Colored light encoding filter

Claim 2

A spatial color encoding filter for separating imagerepresentative light into color components for forming a monochromatic image thereof which upon being scanned yields a color-representative carrier wave component, comprising: first and second sets of parallel strips, the strips of said first set alternating with the strips of said second set; said first set of strips having a transmission characteristic so as to pass light of selected color components and to effectively block by absorption light of another color component, but undesirably absorbing a portion of said light of selected color components; and said second set of strips having a transmission characteristic so as to pass selected color components of different spectral ranges than those passed by said first set of strips but at the same time passing substantially the same portion of the undesirably absorbed component which is passed by said first set of strips and to absorb light of the same color as that undesirably absorbed by said first set of strips and in an amount substantially equal to that absorbed by said first set of strips.

Claim 3

A spatial color encoding filter as defined in claim 1, wherein: said selected color components constitute first and second primary colors, and said other color component constitutes a third primary color.

Claim 4

A spatial color encoding filter as defined in claim 2, wherein: said second set of strips is of a material to pass neutral grey subject-derived light.

Claim 5

A spatial color encoding filter as defined in claim 2, wherein: said first set of strips undesirably absorbs more light of said first primary color component than light of said second primary color component; and said second set of strips is of a material to pass subject derived light of a color component complementary to said first primary color component.

Claim 6

A spatial color encoding filter as defined in claim 4, wherein: said first, second and third primary color components are green, blue and red, respectively; and said complementary color component is magenta.

Claim 7

A spatial color encoding filter as defined in claim 4, wherein: said first, second and third primary color components are green, red and blue respectively; and said complementary color component is magenta.

Claim 8

A spatial color encoding filter for separating image-representative light into primary color components for forming a monochromatic image thereof which upon being scanned yields color-representative carrier wave components comprising: first and second gratings, each having first and second sets of substantially parallel strips, the strips of a first set alternating with strips of a second set, the strips of said first and second grating being so arranged relative to one another that, when image-representative light passes therethrough, such light is separated into color components; said first set of strips of said first grating having a transmission characteristic so as to pass light of first color components from a subject and to block light of color components other than said first components, but undesirably absorbing a portion of said light of said first color components; said first set of strips of said second grating having a transmission characteristic so as to pass light of said second color components; said second set of strips of said first and second gratings respectively having transmission characteristics so as to pass selected color components of different spectral ranges than those passed by said first set of strips of said first and second gratings, respectively, but at the same time passing substantially the same portion of the undesirably absorbed component which is passed by said first set of strips of said first and second gratings, respectively, and to absorb light of said first and second color components, respectively, in amounts substantially equal to the amounts thereof undesirably absorbed by corresponding strips of said first set of strips of said first and second gratings.

Claim 9

A spatial color encoding filter for separating image-representative light into primary color components for forming a monochromatic image thereof which upon being scanned yields color-representative carrier wave components comprising: first and second gratings, each having first and second sets of substantially parallel strips, the strips of a first set alternating with strips of a second set, the strips of said first and second grating being so arranged relative to one another that, when image-representative light passes therethrough, such light is separated into color components; said first set of strips of said first grating having a transmission characteristic so as to pass light of first color components from a subject and to block light of color components other than said first components, but undesirably absorbing a portion of said light of said first color components; said first set of strips of said second grating having a transmission characteristic so as to pass light of said second color components; said second set of strips of said first and second gratings respectively having transmission characteristics so as to pass selected color components of different spectral ranges than those passed by said first set of strips of said first and second gratings, respectively, but at the same time passing substantially the same portion of the undesirably absorbed component which is passed by said first set of strips of said first and second gratings, respectively, and to absorb light of said first and second color components, respectively, in amounts substantially equal to the amounts thereof undesirably absorbed by corresponding strips of said first set of strips of said first and second gratings.

Claim 10

A spatial color encoding filter as defined in claim 7, wherein said first color components comprise first and second primary colors and said second color components comprise second and third primary colors.

Claim 11

A spatial color encoding filter as defined in claim 8, wherein said first, second and third primary colors are blue, green and red, respectively.

Claim 12

A spatial color encoding filter as defined in claim 9, wherein said second set of strips is of a material to pass neutral grey light.

Claim 13

A spatial color encoding filter as defined in claim 9, wherein said second set of strips is of a material to pass magenta light.

Claim 14

In a color television system, a spatial color encoding filter through which to project colored light from a subject onto a camera tube, comprising: a grating having first and second sets of parallel strips, the strips of said first set alternating with the strips of said second set; said first set of strips having a transmission characteristic so as to pass light of first and second primary colors from said subject and to effectively block light of a third primary subject color, but undesirably absorbing some light of said first primary color; and said second set of strips having a transmission characteristic so as to pass selected color components of different spectral ranges than those passed by said first set of strips but at the same time passing substantially the same portion of the undesirably absorbed component which is passed by said first set of strips and to absorb light of said first primary color from said subject in an amount substantially equal to that absorbed by said first set of strips.

Claim 15

In a color television system, a spatial color encoding filter through which to project colored light from a subject onto a camera tube, comprising: a grating having first and second sets of parallel strips, the strips of said first set alternating with the strips of said second set; said first set of strips having a transmission characteristic so as to pass light of first and second primary colors from said subject and to effectively block light of a third primary subject color, but undesirably absorbing some light of said first primary color; and said second set of strips having a transmission characteristic so as to pass selected color components of different spectral ranges than those passed by said first set of strips but at the same time passing substantially the same portion of the undesirably absorbed component which is passed by said first set of strips and to absorb light of said first primary color from said subject in an amount substantially equal to that absorbed by said first set of strips.

Claim 16

A spatial color encoding filter as defined in claim 12, wherein: said first primary subject color light is green; and said second primary subject color light is blue.

Claim 17

A spatial color encoding filter as defined in claim 13, wherein: said first set of strips is of a material to pass cyan light from said subject; and said second set of strips is of a material to pass neutral grey subject light.

Claim 18

A spatial color encoding filter as defined in claim 13, wherein: said first set of strips is of a material to pass cyan light from said subject; and said second set of strips is of a material to pass magenta subject light.

Claim 19

A spatial color encoding filter as defined in claim 12, wherein: said first primary subject color light is green; and said second primary subject color light is red.

Claim 20

A spatial color encoding filter as defined in claim 16, wherein: said first set of strips is of a material to pass yellow light from said subject; and said second set of strips is of a material to pass neutral grey subject light.

Claim 21

A spatial color encoding filter as defined in claim 16, wherein: said first set of strips is of a material to pass magenta subject light.

Claim 22

In a color television system, a spatial color encoding filter through which to project light of first, second and third primary colors from a subject onto the photosensitive electrode of a camera tube to be scanned by an electron beam, comprising: a low frequency and a high frequency grating, each having first and second sets of substantially equal width parallel strips, the strips of said first set alternating with the strips of said second set; the strips of said low and high frequency gratings being so arranged relative to one another that, when the corresponding areas of the photosensitive electrode of the camera tube are scanned by said electron beam, two color representative signals are generated as amplitude modulations of two carrier waves respectively having low and high frequencies relative to one another; the first set of strips of said low frequency grating having a transmission characteristic so as to pass light from said subject of said first and second primary colors and to effectIvely block subject light of said third primary color, but undesirably absorbing some light of said first primary color; the first set of strips of said high frequency grating having a transmission characteristic so as to pass light from said subject of said first and third primary colors and to effectively block subject light of said second primary color, but undesirably absorbing some light of said first primary color; and the second set of said low and high frequency gratings having a transmission characteristic so as to pass selected color components of different spectral ranges than those passed by said first set of strips of said high and low frequency gratings, respectively, but at the same time passing substantially the same portion of the undesirably absorbed component which is passed by said first set of strips of said high and low frequency gratings, respectively, and to absorb light of said first primary color from said subject in an amount substantially equal to that undesirably absorbed by the respectively associated first set of strips of each of said low and high frequency gratings.

Claim 23

In a color television system, a spatial color encoding filter through which to project light of first, second and third primary colors from a subject onto the photosensitive electrode of a camera tube to be scanned by an electron beam, comprising: a low frequency and a high frequency grating, each having first and second sets of substantially equal width parallel strips, the strips of said first set alternating with the strips of said second set; the strips of said low and high frequency gratings being so arranged relative to one another that, when the corresponding areas of the photosensitive electrode of the camera tube are scanned by said electron beam, two color representative signals are generated as amplitude modulations of two carrier waves respectively having low and high frequencies relative to one another; the first set of strips of said low frequency grating having a transmission characteristic so as to pass light from said subject of said first and second primary colors and to effectIvely block subject light of said third primary color, but undesirably absorbing some light of said first primary color; the first set of strips of said high frequency grating having a transmission characteristic so as to pass light from said subject of said first and third primary colors and to effectively block subject light of said second primary color, but undesirably absorbing some light of said first primary color; and the second set of said low and high frequency gratings having a transmission characteristic so as to pass selected color components of different spectral ranges than those passed by said first set of strips of said high and low frequency gratings, respectively, but at the same time passing substantially the same portion of the undesirably absorbed component which is passed by said first set of strips of said high and low frequency gratings, respectively, and to absorb light of said first primary color from said subject in an amount substantially equal to that undesirably absorbed by the respectively associated first set of strips of each of said low and high frequency gratings.

Claim 24

A spatial color encoding filter as defined in claim 19, wherein: said first, second and third primary subject colors are green, blue and red respectively; the first set of strips of one of said gratings being of a material to pass cyan (comprising said green and blue) light from said subject and to effectively block said red subject light; the first set of strips of the other of said gratings being of a material to pass yellow (comprising said green and red) light from said subject and to effectively block said blue subject light; and the second set of strips of each of said gratings being of a material to pass neutral grey subject light.

Claim 25

A spatial color encoding filter as defined in claim 20, wherein: said cyan and yellow light passing materials have gently sloping characteristics which substantially match the responses of the human eye to such colors.

Claim 26

A spatial color encoding filter as defined in claim 21, wherein: said high frequency grating including said cyan passing strips is mounted so that corresponding areas of said photosensitive camera tube electrode are substantially at right angles to the scanning lines of said electron beam, whereby the generated carrier wave modulated by said red subject light representative signals is of a relatively high frequency; and said low frequency grating including said yellow light passing strips is mounted so that the corresponding areas of said photosensitive camera tube electrode are at an oblique angle to the scanning lines of said electron beam, whereby the generated carrier wave modulated by said blue subject light representative signals is of a relatively low frequency.

Claim 27

A spatial color encoding filter as defined in claim 19, wherein: said first, second and third primary subject colors are green, blue and red respectively; the first set of strips of one of said gratings being of a material to pass cyan (comprising said green and blue) light from said subject and to effectively block said red subject light; the first set of strips of the other of said gratings being of a material to pass yellow (comprising said green and red) light from said subject and to effectively block said blue subject light; and the second set of strips of each of said grating being of a material to pass magenta (comprising said red and blue) light from said subject.

Claim 28

A spatial color encoding filer as defined in claim 23, wherein: said cyan and yellow light passing material have gently sloping characteristics to substantially match the responses of the human eye to such colors; and said magenta light passing material, in addition to absorbing the desired amount of said green subject light, also fully passes said red and blue subject light so as to enhance the amplitude modulation of the respective carrier waves by said red and blue subject light rEpresentative signals.

Claim 29

A spatial color encoding filter as defined in claim 24, wherein: said high frequency grating including said cyan light passing strips is mounted so that the corresponding areas of said photosensitive camera tube electrode are substantially at right angles to the scanning lines of said electron beam, whereby the generated carrier wave modulated by said red subject light representative signals is of a relatively high frequency; and said low frequency grating including said yellow light passing strips is mounted so that the corresponding areas of the photosensitive camera tube electrode are at an oblique angle to the scanning lines of said electron beam, whereby the generated carrier wave modulated by said blue subject light representative signals is of a relatively low frequency.