Color signal producing system utilizing spatial color encoding and comb filtering
阅读：888发布：2022-03-11
专利汇可以提供Color signal producing system utilizing spatial color encoding and comb filtering专利检索，专利查询，专利分析的服务。并且Colored light from a scene is spatially encoded onto a photosensitive surface by a striped spatial color encoding filter assembly including first and second superimposed encoding gratings having equal pitch encoding stripes disposed such that the stripes of the respective gratings are at substantially equal and opposite angles measured from a reference line in the plane of the filter. Scanning of the encoded image on the photosensitive surface produces a composite signal including first and second carrier wave components representative of first and second colors and having substantially the same frequency during a scanning interval. The carrier wave components are separated by comb filter apparatus for producing separate color representative signals.，下面是Color signal producing system utilizing spatial color encoding and comb filtering专利的具体信息内容。
1. A system for producing signals representative of the color of a scene, comprising: an image pickup device; striped spatial color encoding filter means comprising at least first and second gratings for respectively encoding at least first and second colors, said gratings being disposed between said scene and a photosensitive electrode of said image pickup device for filtering the scene light reaching said electrode such that a composite signal representative or the color of said scene is derived from said image pickup device during scanning of said photosensitive electrode, the encoding stripes of said first and second gratings being angularly disposed relative to the stripes of each other, said stripes of both of said first and second gratings having the same pitch and the stripes of said first and second gratings being disposed at equal and opposite angles from the direction of scanning such that said scanning produces said composite signal including first and second amplitude modulated color representative carrier wave components each having the same nominal carrier freqeuncy during a scanning interval and a nominal phase shift of substantially 90* at said nominal carrier frequency between corresponding points in successive scanning intervals; an signal processing means coupled to said image pickup device for combining signals derived from a plurality of successively scanned lines to derive separately and simultaneously a first output comprising said first color representative carrier wave components to the substantial exclusion of said second color representative carrier wave components, and a second output comprising said second color representative carrier wave components to the substantial exclusion of said first color representative carrier wave components; said signal processing means including: 1. bandpass filter means coupled to said image pickup device for separating said color representative carrier wave components from said composite signal; 2. means, having an input coupled to said bandpass filter means, for delaying said carrier wave components for a line scanning interval; 3. first signal combining means; 4. means for utilizing said first signal combining means to combine signals appearing at the input an output of said line interval delaying means in such manner that said first carrier wave components from said input and output of said line interval delaying means combine in reinforcing phase relationship in the output of said first combining means whereas said second carrier wave components from said input and output of said line interval delaying means combine in cancelling phase relationship in the output of said combining means whereby the output of said first combining means constitutes said first output of said signal processing means; 5. second signal combining means; 6. means for utilizing said second combining means to combine signals appearing at the input and output of said line interval delaying means in such manner that said second carrier wave components from said input and output of said line interval delaying means combine in reinforcing phase relationship in the output of said second combining means whereas said first carrier wave components from said input and output of said line interval delaying means combine in cancelling phase relationship in the output of said second combining means whereby the output of said second combining means constitutes said second output of said signal processing means; 7. each of said utilizing means incluDing respective couplings (a) between said line interval delaying means output and a first input of the respective combining means, and (b) between said line interval delaying means input and a second input of the respective combining means, one of said couplings including a phase shift network for subjecting carrier wave components to a phase shift corresponding to 90* at said nominal carrier frequency.
2. means, having an input coupled to said bandpass filter means, for delaying said carrier wave components for a line scanning interval;
2. signal combining means;
2. A system in accordance with claim 1 for producing signals representative of the color of a scene, further comprising: said color encoding filter means also including a third color encoding grating for encoding a third color, said third grating having a stripe pitch different from the stripe pitch of said first and second gratings such that scanning of said photosensitive electrode produces said composite signal including third color representative carrier wave components having a different carrier frequency during a scanning interval than said first and second color representative carrier wave components; said signal processing means including second bandpass filter means coupled to said image pickup device for separating said third color representative carrier wave components from said composite signal; means coupled to said image pickup device for producing a brightness representative signal, said stripes of said filter being selected such that the average transmission of light by said filter is representative of the brightness of said scene; detecting means coupled to said combining means for demodulating said amplitude modulated color representative carrier waves and their associated sidebands; additional detecting means coupled to said second bandpass filter for demodulating said third color representative carrier wave components; and matrixing means coupled to said detecting means and to said brightness representative signal producing means for combining said color and brightness representative signals for producing second singals representative of the color of a scene.
3. A system for producing signals representative of the color of a scene according to claim 1 wherein said stripes of said filter are selected such that the average transmission of light by said filter is representative of the brightness of said scene; said system also including: means coupled to said image pickup device for producing brightness representative signals; and means coupled to said producing means for limiting said brightness representative signals to frequencies below said nominal carrier frequency.
3. first signal combining means;
3. means for utilizing said signal combining means to combine signals appearing at the input and output of said line interval delaying means in such manner that said first carrier wave components from said input and output of said line interval delaying means combine in reinforcing phase relationship in the output of said combining means whereas said second carrier wave components from said input and output of said line interval delaying means combine in cancelling phase relationship in the output of said combining means;
4. additional signal combining means;
4. A system according to claim 3 wherein: detecting means are coupled to said combining means for demodulating said amplitude modulated color representative carrier waves and their associated sidebands; and matrixing means are coupled to said detecting means and to said frequency limiting means for combining said frequency limited brightness representative signals and the outputs of said detecting means for producing second signals representative of the color of a scene.
4. means for utilizing said first signal combining means to combine signals appearing at the input an output of said line interval delaying means in such manner that said first carrier wave components from said input and output of said line interval delaying means combine in reinforcing phase relationship in the output of said first combining means whereas said second carrier wave components from said input and output of said line interval delaying means combine in cancelling phase relationship in the output of said combining means whereby the output of said first combining means constitutes said first output of said signal processing means;
5. second signal combining means;
5. means for utilizing said additional combining means to combine signals appearing at the input and output of said line interval delaying means in such manner that said second carrier wave components from said input and output of said line interval delaying means combine in reinforcing phase relationship in the output of said additional combining means whereas said first carrier wave components from said input and output of said line interval delaying means combine in cancelling phase relationship in the output of said additional combining means;
5. A system for producing signals representative of the color of a scene, comprising: an image pickup device; striped spatial color encoding filter means comprising first, second, and third gratings for encoding first, second, and third colors, respectively, said gratings being disposed between said scene and a photosensitive electrode of said image pickup device for filtering the scene light reaching said electrode such that a composite signal representative of the color of said scene is derived from said image pickup device during scanning of said photosensitive electrode, the encoding stripes of said first and second gratings being angularly disposed relative to the stripes of each other, said stripes of both of said first and second gratings having the same pitch and the stripes of said first and second gratings being disposed at equal and opposite angles from the direction of scanning such that said scanning prodUces said composite signal including first and second amplitude modulated color representative carrier wave components each having the same nominal carrier frequency during a scanning internal and a nominal phase shift of substantially 90* at said nominal carrier frequency between corresponding points in successive scanning intervals; said stripes of said third grating having the stripe width selected and the angle of inclination of the stripes of said third grating so disposed such that the width of each of the stripes of said third grating in the direction of scan is different than the width of the stripes of said first and second gratings such that said scanning of the encoded image on said photosensitive medium produces third amplitude modulated color representative carrier wave components having a different nominal carrier frequency during a scanning interval than said first and second color representative carrier wave components; first bandpass filter means coupled to said image pickup device for separating said first and second color representative carrier wave components from said composite signal; means, having an input coupled to said first bandpass filter means, for delaying said first and second carrier wave components for a line scanning interval; first signal combining means; means for utilizing said first signal combining means to combine signals appearing at the input and output of said line interval delaying means in such manner that said first carrier wave components from said input and output of said line interval delaying means combine in reinforcing phase relationship in the output of said combining means whereas said second carrier wave components from said input and output of said line interval delaying means combine in cancelling phase relationship in the output of said first combining means; second signal combining means; means for utilizing said second combining means to combine signals appearing at the input and output of said line interval delaying means in such manner that said second carrier wave components from said input and output of said line interval delaying means combine in reinforcing phase relationship in the output of said second combining means whereas said first carrier wave components from said input and output of said line interval delaying means combine in cancelling phase relationship in the output of said second combining means; each of said utilizing means including respective couplings (a) between said line interval delaying means output and a first input of the respective combining means, and (b) between said line interval delaying means input and a second input of the respective combining means, one of said couplings including a phase shift network for subjecting carrier wave components to a phase shift corresponding to 90* at said nominal carrier frequency; second bandpass filter means coupled to said image pickup device for separating said third color representative carrier wave components from said composite signal.
6. each of said utilizing means including respective couplings (a) between said line interval delaying means output and a first input of the respective combining means, and (b) between said line interval delaying means input and a second input of the respective combining means, one of said couplings including a phase shift network for subjecting carrier wave components to a phase shift corresponding to 90* at said nominal carrier frequency.
6. means for utilizing said second combining means to combine signals appearing at the input and output of said line interval delaying means in such manner that said second carrier wave components from said input and output of said line interval delaying means combine in reinforcing phase relationship in the output of said second combining means whereas said first carrier wave components from said input and output of said line interval delaying means combine in cancelling phase relationship in the output of said second combining means whereby the output of said second combining means constitutes said second output of said signal processing means;
6. Apparatus in accordance with claim 5 wherein said different nominal carrier frequency resulting from scanning of said third grating is higher in frequency than said nominal carrier frequency resulting from scanning said first and second gratings, and wherein the stripes of said filter gratings are selected such that the average transmission of light by said filter is representative of the brightness of said scene, said apparatus also including: means coupled to said image pickup device for deriving brightness representative signals therefrom; means coupled to said brightness representative signal deriving means for limiting said brightness representative signals to frequencies below both of said nominal carrier frequencies; first and second detecting means respectively responsive to the outputs of said first and second combining means for demodulating said first and second amplitude modulated color representative carrier waVe components; third detecting means responsive to the output of said second bandpass filter means for demodulating said third amplitude modulated color representative carrier wave components; and output signal deriving means responsive to said frequency limited brightness representative signals and the outputs of said first, second and third detecting means.
7. each of said utilizing means incluDing respective couplings (a) between said line interval delaying means output and a first input of the respective combining means, and (b) between said line interval delaying means input and a second input of the respective combining means, one of said couplings including a phase shift network for subjecting carrier wave components to a phase shift corresponding to 90* at said nominal carrier frequency.
7. Apparatus in accordance with claim 5 wherein said different nominal carrier frequency resulting from scanning of said third grating is lower in frequency than said nominal carrier frequency resulting from scanning said first and second gratings, wherein the stripe pitch and inclination of said third grating is such as to produce said third carrier wave components at said different nominal carrier frequency with a nominal phase shift of 180* at said different nominal carrier frequency between corresponding points in successive scanning intervals, and wherein the stripes of said filter gratings are selected such that the average transmission of light by said filter is representative of the brightness of said scene and said composite signal contains brightness representative signals, said apparatus also including; first and second detecting means respectively responsive to the outputs of said first and second combining means for demodulating said first and second amplitude modulated color representative carrier wave components; comb filter means responsive to the output of said second bandpass filter means for passing said third amplitude modulated color representative carrier wave components to the substantial exclusion of components of said brightness representative signals falling within the passband of said second bandpass filter means; third detecting means responsive to the output of said comb filter means for demodulating said third amplitude modulated color representative carrier wave components; means for deriving brightness representative signals, occupying a frequency band extending up to a frequency intermediate said nominal carrier frequencies, from said image pickup device; said deriving means including additional comb filter means responsive to the output of said second bandpass filter means for passing components of said brightness representative signals to the substantial exclusion of said third modulated color representative carrier wave components; and output signal deriving means responsive to said brightness representative signals and the outputs of said first, second and third detecting means.
8. A system for producing signals representative of the color of a scene, comprising: an image pickup device; striped spatial color encoding filter means comprising at least first and second gratings for encoding at least first and second colors, said gratings being disposed between said scene and a photosensitive electrode of said image pickup device for filtering the scene light reaching said electrode such that a composite signal representative of the color of said scene is derived from said image pickup device during scanning of said photosensitive electrode, the encoding stripes of first and second of said gratings being angularly disposed relative to the stripes of each other, said stripes of both of said first and second gratings having substantially the same pitch and the stripes of said first and second gratings being disposed at equal and opposite angles from the direction of scanning such that said scanning produces said composite signal including first and second amplitude modulated color representative carrier wave components each having the same nominal carrier frequency during a scanning interval and a nominal phase shift of 90* at said nominal carrier frequency between corresponding points in successive scanning intervals; bandpass filter means coupled to said image pickup device for separating said color representative carrier wave components from said composite signal; delay means coupled to said bandpass filtEr means for delaying said carrier wave components for one line scanning interval; inverting means coupled to said bandpass filter means for inverting the polarity of said carrier wave components; first phase shifting means coupled to said delay means for subjecting said delayed carrier wave components to a phase shift of 90* at said nominal carrier frequency; first combining means coupled to said first phase shifting means and to said inverting means for combining the carrier wave components obtained from said first phase shifting means and from said inverting means for producing first separated color representative carrier wave components; second phase shifting means coupled to said inverting means for subjecting said inverted carrier wave components to a phase shift of 90* at said nominal carrier frequency; and second combining means coupled to said delay means and to said second phase shifting means for combining the carrier wave components obtained from said delay means and from said second phase shifting means for producing second separated color representative carrier wave components.
9. A system for producing signals representative of a scene according to claim 8 including detecting means coupled to said first and second signal combiners for demodulating said first and second separated color representative carrier wave components.
10. A system for producing signals representative of a scene according to claim 9 wherein: said stripes of said color encoding gratings are selected such that the average transmission of light by said filter means corresponds to the brightness of said scene, and said composite signal contains a brightness representative signal; brightness signal filter means are coupled to said image pickup device for separating said brightness representative signals from said composite signal; and matrixing means are coupled to said detecting means and to said brightness signal filter means for combining the signals obtained therefrom for producing a plurality of separate color representative signals.
11. A system for producing signals representative of the color of a scene, comprising: an image pickup device; striped spatial color encoding filter means comprising at least first and second gratings for encoding at least first and second colors, said gratings being disposed between said scene and a photosensitive electrode of said image pickup device for filtering the scene light reaching said electrode such that a composite signal representative of the color of said scene is derived from said image pickup device during scanning of said photosensitive electrode, the encoding stripes of first and second of said gratings being angularly disposed relative to the stripes of each other, said stripes of both of said first and second gratings being disposed at equal and opposite angles from the direction of scanning such that said scanning produces said composite signal including first and second amplitude modulated color representative carrier wave components having substantially the same frequency during a scanning interval; bandpass filter means coupled to said image pickup device for separating said color representative carrier wave components from said composite signal; first and second delay means serially coupled to said bandpass filter means for producing, respectively, first and second delayed carrier wave components, the delay of each of said first and second delay means being substantially equal to one line scanning interval; third delay means coupled to said second delay means for delaying said second delayed carrier wave components for a first portion of the period of said carrier waves; inverting amplifier means coupled to said first delay means for inverting said first delayed carrier wave components; four delay means coupled to said inverting amplifier means for delaying said inverted carrier wave components for a second portion of The period of said carrier waves; fifth delay means coupled to said bandpass filter means for delaying said carrier wave components for a first portion of the period of said carrier waves; first signal combiner means coupled to said third, fourth, and fifth delay means for combining the carrier wave components obtained therefrom for producing first separated color representative carrier wave components; and second signal combiner means coupled to said second, fourth and fifth delay means for combining the carrier wave components obtained therefrom for producing second separated color representative carrier wave components.
12. A system for producing signals representative of a scene according to claim 11 including detecting means coupled to said first and second signal combiners for demodulating said first and second separated color representative carrier wave components.
13. A system for producing signals representative of a scene according to claim 12 wherein: said stripes of said color encoding gratings are selected such that the average transmissivity of said filter means contains a brightness representative signal; brightness signal bandpass filter means are coupled to said image pickup device for separating said brightness representative signals from said composite signal; and matrixing means are coupled to said detecting means and to said brightness signal bandpass filter means for combining the signals obtained therefrom for producing a plurality of separate color representative signals.
14. A system for encoding a plurality of colors, comprising: a photosensitive medium; a stripped spatial color encoding filter assembly disposed between an object and said photosensitive medium for spatially encoding colored light from said object onto said photosensitive medium, said filter assembly including; first and second superimposed encoding gratings each having a pattern of stripes of material for encoding a respectively different one of first and second colors as amplitude modulation of a spatial carrier frequency, said stripes of both of said gratings having the same pitch and said stripes of each of said gratings disposed at substantially equal and opposite angles from a common reference line such that subsequent scanning of the encoded image on said photosensitive medium in a direction normal to said reference line produces first and second amplitude moduated carrier wave components each having substantially the same nominal carrier frequency during a scanning interval and a nominal phase shift of 90* at said nominal carrier frequency between corresponding points in successive scanning intervals; means for scanning said photosensitive medium in said direction normal to said reference line; and signal processing means including comb filter means responsive to the scanning of said photosensitive medium for separating said first and second carrier wave components for producing separated signals representative of light of respectively different ones of said first and second colors; said comb filter means including:
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