US4577218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color separating circuit for producing red and black signals
Assignee: Fujifilm Business Innovation Corp
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Filing: 1983-03-18
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Granted: 1986-03-18
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Expires: 2003-03-18
Abstract
Abstract A reading device having two different reading elements for scanning the same portion of an original in different wavelength ranges. A color separating circuit comprises a signal level adjusting circuit for adjusting the levels of picture signals provided by the reading elements so that the levels are equal to each other when white picture data is read. An arithmetic unit obtains a level difference between the picture signals which have been subjected to level adjustment by the signal level adjusting circuit. A/D converters are used for digitizing an output signal of the arithmetic unit and the picture signals provided by the reading elements. A color separation logic circuit subjects three different picture signals outputted by the A/D converters to logic operation for color separation.
Inventors
- 👤 Masami Kurata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:56
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/48; H04N1/486; H04N1/488
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
154 words
A color separating circuit system comprising: a reading device having at least two reading elements for scanning the same portion of an original having picture data in different wavelength ranges, and for providing an unfiltered output picture signal and a filtered output picture signal; signal level adjusting means for adjusting the levels of said output picture signals provided by said reading elements so that said levels are equal to each other when white picture data is read; arithmetic means for obtaining an output difference signal by computing a level difference between said output picture signals which have been subjected to level adjustment by said signal level adjusting means; A/D converters for digitizing respectively said output difference signal of said arithmetic means and said adjusted output picture signals provided by said signal level adjusting means; and a color separation logic circuit for performing the operation of color separation on the outputs of said A/D converters.
Claim 2
Dependent Claim
154 words
A color separating circuit system comprising: a reading device having at least two reading elements for scanning the same portion of an original having picture data in different wavelength ranges, and for providing an unfiltered output picture signal and a filtered output picture signal; signal level adjusting means for adjusting the levels of said output picture signals provided by said reading elements so that said levels are equal to each other when white picture data is read; arithmetic means for obtaining an output difference signal by computing a level difference between said output picture signals which have been subjected to level adjustment by said signal level adjusting means; A/D converters for digitizing respectively said output difference signal of said arithmetic means and said adjusted output picture signals provided by said signal level adjusting means; and a color separation logic circuit for performing the operation of color separation on the outputs of said A/D converters.
Claim 3
Dependent Claim
62 words
The color separating circuit system of claim 1, wherein said output picture signals are analog signals and wherein said signal level adjusting means comprises an automatic gain control circuit for adjusting the analog output levels of each of said reading elements so that each of said levels are equal to each other when white picture data is read by said reading elements.
Claim 4
Dependent Claim
21 words
The color separating circuit system of claim 1, wherein said arithmetic means comprises a differential amplifier producing said output difference signal.
Claim 5
Dependent Claim
116 words
The color separating circuit system of claim 1, wherein said color separation logic circuit comprises an inverter for receiving and inverting the digitized output difference signal from said A/D converter digitizing the output of said arithmetic means to produce a first logic output; and OR circuit for receiving said digitized output difference signal and the digitized level-adjusted filtered output picture signal; and an AND circuit for receiving the output of said OR circuit and the digitized level-adjusted unfiltered output picture signal to produce a second logic output; wherein said first logic output indicates that red is to be recorded or displayed; and wherein said second logic output indicates that black is to be recorded or displayed.
References Cited (Backward Citations)
JPS538159A
Cited
US4479242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |