Patent US5319451A successfully refreshed from Google Patents.
US5319451A
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US
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Color signal processing apparatus using a common low pass filter for the luminance signal and the color signals
Assignee: Canon Inc
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Filing: 1992-12-16
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Granted: 1994-06-07
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Expires: 2012-12-16
Abstract
Abstract A color signal processing apparatus for processing signals from a color signal-plate sensor having an offset sampling filter array and obtaining a luminance signal and a plurality of color signals, wherein a vertical and/or horizontal low-pass filter is used in common for both the luminance signal and the plurality of color signals. The low-pass filter preferably includes a shift register having a stage number equal to the number of pixels of the sensor in the horizontal direction, and a switch for alternately selecting a zero signal and data, and the vertical low-pass filtering is performed digitally.
Inventors
- 👤 Takashi Sasaki
- 👤 Toshihiko Mimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:47
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/80; H04N23/84; H04N23/843; H04N25/00; H04N25/10; H04N25/11; H04N25/13; H04N25/135; H04N25/136; H04N2209/00; H04N2209/04; H04N2209/041; H04N2209/042; H04N2209/045; H04N2209/046
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
147 words
A color signal processing apparatus for processing signals from a color single-plate sensor and obtaining a luminance signal from a first digital processing and a plurality of color signals from a second digital processing, comprising: a common digital low-pass filter, for filtering both the luminance signal and the plurality of color signals, said common digital low-pass filter performing a digital processing which is common to both said first and second digital processings; and a plurality of non-common digital low-pass filters for filtering the luminance signal and the plurality of color signals respectively, said plurality of non-common digital low-pass filters respectively performing a digital processing which is not common to said first and second digital processings, wherein said common digital low-pass filter and said non-common digital low-pass filters constitute a first two-dimensional filter for the luminance signal and a second two-dimensional filter for the plurality of color signals.
Claim 2
Dependent Claim
147 words
A color signal processing apparatus for processing signals from a color single-plate sensor and obtaining a luminance signal from a first digital processing and a plurality of color signals from a second digital processing, comprising: a common digital low-pass filter, for filtering both the luminance signal and the plurality of color signals, said common digital low-pass filter performing a digital processing which is common to both said first and second digital processings; and a plurality of non-common digital low-pass filters for filtering the luminance signal and the plurality of color signals respectively, said plurality of non-common digital low-pass filters respectively performing a digital processing which is not common to said first and second digital processings, wherein said common digital low-pass filter and said non-common digital low-pass filters constitute a first two-dimensional filter for the luminance signal and a second two-dimensional filter for the plurality of color signals.
Claim 3
Dependent Claim
58 words
A color signal processing apparatus according to claim 1, wherein said common digital low-pass filter comprises a shift register having a number of stages equal to the number of pixels of said single plate sensor in the horizontal direction, and a switch for alternately selecting a zero signal and data, the common digital low-pass filtering being performed digitally.
Claim 4
Dependent Claim
23 words
A color signal processing apparatus according to claim 1, wherein said color single-plate sensor includes a CCD sensor having an offset pixel structure.
Claim 5
Dependent Claim
43 words
A color signal processing apparatus according to claim 3, wherein signals from said single-plate sensor are obtained by scanning in a zigzag fashion over odd and even lines, and wherein the final signals to be outputted from said single plate sensor are interlaced.
Claim 6
Dependent Claim
20 words
A color signal processing apparatus according to claim 1, further comprising a color filter disposed adjacent said color single-plate sensor.
Claim 7
Dependent Claim
18 words
A color signal processing apparatus according to claim 5, wherein said color filter includes a complementary color filter.
Claim 8
Dependent Claim
18 words
A color signal processing apparatus according to claim 5, wherein said color filter includes a pure color filter.
Claim 9
Dependent Claim
38 words
A color signal processing apparatus according to claim 1, wherein each of the digital low-pass filters includes a plurality of delay means and addition means for adding outputs of said plurality of delay means with a predetermined weighing.
Claim 10
Dependent Claim
106 words
A color signal processing apparatus comprising: an FIR type digital low-pass filter for commonly filtering a luminance signal and three color signals provided from a color single-plate sensor having an offset sampling filter array or stripe filter array; a first adder for adding together signals at every (3i+1)-th tap of said digital low-pass filter; a second adder for adding together signals at every (3i+2)-th tap of said digital low-pass filter; a third adder for adding together signals at every (3i)-th tap of said digital low-pass filter; and means for sequentially switching the outputs of said first, second and third adders to output said three color signals.
Claim 11
Dependent Claim
106 words
A color signal processing apparatus comprising: an FIR type digital low-pass filter for commonly filtering a luminance signal and three color signals provided from a color single-plate sensor having an offset sampling filter array or stripe filter array; a first adder for adding together signals at every (3i+1)-th tap of said digital low-pass filter; a second adder for adding together signals at every (3i+2)-th tap of said digital low-pass filter; a third adder for adding together signals at every (3i)-th tap of said digital low-pass filter; and means for sequentially switching the outputs of said first, second and third adders to output said three color signals.
Claim 12
Dependent Claim
18 words
A color signal processing apparatus according to claim 9, wherein said color single-plate sensor includes a CCD sensor.
Claim 13
Dependent Claim
50 words
A color signal processing apparatus according to claim 9, wherein said color single-plate sensor has an offset sampling filter array, wherein signals from the sensor are obtained by scanning in a zigzag fashion over odd and even lines, and wherein final signals to be outputted from the sensor are interlaced.
Claim 14
Dependent Claim
19 words
A color signal processing apparatus according to claim 9, wherein the color single-plate sensor includes a pure color filter.
Claim 15
Dependent Claim
19 words
A color signal processing apparatus according to claim 9, wherein the color single-plate sensor includes a complementary color filter.
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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) | 1997-06-06 | 1997-12-06 | 1998-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-06 | 2001-12-06 | 2002-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-06 | 2005-12-06 | 2006-06-07 | $7700.00 | Window Closed / Lapsed |