Image capturing apparatus and defective pixel detection method

An image capturing apparatus comprising:

• an image sensor including a plurality of pixels each having a microlens and a plurality of photoelectric conversion units that share the microlens;
• a first defective pixel detection unit configured to detect a defective photoelectric conversion unit from among the plurality of photoelectric conversion units;
• and
• a second defective pixel detection unit configured to detect a defective pixel from among the plurality of pixels,
• wherein the first defective pixel detection method in which each of the plurality of photoelectric conversion units is sequentially taken as a subject for detection, and whether or not the photoelectric conversion unit of the subject for detection has a defect is determined,
• wherein in the first defective pixel detection method, the first defective pixel detection unit compares an output signal that is output from the photoelectric conversion unit of the subject for detection with first signals, and
• wherein the first signals are output from photoelectric conversion units included in pixels peripheral to the pixel including the photoelectric conversion unit of the subject for detection, each position of each of the photoelectric conversion units included in the peripheral pixels corresponding to a position of the photoelectric conversion unit of the subject for detection with respect to the microlens,
• wherein the second defective pixel detection unit determines defective pixels using a second defective pixel detection method in which each of the plurality of pixels is sequentially taken as a subject for detection and whether or not the pixel of the subject for detection has a defect is determined, and
• wherein in the second defective pixel detection method, the second defective pixel detection unit compares a sum of output signals from the plurality of photoelectric conversion units included in the pixel of the subject for detection with a sum of output signals from the plurality of photoelectric conversion units included in pixels peripheral to the pixel of the subject for detection.