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US5333070A
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Apparatus for adjusting hue, chrominance, and luminance of a video signal using matrix circuits
Assignee: Fujifilm Corp
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Filing: 1992-03-25
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Granted: 1994-07-26
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Expires: 2012-03-25
Abstract
Abstract Disclosed herein is an apparatus for carrying out color correction on a video signal. The apparatus basically comprises a Y/C separating circuit for separating the video signal into a luminance signal and a color signal, a decoder for decomposing these signals into color separation signals, three three-row/three-column type color-correcting matrix circuits for electrically processing the color separation signals for color correction, an A/D converter circuit for converting the so-processed signals into digital signals, a frame memory for storing the digital signals therein as data, a correction circuit and a printer head. By using the apparatus referred to above, a user can emphatically perform correction on the hue, chroma and luminance of each of specific colors. Thus, the user can adjust the quality of an image with extreme ease.
Inventors
- 👤 Koji Ichikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:11
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N9/00; H04N9/64; H04N9/643; H04N9/68
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
126 words
An apparatus for processing a video signal for color correction comprising: a first color-correcting matrix circuit for converting a signal of an RGB coordinate system based on an input video signal into a signal of an SfY coordinate system comprising a skin color S, a green color f, and a luminance Y; a second color-correcting matrix circuit for correcting said converted signal so that the colors S and f in said SfY coordinate system provide desired hue, chrominance, and luminance, respectively, said second color-correcting matrix circuit including coefficient adjusting means for altering matrix coefficients in said second color-correcting matrix circuit during correction of said converted signal; and a third color-correcting matrix circuit for converting said corrected converted signal into a signal of said RGB coordinate system.
Claim 2
Independent Claim
126 words
An apparatus for processing a video signal for color correction comprising: a first color-correcting matrix circuit for converting a signal of an RGB coordinate system based on an input video signal into a signal of an SfY coordinate system comprising a skin color S, a green color f, and a luminance Y; a second color-correcting matrix circuit for correcting said converted signal so that the colors S and f in said SfY coordinate system provide desired hue, chrominance, and luminance, respectively, said second color-correcting matrix circuit including coefficient adjusting means for altering matrix coefficients in said second color-correcting matrix circuit during correction of said converted signal; and a third color-correcting matrix circuit for converting said corrected converted signal into a signal of said RGB coordinate system.
Claim 3
Dependent Claim
28 words
The apparatus for processing a video signal for color correction according to claim 1, wherein said first through third color-correcting matrix circuits each comprise a three-row/three-column type matrix.
Claim 4
Dependent Claim
33 words
The apparatus for processing a video signal for color correction according to claim 1, wherein said third color-correcting matrix circuit comprises a matrix indicative of the inverse of said first color-correcting matrix circuit.
Claim 5
Dependent Claim
38 words
The apparatus for processing a video signal for color correction according to claim 1, wherein said second color-correcting matrix circuit outputs the same signal as an input signal applied thereto when the input signal is an achromatic signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-25 | 1998-01-24 | 1998-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-25 | 2002-01-24 | 2002-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-25 | 2006-01-24 | 2006-07-26 | $7700.00 | Window Closed / Lapsed |