| CPC H04N 25/78 (2023.01) [H04N 25/51 (2023.01); H04N 25/61 (2023.01); H04N 25/616 (2023.01); H04N 25/677 (2023.01)] | 15 Claims |
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1. A photoelectric conversion apparatus comprising
a pixel array including a plurality of effective pixels,
a readout circuit configured to read out a signal of the pixel array, and
a signal processing unit configured to generate a pixel signal by performing correlated double sampling on signals read out by the readout circuit from an effective pixel selected from the plurality of effective pixels, and perform shading correction on the pixel signal, wherein
the readout circuit has a function of reading out a signal of the pixel array with a first gain, and a function of reading out a signal of the pixel array with a second gain different from the first gain,
the readout circuit reads out a noise level with the first gain and reads out an optical signal level with the first gain or the second gain from an effective pixel selected from the plurality of effective pixels for the correlated double sampling, and
in the shading correction, a pixel signal of an effective pixel from which an optical signal level has been read out with the first gain is corrected based on a first correction value, and a pixel signal of an effective pixel from which an optical signal level has been read out with the second gain is corrected based on a second correction value.
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