US5319451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color signal processing apparatus using a common low pass filter for the luminance signal and the color signals
Assignee: Canon Inc
•
Filing: 1992-12-16
•
Granted: 1994-06-07
•
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 10:39
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.
References Cited (Backward Citations)
US4016598A
Cited
US4751567A
Cited
US4652928A
Cited
US4716455A
Cited
US4663661A
Cited
US4821223A
Cited
US4789890A
Cited
US4858004A
Cited
US4982354A
Cited
JPH01320811A
Cited
US4882628A
Cited
US4961110A
Cited
US5049983A
Cited
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 |