WO1989012941A1 - Procedure and means for producing a false colour picture - Google Patents

Procedure and means for producing a false colour picture Download PDF

Info

Publication number
WO1989012941A1
WO1989012941A1 PCT/FI1989/000118 FI8900118W WO8912941A1 WO 1989012941 A1 WO1989012941 A1 WO 1989012941A1 FI 8900118 W FI8900118 W FI 8900118W WO 8912941 A1 WO8912941 A1 WO 8912941A1
Authority
WO
WIPO (PCT)
Prior art keywords
red
near infra
signal
signals
light
Prior art date
Application number
PCT/FI1989/000118
Other languages
French (fr)
Inventor
Tuomas HÄME
Original Assignee
Valtion Teknillinen Tutkimuskeskus
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Valtion Teknillinen Tutkimuskeskus filed Critical Valtion Teknillinen Tutkimuskeskus
Priority to KR1019900700295A priority Critical patent/KR900702725A/en
Publication of WO1989012941A1 publication Critical patent/WO1989012941A1/en
Priority to DK288290A priority patent/DK288290A/en
Priority to NO90905287A priority patent/NO905287L/en

Links

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
    • H04N5/33—Transforming infrared radiation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/12—Bandpass or bandstop filters with adjustable bandwidth and fixed centre frequency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/10—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/10—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths
    • H04N23/11—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths for generating image signals from visible and infrared light wavelengths

Definitions

  • the present invention concerns a procedure as specified in the preamble of the independent claim, for producing a wrong colour picture.
  • the invention also concerns a means implementing said procedure for pro ⁇ ducing a wrong colour picture.
  • Semiconductor video cameras comprise a plural- ity of semiconductor detectors, usually silicon-based detectors, which have been arranged in linear array or in matrix array. These detectors are moreover mostly connected to operate as CCD detectors.
  • CCD detec ⁇ tors are sensitive both to visible light and to near infra-red rays, as shown in Fig. 1.
  • access of near infra-red radia ⁇ tion to the detectors is prevented by placing before the semiconductor detectors a filter cutting off near infra-red radiation.
  • the colours of the picture, blue, green and red are separated with second filters pro ⁇ vided in front of individual detectors in the array of detectors.
  • these colour-separating filters do not filter out near infra-red radiation, and for this reason double filters are required in the camera in order that it might operate as a conventional video camera.
  • the object of the invention is to disclose a novel procedure for producing wrong colour pictures, wherein video cameras known in themselves in the art are utilized, which most advantageously contain a plu ⁇ rality of semiconductor detectors, such as CCD detec ⁇ tors, having a sensitivity range in respect of wave ⁇ length extending into the near infra-red range.
  • a plu ⁇ rality of semiconductor detectors such as CCD detec ⁇ tors
  • sensitivity range in respect of wave ⁇ length extending into the near infra-red range.
  • Fig. 1 displays the sensitivity range of the CCD detec ⁇ tor commonly employed in semiconductor video cameras
  • Fig. 2 presents schematically a means according to the invention for producing a moving wrong colour picture.
  • the video camera 1 comprises in Fig. 2 a de- tector array 2 and optics 3 placed therebefore, with the aid of the latter an image being formed on the sur ⁇ face of the detector array 2.
  • a filter 4 cutting off blue light.
  • the cut-off wavelength of the fil- ter is advantageously 500 n .
  • the green light detectors G 1 both near infra-red radiation and green light
  • the red light detectors R* is admitted both near infra-red radiation and red light.
  • the signals representing the respective radiation combinations i.e., from the output repre ⁇ senting blue radiation, or the blue output B, a signal ir representing the intensity of near infra-red radia ⁇ tion, from the green output a a summed signal ir+g 5 representing the intensity of near infra-red radiation and green light, and similarly from the red output R a summed signal ir+r representing the intensity of near infra-red radiation and red light.
  • the camera 1 is connected to a subtractor 5.
  • the colour signals ir, ir+g, ir+r obtained through the camera outputs B, G, R are carried to the inputs Bla, Gla, Rla of the subtractor.
  • the signal ir containing near infra-red radiation is sub ⁇ tracted from the signal ir+g containing beam divider
  • the succession of the signals ir, g, r obtained from the outputs Bib, Gib, Rib of the subtrac ⁇ tor 5 is changed in the swapper so that from the out- 35 puts B2b, G2b, R2b of the swapper the signals g, r, ir are obtained, in this order.
  • the green g, red r and near infra-red ir signals are changed. respectively, to the blue b, green g and red r signal when the colour is related to the signal sequence in a normal video camera. This is equivalent to the tradi ⁇ tional wrong colour picture.
  • the wrong colour picture may be realized in the following way.
  • the signals ir, g ob ⁇ tained from the outputs Bib, Gib of the subtractor 5 after the subtracting operation are changed to become, respectively, the output signals g, ir on the outputs B2b and R2b of the swapper 6.
  • the green and near infra-red signals g, ir are changed to become, respectively, the blue and green signal b, g, while the red signal r is left unchanged, as related to the colour signal sequence in a normal video camera.
  • the swapper 6 is connected to an assembler 6.
  • the outputs B2b, G2b, R2b of the swapper 6 are connect- ed to the inputs B3a, G3a, R3a, respectively, of the assembler.
  • From the output S of the assembler 7 is ob ⁇ tained the combined, standard format video signal s , which may be carried e.g. to a monitor or to a suitable recording means.
  • the invention has been de ⁇ scribed in the first place with reference to one advan ⁇ tageous embodiment thereof, but it is obvious that the invention may be modified in numerous ways within the scope of the inventive idea defined by the claims fol- lowing below.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Color Television Image Signal Generators (AREA)

Abstract

The invention concerns a procedure and means for forming a wrong colour picture, in said procedure being utilized a video camera comprising advantageously a plurality of semiconductor detectors, having a sensitivity range in respect of wavelength extending into the near infra-red range. The invention is characterized in that before the semiconducto detector array (2) of the camera is placed a high-pass filter (4) cutting off blue light so that only near infra-red radiation has access to the blue light detectors (N'), both near infra-red radiation and green light have access to the green light detectors (G') and both near infra-red radiation and red light have access to the red light detectors (R'), whereby from the outputs (B, G, R) of the camera (1) or equivalent are obtained signals (ir, ir + g, ir + r) representing the respective combinations of radiation.

Description

PROCEDURE AND MEANS FOR PRODUCING AFALSE COLOUR PICTURE
The present invention concerns a procedure as specified in the preamble of the independent claim, for producing a wrong colour picture. The invention also concerns a means implementing said procedure for pro¬ ducing a wrong colour picture.
Semiconductor video cameras comprise a plural- ity of semiconductor detectors, usually silicon-based detectors, which have been arranged in linear array or in matrix array. These detectors are moreover mostly connected to operate as CCD detectors. Such CCD detec¬ tors are sensitive both to visible light and to near infra-red rays, as shown in Fig. 1. In common colour video cameras, however, access of near infra-red radia¬ tion to the detectors is prevented by placing before the semiconductor detectors a filter cutting off near infra-red radiation. The colours of the picture, blue, green and red, are separated with second filters pro¬ vided in front of individual detectors in the array of detectors. However, as a rule these colour-separating filters do not filter out near infra-red radiation, and for this reason double filters are required in the camera in order that it might operate as a conventional video camera.
The object of the invention is to disclose a novel procedure for producing wrong colour pictures, wherein video cameras known in themselves in the art are utilized, which most advantageously contain a plu¬ rality of semiconductor detectors, such as CCD detec¬ tors, having a sensitivity range in respect of wave¬ length extending into the near infra-red range. This is achieved with the aid of those features characteristic of the invention which are stated, regarding the proce¬ dure, in the independent claims and regarding the means, in Claim 4. Previous wrong colour (or colour-infra) video cameras are based on tube cameras. The drawback of tube cameras, compared with the present invention, is that they may suffer damage under strong light, that they are otherwise likely to break, and that they are ex¬ pensive. As far as the inventor is aware, available wrong colour video cameras are not fitted with shutters because attaching a shutter to a tube camera is rather more awkward than it is in the case of a CCD camera. The invention has been associated with a camera with shutter, which is a prerequisite for most of the embod¬ iments of the present invention.
With the aid of the procedure and means of the invention the drawbacks of the above-mentioned wrong colour picture producing methods can be avoided and the production of such pictures can be carried out in a way which is considerably more simple.
The invention is described in the following in detail with the aid of the attached drawings, wherein:- Fig. 1 displays the sensitivity range of the CCD detec¬ tor commonly employed in semiconductor video cameras; Fig. 2 presents schematically a means according to the invention for producing a moving wrong colour picture. The video camera 1 comprises in Fig. 2 a de- tector array 2 and optics 3 placed therebefore, with the aid of the latter an image being formed on the sur¬ face of the detector array 2. Before the detector array 2 is placed only a filter 4 cutting off blue light. At the high end thereof the cut-off wavelength of the fil- ter is advantageously 500 n . To the blue light detec¬ tors B' of the video cameras will then be admitted only near infra-red radiation, to the green light detectors G1, both near infra-red radiation and green light, and to the red light detectors R* is admitted both near infra-red radiation and red light.From the outputs B, G, R of the camera 1, or equivalent detector unit, are then obtained the signals representing the respective radiation combinations, i.e., from the output repre¬ senting blue radiation, or the blue output B, a signal ir representing the intensity of near infra-red radia¬ tion, from the green output a a summed signal ir+g 5 representing the intensity of near infra-red radiation and green light, and similarly from the red output R a summed signal ir+r representing the intensity of near infra-red radiation and red light.
The camera 1 is connected to a subtractor 5.
10. The colour signals ir, ir+g, ir+r obtained through the camera outputs B, G, R are carried to the inputs Bla, Gla, Rla of the subtractor. In the subtractor 5, the signal ir containing near infra-red radiation is sub¬ tracted from the signal ir+g containing beam divider
15 and green light and from the signal ir+r containing near infra-red radiation and red light. These processed signals ir, g, r are put out from the outputs Bib, Gib, Rib in corresponding order.
The signals ir, g, r obtained after the sub-
20 tracting operation just described are processed to ob¬ tain the desired wrong colour signal. This is most ad¬ vantageously implemented with the aid of a swapper 6. To the inputs B2a, G2a, R2a of this swapper are con¬ nected, respectively, the outputs Bib, Gib, Rib of the
25 subtractor 5. With the aid of the swapper 5 the input signals ir, g, r are swapped in such a way that the desired signals will appear at the outputs B2b, G2b, R2b.
The above-mentioned signal processing in the
30 swapper 6 may take place in one of two ways, which pro¬ duce wrong colour pictures of different appearance.
First, the succession of the signals ir, g, r obtained from the outputs Bib, Gib, Rib of the subtrac¬ tor 5 is changed in the swapper so that from the out- 35 puts B2b, G2b, R2b of the swapper the signals g, r, ir are obtained, in this order. In other words, the green g, red r and near infra-red ir signals are changed. respectively, to the blue b, green g and red r signal when the colour is related to the signal sequence in a normal video camera. This is equivalent to the tradi¬ tional wrong colour picture. Secondly, the wrong colour picture may be realized in the following way. The signals ir, g ob¬ tained from the outputs Bib, Gib of the subtractor 5 after the subtracting operation are changed to become, respectively, the output signals g, ir on the outputs B2b and R2b of the swapper 6. In other words, the green and near infra-red signals g, ir are changed to become, respectively, the blue and green signal b, g, while the red signal r is left unchanged, as related to the colour signal sequence in a normal video camera. In a wrong colour picture of this type the plant cover ap¬ pears green, whereas it is seen as reddish in a tradi¬ tional wrong colour picture.
The swapper 6 is connected to an assembler 6. The outputs B2b, G2b, R2b of the swapper 6 are connect- ed to the inputs B3a, G3a, R3a, respectively, of the assembler. From the output S of the assembler 7 is ob¬ tained the combined, standard format video signal s , which may be carried e.g. to a monitor or to a suitable recording means. In the foregoing the invention has been de¬ scribed in the first place with reference to one advan¬ tageous embodiment thereof, but it is obvious that the invention may be modified in numerous ways within the scope of the inventive idea defined by the claims fol- lowing below.

Claims

1. A procedure for forming a wrong colour picture, in said procedure a video camera being util¬ ized, which advantageously comprises a plurality of semiconductor detectors, such as CCD detectors, of which the sensitivity range regarding wavelength ex¬ tends into the near infra-red range, and in said proce¬ dure a high-pass filter being placed before the semi¬ conductor detectors, characterized in that - before the semiconductor detector array (2) is placed a high-pass filter (4) specifically cutting off blue light so that only near infra-red radiation has access to the blue light detectors (B'), both near infra-red radiation and green light has access to the green light detectors (G') and both near infra-red radiation and red light has access to the red light detectors (E1), whereby at the outputs (B, G, R) of the camera (1) or equivalent are obtained signals (ir, ir+g, ir+r) repre¬ senting the respective combinations of radiation; - from the signal, obtained from the camera (1), repre¬ senting the intensity of near infra-red radiation and green light (ir+g) and from that representing the in¬ tensity of near infra-red radiation and red light (ir+r) is subtracted the signal representing the inten- sity of near infra-red radiation (ir) , whereupon the output signals indicate, in respective order, the in¬ tensities of green and red light (g,r) and the inten¬ sity of near infra-red radiation (ir) ; - The order of succession of the signals (g,r,ir) is changed to obtain a combined wrong colour signal.
2. Procedure according to claim 1, character¬ ized in that the signals obtained after the subtracting operation which represent the intensity of green light, red light (R) and near infra-red radiation (ir) are changed to become, respectively, the blue (b) , green (g) and red (r) signal, as related to the succession of signals' in a normal video camera, and are assembled to constitute the desired, standard format video signal.
3. Procedure according to claim 1, character¬ ized in that the signals obtained after the subtracting operation which represent the intensity of green light (g) and near infra-red radiation (ir) are changed to become, respectively, the blue and green (g) signal, while the red (r) signal is kept unchanged, as related to the succession of signals in a normal video camera.
4. A means for forming a wrong colour pic- ture, comprising a video camera and a high-pass fil¬ ter, said video camera most advantageously comprising a plurality of semiconductor detectors, such as CCD de¬ tectors, and said high-pass filter being placed before said semiconductor detector array, characterized in that the apparatus comprises
- a high-pass filter specifically cutting off blue light;
- a subtractor (5) to the inputs (B, G, R) of which the colour signals (ir, ir+g, ir+r) obtained from the de- tectors (2) from the outputs (B, G, R) are conducted and in which from the signal (ir+g) containing near infra-red radiation and green light and from the signal (ir+r) containing near infra-red radiation and red light is subtracted the signal (ir) containing near infra-red radiation, and from the outputs (Blb,Glb,Rlb) of said subtractor the processed signals proper (ir,g,r) are fed out;
- a swapper (6) to the inputs (B2a,G2a,R2a) of which the outputs (Bla,Gla,Rla) of the subtractor (5) are connected and with the aid of which the incoming sig¬ nals are swapped so that on the outputs (B2b,G2b,R2b) of said swapper (4) there are the desired signals (g,r,ir; g,ir,r) ;
- an assembler (7) of which the inputs (B3a,G3a,R3a) are connected to the outputs (B2b,G2b,R2b) of the swap¬ per (6) and from the output (S) of which the desired combined, standard video signal (s) is obtained.
PCT/FI1989/000118 1988-06-16 1989-06-15 Procedure and means for producing a false colour picture WO1989012941A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1019900700295A KR900702725A (en) 1988-06-16 1989-06-15 Generation process and means of false color picture
DK288290A DK288290A (en) 1988-06-16 1990-12-04 PROCEDURE AND METHOD FOR MAKING A FALSE COLOR PICTURE
NO90905287A NO905287L (en) 1988-06-16 1990-12-06 PROCEDURE AND APPARATUS FOR THE PROCESSING OF A FALSE COLOR PICTURE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI882901A FI79641C (en) 1988-06-16 1988-06-16 FOERFARANDE OCH ANORDNING FOER PRODUCERING AV EN FELFAERGSBILD.
FI882901 1988-06-16

Publications (1)

Publication Number Publication Date
WO1989012941A1 true WO1989012941A1 (en) 1989-12-28

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Application Number Title Priority Date Filing Date
PCT/FI1989/000118 WO1989012941A1 (en) 1988-06-16 1989-06-15 Procedure and means for producing a false colour picture

Country Status (7)

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EP (1) EP0422059A1 (en)
KR (1) KR900702725A (en)
AU (1) AU3835489A (en)
DK (1) DK288290A (en)
FI (1) FI79641C (en)
HU (1) HUT55576A (en)
WO (1) WO1989012941A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993011630A1 (en) * 1991-11-27 1993-06-10 Valtion Teknillinen Tutkimuskeskus Method and apparatus for producing a false colour image
US5555464A (en) * 1995-07-28 1996-09-10 Lockheed Martin Corporation Red/near-infrared filtering for CCD cameras
ES2111455A1 (en) * 1995-03-24 1998-03-01 Univ Catalunya Politecnica Device for viewing ultraviolet and infrared images by conversion to the spectral domain of the human eye.
EP0915374A1 (en) * 1997-11-11 1999-05-12 Konica Corporation Image forming method
US7365771B2 (en) 2001-03-28 2008-04-29 Hewlett-Packard Development Company, L.P. Camera with visible and infra-red imaging
WO2009086969A1 (en) * 2008-01-10 2009-07-16 Robert Bosch Gmbh Method for processing and analyzing a color image, and associated driver assistance system

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US4170987A (en) * 1977-11-28 1979-10-16 California Institute Of Technology Medical diagnosis system and method with multispectral imaging
US4225242A (en) * 1978-02-08 1980-09-30 Sortex North America, Inc. Four color tomato grader
US4679068A (en) * 1985-07-25 1987-07-07 General Electric Company Composite visible/thermal-infrared imaging system
US4685451A (en) * 1981-09-12 1987-08-11 Fuji Photo Optical Co., Ltd. Endoscope apparatus using solid state image pickup device
US4717952A (en) * 1985-06-14 1988-01-05 Canon Kabushiki Kaisha Medical television system
US4751571A (en) * 1987-07-29 1988-06-14 General Electric Company Composite visible/thermal-infrared imaging apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4170987A (en) * 1977-11-28 1979-10-16 California Institute Of Technology Medical diagnosis system and method with multispectral imaging
US4225242A (en) * 1978-02-08 1980-09-30 Sortex North America, Inc. Four color tomato grader
US4685451A (en) * 1981-09-12 1987-08-11 Fuji Photo Optical Co., Ltd. Endoscope apparatus using solid state image pickup device
US4717952A (en) * 1985-06-14 1988-01-05 Canon Kabushiki Kaisha Medical television system
US4679068A (en) * 1985-07-25 1987-07-07 General Electric Company Composite visible/thermal-infrared imaging system
US4751571A (en) * 1987-07-29 1988-06-14 General Electric Company Composite visible/thermal-infrared imaging apparatus

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Title
PATENT ABSTRACTS OF JAPAN, Vol 8, No 247, E278, Abstract of JP 59-123387, publ 1984-07-17 Canon K.K. *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993011630A1 (en) * 1991-11-27 1993-06-10 Valtion Teknillinen Tutkimuskeskus Method and apparatus for producing a false colour image
US5557326A (en) * 1991-11-27 1996-09-17 Valtion Teknillinen Tutkimuskeskus Method and apparatus for producing a false color image
ES2111455A1 (en) * 1995-03-24 1998-03-01 Univ Catalunya Politecnica Device for viewing ultraviolet and infrared images by conversion to the spectral domain of the human eye.
US5555464A (en) * 1995-07-28 1996-09-10 Lockheed Martin Corporation Red/near-infrared filtering for CCD cameras
EP0915374A1 (en) * 1997-11-11 1999-05-12 Konica Corporation Image forming method
US6171768B1 (en) 1997-11-11 2001-01-09 Konica Corporation Image forming method
US7365771B2 (en) 2001-03-28 2008-04-29 Hewlett-Packard Development Company, L.P. Camera with visible and infra-red imaging
WO2009086969A1 (en) * 2008-01-10 2009-07-16 Robert Bosch Gmbh Method for processing and analyzing a color image, and associated driver assistance system
DE102008003791B4 (en) * 2008-01-10 2017-03-16 Robert Bosch Gmbh Method for processing and evaluating a color image and associated driver assistance system

Also Published As

Publication number Publication date
DK288290D0 (en) 1990-12-04
FI882901A0 (en) 1988-06-16
HUT55576A (en) 1991-05-28
HU893760D0 (en) 1991-04-29
DK288290A (en) 1990-12-07
KR900702725A (en) 1990-12-08
FI79641B (en) 1989-09-29
AU3835489A (en) 1990-01-12
FI79641C (en) 1990-01-10
EP0422059A1 (en) 1991-04-17

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