Chrominance signal generator having a patterned filter

Claim 2

A chrominance signal generator comprising a filter having a color pattern of stripes or a lattice placed in front of a plane on which an image of an object is projected, said pattern being arranged in a manner such that when an image projected on said plane through said filter is scanned by a scanning means, a composite chrominance signal is obtained, said composite signal comprising three component signals representing three special color components respectively corresponding to the green component, either one of red and green or blue and green component, and red and blue and green component of said image, said three component signals occurring in an identical repetition period but in different phases to each other; means for obtaining said composite chrominance signal by scanning said image projected thereto; a delay circuit for delaying said composite circuit the inputs of which are said composite chrominance signal and the output of said delay circuit; means for extracting an index signal from the output of said operation circuit to thereby obtain a gating signal; means for obtaining the red component and blue component fRom said output of said operation circuit on the basis of said gating signal; and means for obtaining the green component from said red and blue components and said composite chrominance signal.

Claim 3

A chrominance signal generator as defined in claim 1, wherein said filter has a color pattern arranged in such a manner that said composite chrominance signal obtained in any horizontal scanning is different in the phasic position from the corresponding signal in the preceding scanning by one third of said identical repetition period, and said predetermined time delayed by said delay circuit corresponds to on horizontal scanning period.

Claim 4

A chrominance signal generator as defined in claim 1, wherein said plane on which an image of an object is projected is a plane of black- and-white sensitive film and said signal generator includes means for projecting an image recorded on said black-and-white sensitive film onto said means for obtaining said composite chrominance signal by scanning.

Claim 5

A black- and-white sensitive film for the chrominance signal generation, on which are recorded a black- and-white image of an object and a color information about the object, said image and color information being obtained by focusing the light from the object on the sensitive film through a special color filter having a striped or latticed pattern, said pattern being arranged in a manner such that, when the image focused on the film is scanned by a scanning means in a predetermined direction, a composite chrominance signal is obtained, said composite signal comprising three component signals representing three special color components respectively corresponding to the green component, either one of the red and green or blue and green component, and the red and blue and green component of said image, said three component signals occurring in an identical repetition period but in different phases to each other, and said composite signal being different in the phasic position from the corresponding signal in the preceding scanning by one third of said identical repetition period.

Claim 6

A black- and-white sensitive film for the chrominance signal generation, on which are recorded a black- and-white image of an object and a color information about the object, said image and color information being obtained by focusing the light from the object on the sensitive film through a special color filter having a striped or latticed pattern, said pattern being arranged in a manner such that, when the image focused on the film is scanned by a scanning means in a predetermined direction, a composite chrominance signal is obtained, said composite signal comprising three component signals representing three special color components respectively corresponding to the green component, either one of the red and green or blue and green component, and the red and blue and green component of said image, said three component signals occurring in an identical repetition period but in different phases to each other, and said composite signal being different in the phasic position from the corresponding signal in the preceding scanning by one third of said identical repetition period.

Claim 7

A chrominance signal generator as defined in claim 1, wherein said index signal extracted by said means for extracting an index signal is the red and blue component.

Claim 8

A chrominance signal generator as defined in claim 2, wherein said filter having a color pattern of stripe is placed in such that the direction of the stripes is inclined at a predetermined angle theta cos 1 (d1/d2) in relation to the direction of the electronic scanning, where d1 is the width of each stripe and d2 is the distance between scanning lines.

Claim 9

A chrominance signal generator comprising a filter having a color pattern of stripes placed in front of a plane on which an image of an object is projected, said pattern being arranged in a manner such that when an image projected on said plane through said optical filter is scanned horizontally with an electron beam, a composite chrominance signal is obtained, said composite signal comprising three component signals respectively corresponding to the green component, either one of the red and green or blue and green component, and the red and blue and green component, said three component signals occurring in an identical repetition period but in different phases to each other, and said composite signal being different in the phasic position from the corresponding signal in the preceding scanning by one third of said identical petition period; means for obtaining said composite chrominance signal by scanning said image projected thereto; a delay circuit for delaying said composite chrominance signal by one horizontal scanning period; a subtractor circuit for obtaining the difference signal between said composite chrominance and the output of said delay circuit; means for extracting the red and blue component as an index signal from the output of said subtractor circuit to thereby obtain a gating signal; means for obtaining the red component and the blue component from said output of said subtractor circuit on the basis of said gating signal; and means for obtaining the green component from a part of said red and blue components, said composite chrominance signal and said gate signal.

Claim 10

A chrominance signal generator comprising a filter having a color pattern of stripes placed in front of a plane on which an image of an object is projected, said pattern being arranged in a manner such that when an image projected on said plane through said optical filter is scanned horizontally with an electron beam, a composite chrominance signal is obtained, said composite signal comprising three component signals respectively corresponding to the green component, either one of the red and green or blue and green component, and the red and blue and green component, said three component signals occurring in an identical repetition period but in different phases to each other, and said composite signal being different in the phasic position from the corresponding signal in the preceding scanning by one third of said identical petition period; means for obtaining said composite chrominance signal by scanning said image projected thereto; a delay circuit for delaying said composite chrominance signal by one horizontal scanning period; a subtractor circuit for obtaining the difference signal between said composite chrominance and the output of said delay circuit; means for extracting the red and blue component as an index signal from the output of said subtractor circuit to thereby obtain a gating signal; means for obtaining the red component and the blue component from said output of said subtractor circuit on the basis of said gating signal; and means for obtaining the green component from a part of said red and blue components, said composite chrominance signal and said gate signal.

Claim 11

A generator according to claim 7, wherein said means for extracting the red component and the blue component from the output of said subtractor comprises a first gate circuit connected to the output of said subtractor, a second delay circuit connected to the output of said index signal extracting means, said first gate circuit being gated by said delay circuit and a first low-pass filter connected to the output of said first gate circuit to thereby provide said red component, and a second gate circuit connected to the output of said subtractor, and a third delay circuit connected to the output of said second delay circuit, said second gate circuit being gated by said third delay circuit and a second low-pass filter connected to the output of said second gate circuit to thereby provide said blue component.

Claim 12

A generator according to claim 8, wherein said means for extracting the red and blue component comprises an adder circuit connected to the output of said first and second low-pass filter.

Claim 13

A generator according to claim 9, wherein said means for obtaining the green component comprises a third gate circuit connected to the output of said adder circuit and being gated by the output of said index signal extracting means, a fourth gate circuit connected to the output of said first low-pass filter and being gated by the output of said third delay circuit and an additional adder circuit responsive to the output of said fourth gate circuit and said third gate circuit for adding the signals provided thereby, a frequency compensator connected to said additional adder circuit and an additional subtractor circuit for obtaining the difference between the output of said frequency compensator and said means for obtaining the composite chrominance signal, to thereby provide said green signal.