US3647948A
Expired / Lapsed
US
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Chrominance signal generator having striped filter
Assignee: Hitachi Ltd
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Filing: 1970-04-02
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Granted: 1972-03-07
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Expires: 1990-04-02
Abstract
Abstract A chrominance signal generator comprising two striped filter elements for generating three primary color signals, red and blue signals of which have different frequency, delay circuit means for delaying a part of the composite electric signal derived from said filter elements for one horizontal scanning period, signal processing circuit means including an adder and a subtractor for processing the output signal of said delay circuit and said composite electric signal to obtain the three primary color signals, utilizing the vertical correlation of an image.
Inventors
- 👤 Yoshizumi Eto
- 👤 Masao Hibi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:16
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/03
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
173 words
A chrominance signal generator comprising: at least one color filter structure having subtractive primary color portions; means for scanning and transforming informations supplied from an image through said filter structure into a composite electrical signal wherein the frequency bands of two primary color components overlap with that of the third primary color component; delay circuit means for partially delaying the output of said transforming means, signal processing circuit means for processing the output of said delay circuit means and the output of said transforming means to provide individual chrominance signals; said filter structure including means for preventing passage of a light component of at least one color periodically with respect to the scanning direction, the phase of said period differing from that for n horizontal scanning periods by about pi (where n is a positive integer), said delay circuit means having a delay time that is n times one horizontal scanning period, whereby said plurality of individual chrominance signals are separated from a composite electric signal utilizing the vertical correlation in the image.
Claim 2
Dependent Claim
173 words
A chrominance signal generator comprising: at least one color filter structure having subtractive primary color portions; means for scanning and transforming informations supplied from an image through said filter structure into a composite electrical signal wherein the frequency bands of two primary color components overlap with that of the third primary color component; delay circuit means for partially delaying the output of said transforming means, signal processing circuit means for processing the output of said delay circuit means and the output of said transforming means to provide individual chrominance signals; said filter structure including means for preventing passage of a light component of at least one color periodically with respect to the scanning direction, the phase of said period differing from that for n horizontal scanning periods by about pi (where n is a positive integer), said delay circuit means having a delay time that is n times one horizontal scanning period, whereby said plurality of individual chrominance signals are separated from a composite electric signal utilizing the vertical correlation in the image.
Claim 3
Dependent Claim
32 words
A chrominance signal generator according to claim 1, in which said filter structurE comprises two color filter elements of lattice shape, said filter elements preventing periodically red and blue light components, respectively.
Claim 4
Dependent Claim
31 words
A chrominance signal generator according to claim 1, in which said filter structure comprises a plurality of striped filters, the relative angles of which according to said scanning direction are variable.
Claim 5
Dependent Claim
48 words
A chrominance signal generator according to claim 1, in which said filter structure has a lattice-shaped pattern wherein each pair of adjacent scanning lines produces signals having a difference of pi in their phase, and said delay circuit means has a delay time of one horizontal scanning period.
Claim 6
Dependent Claim
151 words
A chrominance signal generator according to claim 1, in which: said filter structure comprises a first filter element capable of transmitting green and blue components and preventing passage of a red component periodically and a second filter element capable of transmitting green and red components and preventing passage of the blue component periodically; and said signal processing circuit comprises at least an adder and a subtractor for carrying out summation and subtraction of the outputs of said transforming means and said delay circuit means, first and second band-pass filters connected to the output of said subtractor for separating the red and blue components from the output of said subtractor respectively, first and second detectors connected to the outputs of said band-pass filters to form red and blue signals respectively, and matrix circuit means for supplying a green signal from the output of said adder and from said red and blue signals.
Claim 7
Dependent Claim
34 words
A chrominance signal generator according to claim 1, in which red and blue components are detected through said filter structure by said transforming means and the green component is detected through another transforming means.
Claim 8
Dependent Claim
87 words
A chrominance signal generator according to claim 1, in which said signal processing circuit comprises an adder circuit and a subtractor circuit for carrying out summation and subtraction of both the outputs of said transforming means and said delay circuit means, a low-pass filter for deriving the low-frequency component from the output of said subtractor circuit, and another adder circuit for adding the output of said low-pass filter to the output of said adder circuit, thereby improving the resolution in a direction perpendicular to said scanning direction.
Claim 9
Dependent Claim
88 words
A chrominance signal generator according to claim 1, further comprising a low-pass filter for deriving the low-frequency component from the output of said transforming means, said signal processing circuit comprising an adder for summing the output of said transforming means and the output of said delay circuit means, and a high-pass filter for deriving the high-frequency component from the output of said adder, thereby to improve the resolution in a direction perpendicular to said scanning direction by summing the outputs of said low-pass filter and said high-pass filter.
Claim 10
Dependent Claim
27 words
A chrominance signal generator according to claim 1, further comprising band-pass filters for deriving signal components of a desired band from the output of said transforming means.
Claim 11
Dependent Claim
39 words
A chrominance signal generator according to claim 1, wherein said transforming means includes means for recording informations supplied through said filter structure in a monochromatic film and for photographing the information in the film by a image pickup device.
Claim 12
Dependent Claim
44 words
A chrominance signal generator according to claim 1 wherein said filter structure comprises two color filter elements of lattice shape, the pitch of the two filter elements being respectively different, the filter members in each lattice-shaped filter element being disposed in a checkerboard pattern.
Claim 13
Dependent Claim
74 words
A chrominance signal generator according to claim 1 wherein said filter structure comprises a pair of striped filters disposed at angles theta 1 and theta 2 relative to the scanning direction, wherein cos theta 1 d2/d1 cos theta 2 d3/d1 and where d1 is the distance between adjacent scanning lines, d2 is the pitch of the stripes of one filter element and d3 is the pitch of the stripes of the other filter element.
Claim 14
Dependent Claim
71 words
Method for recording chrominance informations of an object for generating chrominance signals in a monochromatic film through at least one filter structure, comprising preventing passage of a light component of at least one color from the object periodically with respect to the scanning direction in such a manner that the phase of said period differs from that for n horizontal scanning periods by about pi (where n is a positive integer).
Claim 15
Dependent Claim
71 words
Method for recording chrominance informations of an object for generating chrominance signals in a monochromatic film through at least one filter structure, comprising preventing passage of a light component of at least one color from the object periodically with respect to the scanning direction in such a manner that the phase of said period differs from that for n horizontal scanning periods by about pi (where n is a positive integer).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |