Signal processor circuit for endoscope systems of all-pixels readout type
First Claim
1. A signal processor circuit for endoscope systems of an all-pixels readout type comprising:
- an image pickup device having a plurality of color filters arranged per pixel;
an image pickup device driving circuit which controls so as to read out video signals of all the pixels stored for each pixel by the image pickup device with a single exposure;
a clamp circuit which clamps the video signals read out of said image pickup device with a feedback clamp signal;
memories for storing the video signals from said clamp circuit;
a selector circuit which is connected at a stage after said memories, receives a through video signal from a circuit disposed at a stage preceding said memories, and selectively outputs the video signals in said memories and said through video signal; and
a signal processor circuit which is disposed at a stage subsequent to said selector circuit, performs a predetermined processing of the video signals and generates a feedback clamp signal from said through video signal,wherein a feedback clamp signal which is output from said signal processor circuit on the basis of the through video signal is supplied to said clamp circuit.
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Accused Products
Abstract
A signal processor circuit which stabilizes a clamp processing of black levels even in an endoscope system of an all-pixels readout type and prevents image qualities from being degraded at a stage to shift from a still image to a moving image in particular. In this signal processor circuit, video signals of all picture elements obtained with a single exposure are read out of a CCD, odd line data is stored into a first memory, even line data is stored into a second memory, and mixed picture element signals are generated by a mixer circuit, whereafter a predetermined image processing is performed by a first DVP. A clamp circuit and an A/D converter are disposed at stages preceding the first and second memories, a through video signal output from the A/D converter is input into the first DVP by way of a selector circuit on the basis of an optical black pulse and a black level clamp signal generated on the basis of the through video signal is fed back to the clamp circuit. Accordingly, the signal processor circuit can perform a favorable clamp processing without using past data stored in the memories.
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Citations
4 Claims
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1. A signal processor circuit for endoscope systems of an all-pixels readout type comprising:
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an image pickup device having a plurality of color filters arranged per pixel; an image pickup device driving circuit which controls so as to read out video signals of all the pixels stored for each pixel by the image pickup device with a single exposure; a clamp circuit which clamps the video signals read out of said image pickup device with a feedback clamp signal; memories for storing the video signals from said clamp circuit; a selector circuit which is connected at a stage after said memories, receives a through video signal from a circuit disposed at a stage preceding said memories, and selectively outputs the video signals in said memories and said through video signal; and a signal processor circuit which is disposed at a stage subsequent to said selector circuit, performs a predetermined processing of the video signals and generates a feedback clamp signal from said through video signal, wherein a feedback clamp signal which is output from said signal processor circuit on the basis of the through video signal is supplied to said clamp circuit. - View Dependent Claims (2, 3, 4)
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Specification