US4766485A
Expired / Lapsed
US
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Color-difference line-sequence signal processing apparatus
Assignee: Canon Inc
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Filing: 1986-08-07
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Granted: 1988-08-23
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Expires: 2006-08-07
Abstract
Abstract Apparatus is disclosed for processing an incoming video signal having line sequential R-Y and B-Y color difference signals at respective different DC offsets. The apparatus includes first and second memory circuits for receiving the incoming signal and for respective storage of the offsets of the R-Y and B-Y color difference signals. A computing circuit is operative selectively to subtract the contents of the first and second memory circuits from the incoming signal line sequence parts to provide offset-free versions thereof.
Inventors
- 👤 Makoto Takayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:30
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/72
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
92 words
An offset removing device comprising: (a) input means for inputting a color difference line-sequence signal with diverse parts, each having a different offset level during each horizontal period thereof; (b) detecting means for detecting the level during the horizontal blanking period of the signal inputted thereto by said input means and generating an output signal indicative of such different offset levels during alternate cycles of said line-sequence signal; and (c) computing means for subtracting the output signal of said detecting means from the color difference line-sequence signal inputted by said input means.
Claim 2
Dependent Claim
92 words
An offset removing device comprising: (a) input means for inputting a color difference line-sequence signal with diverse parts, each having a different offset level during each horizontal period thereof; (b) detecting means for detecting the level during the horizontal blanking period of the signal inputted thereto by said input means and generating an output signal indicative of such different offset levels during alternate cycles of said line-sequence signal; and (c) computing means for subtracting the output signal of said detecting means from the color difference line-sequence signal inputted by said input means.
Claim 3
Dependent Claim
14 words
A device according to claim 1, wherein said detecting means includes a sample-hold circuit.
Claim 4
Dependent Claim
13 words
A device according to claim 1, wherein said detecting means includes a memory.
Claim 5
Dependent Claim
13 words
A device according to claim 3, wherein said memory includes a digital memory.
Claim 6
Dependent Claim
13 words
A device according to claim 1, wherein said computing means includes an adder.
Claim 7
Dependent Claim
13 words
A device according to claim 1, wherein said computing means includes a subtractor.
Claim 8
Dependent Claim
34 words
A device according to claim 1, wherein said detecting means includes memory means for respectively detecting the offset level during each horizontal blanking period of one such part of the color difference line-sequence signal.
Claim 9
Dependent Claim
56 words
Apparatus for processing a color difference line-sequence signal comprising: (a) two memory means for memorizing the respective levels during a horizontal blanking period of said color difference line-sequence signal and generating output signals indicative thereof; and (b) computing means for selectively substracting said output signals of said two memory means from the color difference line-sequence signal.
Claim 10
Dependent Claim
56 words
Apparatus for processing a color difference line-sequence signal comprising: (a) two memory means for memorizing the respective levels during a horizontal blanking period of said color difference line-sequence signal and generating output signals indicative thereof; and (b) computing means for selectively substracting said output signals of said two memory means from the color difference line-sequence signal.
Claim 11
Dependent Claim
13 words
An apparatus according to claim 8, wherein said memory means include sample-hold circuits.
Claim 12
Dependent Claim
13 words
An apparatus according to claim 8, wherein said memory heans include digital memories.
Claim 13
Dependent Claim
30 words
An apparatus according to claim 8, further comprising switching means for applying one of the output signals of said two memory means to said computing means in each horizontal period.
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) | 1991-08-23 | 1992-02-22 | 1992-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-23 | 1996-02-22 | 1996-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-23 | 2000-02-22 | 2000-08-23 | $7700.00 | Window Closed / Lapsed |