Patent US5471241A successfully refreshed from Google Patents.
US5471241A
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Image sensing method and apparatus for producing a color video signal and luminance video signal
Assignee: Canon Inc
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Filing: 1994-03-02
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Granted: 1995-11-28
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Expires: 2014-03-02
Abstract
Abstract An image sensing apparatus having a small amount of circuitry and exhibiting little power consumption is characterized in that a required delay line is connected into the circuitry at a point after a gamma-corrector in a digital signal processing system that processes an intensity signal, and another required delay line is connected into the circuitry at a point after a limiter in a corrective-signal generating system, which is for generating a signal that corrects a color signal. As a result, the delay lines are provided in fewer stages and need only have a small bit width. This makes it possible to reduce the amount of circuitry as well as power consumption.
Inventors
- 👤 Teruo Hieda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:41
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/765; H04N5/77; H04N5/772; H04N23/00; H04N23/80; H04N23/84
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
151 words
An image sensing apparatus for producing a color video signal by subjecting an output video signal from a color image sensing element to digital signal processing, comprising: intensity-signal extracting means for extracting an intensity signal from a digital video signal, which is an analog to digital signal converted from the output video signal from the color image sensing element; limiting means for limiting an amplitude of the intensity signal; color-difference signal extracting means for extracting color-difference signals from the digital video signals: synchronization means for synchronizing said intensity signal limited by said limiting means with said color-difference signals extracted by said color difference signal extracting means; gain control means for controlling the color-difference signals based upon said synchronized intensity signal; and video signal producing means for producing a color video signal by cutting predetermined high-frequency components from said color-difference signals controlled by said gain control means into a color video signal.
Claim 2
Dependent Claim
151 words
An image sensing apparatus for producing a color video signal by subjecting an output video signal from a color image sensing element to digital signal processing, comprising: intensity-signal extracting means for extracting an intensity signal from a digital video signal, which is an analog to digital signal converted from the output video signal from the color image sensing element; limiting means for limiting an amplitude of the intensity signal; color-difference signal extracting means for extracting color-difference signals from the digital video signals: synchronization means for synchronizing said intensity signal limited by said limiting means with said color-difference signals extracted by said color difference signal extracting means; gain control means for controlling the color-difference signals based upon said synchronized intensity signal; and video signal producing means for producing a color video signal by cutting predetermined high-frequency components from said color-difference signals controlled by said gain control means into a color video signal.
Claim 3
Dependent Claim
14 words
The apparatus according to claim 1, wherein said synchronizing means comprises a delay circuit.
Claim 4
Dependent Claim
174 words
An image sensing apparatus for producing a luminance video signal by subjecting an output video signal from a color image sensing element to digital signal processing, comprising: analog-to-digital converting means for converting the output video signal of the color image sensing element into a digital video signal; intensity-signal extracting means for extracting an intensity signal from a digital video signal, which is a signal analog-to-digital converted from the output video signal from the color image sensing element; color-difference signal extracting means for extracting color-difference signals from the digital video signal; gain control means for controlling the gain of the color difference signals; gamma-correcting means for gamma-correcting the intensity signal; synchronization means for synchronizing said intensity signal gamma-corrected by said gamma-correcting means with said color-difference signals gain-controlled by said gain control means; and luminance video signal producing means for correcting said intensity signal synchronized by said synchronization means based upon said color-difference signals gain-controlled by said gain control means, and producing a luminance video signal based upon said corrected intensity signal and a blanking signal.
Claim 5
Dependent Claim
174 words
An image sensing apparatus for producing a luminance video signal by subjecting an output video signal from a color image sensing element to digital signal processing, comprising: analog-to-digital converting means for converting the output video signal of the color image sensing element into a digital video signal; intensity-signal extracting means for extracting an intensity signal from a digital video signal, which is a signal analog-to-digital converted from the output video signal from the color image sensing element; color-difference signal extracting means for extracting color-difference signals from the digital video signal; gain control means for controlling the gain of the color difference signals; gamma-correcting means for gamma-correcting the intensity signal; synchronization means for synchronizing said intensity signal gamma-corrected by said gamma-correcting means with said color-difference signals gain-controlled by said gain control means; and luminance video signal producing means for correcting said intensity signal synchronized by said synchronization means based upon said color-difference signals gain-controlled by said gain control means, and producing a luminance video signal based upon said corrected intensity signal and a blanking signal.
Claim 6
Dependent Claim
14 words
The apparatus according to claim 3, wherein said synchronizing circuit comprises a delay circuit.
Claim 7
Dependent Claim
152 words
An image sensing method for producing a color video signal by subjecting an output video signal from a color image sensing element to digital signal processing, comprising: an intensity-signal extracting step of extracting an intensity signal from a digital video signal, which is analog-to-digital signal converted from the output video signal from the color image sensing element; a limiting step of limiting an amplitude of the intensity signal; a color-difference signal extracting step of extracting color-difference signals from the digital video signals; a synchronization step of synchronizing said intensity signal limited by said limiting step with said color-difference signals extracted by said color-difference signal extracting step; a gain control step of controlling the color-difference signals based upon said synchronized intensity signal: a video-signal producing step of producing a color video signal by cutting predetermined high-frequency components from said color difference signals controlled by said gain control step, into a color video signal.
Claim 8
Dependent Claim
152 words
An image sensing method for producing a color video signal by subjecting an output video signal from a color image sensing element to digital signal processing, comprising: an intensity-signal extracting step of extracting an intensity signal from a digital video signal, which is analog-to-digital signal converted from the output video signal from the color image sensing element; a limiting step of limiting an amplitude of the intensity signal; a color-difference signal extracting step of extracting color-difference signals from the digital video signals; a synchronization step of synchronizing said intensity signal limited by said limiting step with said color-difference signals extracted by said color-difference signal extracting step; a gain control step of controlling the color-difference signals based upon said synchronized intensity signal: a video-signal producing step of producing a color video signal by cutting predetermined high-frequency components from said color difference signals controlled by said gain control step, into a color video signal.
Claim 9
Dependent Claim
14 words
The method according to claim 5, wherein said synchronizing step comprises a delay step.
Claim 10
Dependent Claim
178 words
An image sensing method for producing a luminance video signal by subjecting an output video signal from a color image sensing element to digital signal processing, comprising: an analog-to-digital converting step of converting the output video signal of the color image sensing element into a digital video signal; an intensity-signal extracting step of extracting an intensity signal from digital video signal, which is a signal analog-to-digital convened from the output video signal from the color image sensing element; a color-difference signal extracting step of extracting color-difference signals from the digital video signal; a gain control step of controlling the gain of the color-difference signals; a gamma-correcting step of gamma-correcting the intensity signal; a synchronization step of synchronizing said intensity signal gamma-corrected by said gamma-correcting step with said color-difference signals gain-controlled by said gain control step; and a luminance video signal producing step of correcting said intensity signal synchronized by said synchronization step based upon said color-difference signals gain-controlled by said gain-control step, and producing a luminance video signal based upon said corrected intensity signal and a blanking signal.
Claim 11
Dependent Claim
178 words
An image sensing method for producing a luminance video signal by subjecting an output video signal from a color image sensing element to digital signal processing, comprising: an analog-to-digital converting step of converting the output video signal of the color image sensing element into a digital video signal; an intensity-signal extracting step of extracting an intensity signal from digital video signal, which is a signal analog-to-digital convened from the output video signal from the color image sensing element; a color-difference signal extracting step of extracting color-difference signals from the digital video signal; a gain control step of controlling the gain of the color-difference signals; a gamma-correcting step of gamma-correcting the intensity signal; a synchronization step of synchronizing said intensity signal gamma-corrected by said gamma-correcting step with said color-difference signals gain-controlled by said gain control step; and a luminance video signal producing step of correcting said intensity signal synchronized by said synchronization step based upon said color-difference signals gain-controlled by said gain-control step, and producing a luminance video signal based upon said corrected intensity signal and a blanking signal.
Claim 12
Dependent Claim
14 words
The apparatus according to claim 7, wherein said synchronizing step comprises a delay step.
References Cited (Backward Citations)
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