Image pickup apparatus and image processing method

An image pickup apparatus comprising:

• a pixel region in which a plurality of pixels each including one microlens and a plurality of photoelectric conversion devices are two-dimensionally arranged in a unit of row, the pixel region comprising a light-shielding region having a plurality of light-shielded rows and an effective region having a plurality of rows to which light reaches;
• a reading circuit configured to read, from each pixel in a first row of each of the light-shielding region and the effective region, a pixel signal obtained by adding all signals of the plurality of photoelectric conversion devices, and to read, from each pixel in a second row of each of the light-shielding region and the effective region, a plurality of signals including phase difference information;
• a horizontal streak correction circuit configured to perform one of a first offset correction and a second offset correction on the pixel signal read from the first row of the effective region, the first offset correction being based on the pixel signal read from the first row of the light-shielding region and the plurality of signals read from the second row of the light-shielding region, the second offset correction being based on a value determined in advance;
• and
• an image processing circuit configured to perform image processing on image data according to a parameter, the image data being configured based on the pixel signal subjected to the first offset correction or the second offset correction and the pixel signal obtained from the plurality of signals read from the second row of the effective region,
• wherein the horizontal streak correction circuit selects which of the first offset correction and the second offset correction to perform, according to the parameter.

An image processing method comprising:

• reading a pixel signal obtained by adding all signals of a plurality of photoelectric conversion devices, from each pixel in a first row of each of a light-shielding region and an effective region in a pixel region in which a plurality of pixels each including one microlens and the plurality of photoelectric conversion devices are two-dimensionally arranged in a unit of row, the pixel region comprising the light-shielding region having a plurality of light-shielded rows and the effective region having a plurality of rows to which light reaches;
• reading a plurality of signals including phase difference information from each pixel in a second row of each of the light-shielding region and the effective region;
• performing one of a first offset correction and a second offset correction on a pixel signal obtained from the plurality of signals read from the second row of the effective region, the first offset correction being based on the pixel signal read from the first row of the light-shielding region and the plurality of signals read from the second row of the light-shielding region, the second offset correction being based on a value determined in advance;
• performing image processing on image data according to a parameter, the image data being configured based on the pixel signal subjected to the first offset correction or the second offset correction and the pixel signal read from the first row of the effective region, and
• selecting which of the first offset correction and the second offset correction to perform, according to the parameter.