 1983-07-26 |
Family
ID=19833564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000355926A Expired CA1150859A (en) | 1979-07-19 | 1980-07-10 | Device for differential image determination |
Country Status (9)
| Country | Link |
|---|---|
| US (2) | US4350998A (en) |
| JP (1) | JPS5622163A (en) |
| BE (1) | BE884362A (en) |
| CA (1) | CA1150859A (en) |
| DE (1) | DE3026897C2 (en) |
| FR (1) | FR2461960A1 (en) |
| GB (1) | GB2057221B (en) |
| NL (1) | NL184298C (en) |
| SE (1) | SE441963B (en) |
Families Citing this family (44)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL184298C (en) * | 1979-07-19 | 1989-06-01 | Philips Nv | DEVICE FOR DIFFERENCE IMAGE DETERMINATION. |
| EP0037722A1 (en) * | 1980-04-08 | 1981-10-14 | Technicare Corporation | Dynamic image enhancement method and apparatus therefor |
| US4335427A (en) * | 1980-04-21 | 1982-06-15 | Technicare Corporation | Method of selecting a preferred difference image |
| DE3111728A1 (en) * | 1981-03-25 | 1982-10-07 | Philips Patentverwaltung Gmbh, 2000 Hamburg | "TESTING PROCEDURE FOR WORKPIECES" |
| US4445226A (en) * | 1981-05-05 | 1984-04-24 | The Board Of Trustees Of The Leland Stanford Junior University | Multiple-energy X-ray subtraction imaging system |
| US4396903A (en) * | 1981-05-29 | 1983-08-02 | Westinghouse Electric Corp. | Electro-optical system for correlating and integrating image data from frame-to-frame |
| US4393402A (en) * | 1981-06-08 | 1983-07-12 | General Electric Company | Subtraction fluoroscopy method and apparatus |
| US4430749A (en) * | 1981-06-30 | 1984-02-07 | Siemens Gammasonics, Inc. | Medical imaging apparatus and method for furnishing difference images |
| US4450478A (en) * | 1981-09-09 | 1984-05-22 | Georgetown University | Digital fluorographic method and system |
| DE3149483A1 (en) * | 1981-12-14 | 1983-06-23 | Siemens AG, 1000 Berlin und 8000 München | X-RAY DIAGNOSTIC DEVICE FOR CREATING SUBTRACTION IMAGES |
| US4436095A (en) * | 1981-12-22 | 1984-03-13 | Thomson-Csf Broadcast, Inc. | Method and apparatus for imaging a body |
| US4677478A (en) * | 1982-01-25 | 1987-06-30 | Thomson-Csf Broadcast, Inc. | Apparatus and method for imaging a body |
| US4504908A (en) * | 1982-03-15 | 1985-03-12 | General Electric Company | Matched filter for X-ray temporal subtraction |
| JPS58163338A (en) * | 1982-03-20 | 1983-09-28 | 富士写真フイルム株式会社 | Subtraction treatment of radioactive image |
| DE89665T1 (en) * | 1982-03-20 | 1984-05-10 | Fuji Photo Film Co., Ltd., Minami Ashigara, Kanagawa | SYSTEM AND ARRANGEMENT FOR SUBTRACTING X-RAY IMAGES. |
| NL8202450A (en) * | 1982-06-17 | 1984-01-16 | Philips Nv | METHOD AND APPARATUS FOR PROCESSING ROENTGEN IMAGES. |
| US4792854A (en) * | 1982-09-14 | 1988-12-20 | New York Institute Of Technology | Apparatus for temporally processing a video signal |
| US4538236A (en) * | 1982-09-24 | 1985-08-27 | Rca Corporation | Adaptive digital signal coring circuit |
| EP0106265B2 (en) * | 1982-10-07 | 1992-08-26 | Kabushiki Kaisha Toshiba | Image data processing apparatus |
| JPS5983486A (en) * | 1982-11-04 | 1984-05-14 | Fuji Photo Film Co Ltd | Energy subtraction method of radiant ray picture and storable fluorescent sheet, storable fluorescent sheet laminate and storable fluorescent sheet filter laminate used for its method |
| US4542459A (en) * | 1982-11-26 | 1985-09-17 | General Electric Company | Matched filter for x-ray hybrid subtraction |
| JPS59103648A (en) * | 1982-12-06 | 1984-06-15 | 株式会社東芝 | X-ray photographing apparatus |
| US4598368A (en) * | 1982-12-27 | 1986-07-01 | Tokyo Shibaura Denki Kabushiki Kaisha | Superposed image display device |
| GB8310239D0 (en) * | 1983-04-15 | 1983-05-18 | Micro Consultants Ltd | Image processing system |
| JPS607292A (en) * | 1983-06-27 | 1985-01-16 | Toshiba Corp | Stereoscopic x-ray television device |
| US4783751A (en) * | 1983-08-17 | 1988-11-08 | University Of South Carolina | Analysis of pore complexes |
| DE3341215A1 (en) * | 1983-11-14 | 1985-05-30 | Siemens AG, 1000 Berlin und 8000 München | ROENTGENSTEREO SUBTRACTION DEVICE |
| JPS60234643A (en) * | 1984-05-09 | 1985-11-21 | 富士写真フイルム株式会社 | Radiation image information regeneration method and apparatus |
| JPS60234642A (en) * | 1984-05-09 | 1985-11-21 | 富士写真フイルム株式会社 | Radiation image information regeneration method and apparatus |
| US4636850A (en) * | 1984-09-07 | 1987-01-13 | Adac Laboratories, Inc. | Apparatus and method for enhancement of video images |
| US4663666A (en) * | 1985-01-23 | 1987-05-05 | Vsp, Inc. | Camera output data correction apparatus |
| NL8503118A (en) * | 1985-11-13 | 1987-06-01 | Philips Nv | SURGICAL DEVICE WITH SUB-ADD IMAGES. |
| US4825388A (en) * | 1986-04-01 | 1989-04-25 | Princeton Gamma Tech., Inc. | Apparatus and method for processing digital images |
| US4785818A (en) * | 1986-06-30 | 1988-11-22 | General Electric Company | Method and means or dynamically weighted temporal averaging of pixel data |
| FR2604048B1 (en) * | 1986-09-12 | 1989-06-09 | Thomson Cgr | RADIOLOGY SYSTEM WITH A TELEVISION CAMERA HAVING A LOW-VIEW RETENTION ELEMENT |
| JPS63125241A (en) * | 1986-11-14 | 1988-05-28 | 株式会社東芝 | Image processor |
| DE3826550C2 (en) * | 1987-08-07 | 1994-01-13 | Toshiba Kawasaki Kk | Device for displaying X-ray images |
| US5949916A (en) * | 1997-06-23 | 1999-09-07 | Samsung Electronics Co., Ltd. | Modified automatic regressive filter and filtering method therefor |
| US7123008B1 (en) | 2002-04-19 | 2006-10-17 | Fonar Corporation | Positional magnetic resonance imaging |
| US8036730B1 (en) | 2002-04-19 | 2011-10-11 | Fonar Corporation | Temporal magnetic resonance imaging |
| JP2006334085A (en) * | 2005-06-01 | 2006-12-14 | Shimadzu Corp | Radiation imaging device, and radiation detecting signal processing method |
| JP4917916B2 (en) * | 2007-02-28 | 2012-04-18 | 株式会社 相沢鐵工 | Brake device for transport vehicle and transport vehicle with brake device |
| ATE458231T1 (en) * | 2007-07-08 | 2010-03-15 | Univ Liege | VISUAL BACKGROUND EXTRACTOR |
| JP2012110466A (en) * | 2010-11-24 | 2012-06-14 | Canon Inc | X-ray fluoroscopic apparatus, method and program |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2521796C3 (en) * | 1975-05-16 | 1979-12-13 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Arrangement for determining the spatial distribution of the absorption or emission of radiation in a plane of a body |
| US4228465A (en) * | 1978-12-26 | 1980-10-14 | General Electric Company | Analog video convolver for real time two-dimensional image processing |
| NL184298C (en) * | 1979-07-19 | 1989-06-01 | Philips Nv | DEVICE FOR DIFFERENCE IMAGE DETERMINATION. |
-
1979
- 1979-07-19 NL NLAANVRAGE7905611,A patent/NL184298C/en not_active IP Right Cessation
-
1980
- 1980-07-02 US US06/165,174 patent/US4350998A/en not_active Expired - Lifetime
- 1980-07-10 CA CA000355926A patent/CA1150859A/en not_active Expired
- 1980-07-16 SE SE8005181A patent/SE441963B/en not_active IP Right Cessation
- 1980-07-16 DE DE3026897A patent/DE3026897C2/en not_active Expired
- 1980-07-16 GB GB8023314A patent/GB2057221B/en not_active Expired
- 1980-07-17 BE BE0/201445A patent/BE884362A/en unknown
- 1980-07-18 JP JP9862080A patent/JPS5622163A/en active Granted
- 1980-07-18 FR FR8015897A patent/FR2461960A1/en active Granted
-
1982
- 1982-01-25 US US06/342,330 patent/US4394684A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| FR2461960B1 (en) | 1984-06-08 |
| JPS6112312B2 (en) | 1986-04-07 |
| US4394684A (en) | 1983-07-19 |
| NL7905611A (en) | 1981-01-21 |
| FR2461960A1 (en) | 1981-02-06 |
| JPS5622163A (en) | 1981-03-02 |
| NL184298B (en) | 1989-01-02 |
| US4350998A (en) | 1982-09-21 |
| NL184298C (en) | 1989-06-01 |
| DE3026897A1 (en) | 1981-02-19 |
| SE8005181L (en) | 1981-01-20 |
| GB2057221A (en) | 1981-03-25 |
| DE3026897C2 (en) | 1983-09-08 |
| SE441963B (en) | 1985-11-18 |
| GB2057221B (en) | 1983-07-27 |
| BE884362A (en) | 1981-01-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1150859A (en) | Device for differential image determination | |
| US4636850A (en) | Apparatus and method for enhancement of video images | |
| JPH04505725A (en) | Detection device | |
| JPH04280586A (en) | Film-video signal conversion device | |
| Frost et al. | A digital video acquisition system for extraction of subvisual information in diagnostic medical imaging | |
| US5365277A (en) | Apparatus with reduction/magnification image size processing for producing low-pass filtered images | |
| US3751586A (en) | Circuit system for compensating the influence of the back-ground radiation on the picture display in an infra-red camera | |
| Herrmann et al. | A TV system for image recording and processing in conventional transmission electron microscopy | |
| EP0079661B1 (en) | Device for generating differentially enhanced images | |
| EP0113433B1 (en) | X-ray image data processing apparatus | |
| Knickerbocker et al. | High Speed Video Data Acquisition System (VDAS) for HEP, Including Reference Frame Subtractor, Data Compactor and 16 Megabyte FIFO | |
| US5850357A (en) | Signal processing device | |
| JPH0732467B2 (en) | Shading correction device for infrared video camera | |
| US4577223A (en) | Synthetic d.c. restoration of a.c. coupled signals | |
| EP0763280B1 (en) | Signal processing device | |
| SU1737751A1 (en) | Digital aperture corrector | |
| SU809657A1 (en) | Device for suppressing noise in television signal | |
| US4829464A (en) | Arrangement for filtering a multiplexed video signal | |
| JP3508169B2 (en) | Signal processing device | |
| JPS61145972A (en) | X-ray diagnosis apparatus | |
| SU720800A1 (en) | Device for correcting video signal | |
| SU720814A1 (en) | Television monitoring device | |
| JP2842475B2 (en) | Digital X-ray equipment | |
| SU594599A1 (en) | Tv aperture corrector | |
| JPS63161796A (en) | Frequency converting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |