Solid-state imaging device and camera system
First Claim
1. A solid-state imaging device comprising:
- a pixel unit in which pixels that perform photoelectric conversion are arranged in an optical black region and a valid pixel region;
a readout processing unit that applies, to a readout signal of the pixel unit, readout processing corresponding to a reference signal subjected to clamp processing; and
a clamp processing unit that clamps, referring to a readout signal level in the optical black region, a reference signal in the valid pixel region with an acquired clamp value, which is a value with which the signal level is reduced to zero, whereinthe clamp processing unit acquires, when information concerning readout is changed, a clamp value predicted from the clamp value before the change and a ratio of charge accumulation times before and after the change, andthe readout processing unit performs first signal readout processing after the change with a reference signal clamped by the predicted clamp value.
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Abstract
A solid-state imaging device includes: a pixel unit in which pixels that perform photoelectric conversion are arranged in an optical black region and a valid pixel region; a readout processing unit that applies, to a readout signal of the pixel unit, readout processing corresponding to a reference signal subjected to clamp processing; and a clamp processing unit that clamps, referring to a readout signal level in the optical black region, a reference signal in the valid pixel region with an acquired clamp value, which is a value with which the signal level is reduced to zero. The clamp processing unit acquires, when information concerning readout is changed, a clamp value predicted from the clamp value before the change and a ratio of charge accumulation times before and after the change, and the readout processing unit performs first signal readout processing after the change with a reference signal clamped by the predicted clamp value.
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Citations
8 Claims
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1. A solid-state imaging device comprising:
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a pixel unit in which pixels that perform photoelectric conversion are arranged in an optical black region and a valid pixel region; a readout processing unit that applies, to a readout signal of the pixel unit, readout processing corresponding to a reference signal subjected to clamp processing; and a clamp processing unit that clamps, referring to a readout signal level in the optical black region, a reference signal in the valid pixel region with an acquired clamp value, which is a value with which the signal level is reduced to zero, wherein the clamp processing unit acquires, when information concerning readout is changed, a clamp value predicted from the clamp value before the change and a ratio of charge accumulation times before and after the change, and the readout processing unit performs first signal readout processing after the change with a reference signal clamped by the predicted clamp value. - View Dependent Claims (2, 3, 4, 5)
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6. A camera system comprising:
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a solid-state imaging device; an optical system that focuses a subject image on the solid-state imaging device; and a signal processing circuit that processes an output image signal of the solid-state imaging device, wherein the solid-state imaging device includes a pixel unit in which pixels including photoelectric conversion elements are arranged in an optical black region and a valid pixel region, a readout processing unit that applies, to a readout signal of the pixel unit, readout processing corresponding to a reference signal subjected to clamp processing, and a clamp processing unit that clamps, referring to a readout signal level in the optical black region, a reference signal in the valid pixel region with an acquired clamp value, which is a value with which the signal level is reduced to zero, and the clamp processing unit acquires, when information concerning readout is changed, a clamp value predicted from the clamp value before the change and a ratio of charge accumulation times before and after the change, and the readout processing unit performs first signal readout processing after the change with a reference signal clamped by the predicted clamp value. - View Dependent Claims (7, 8)
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Specification