Image sensing apparatus, image sensing system and focus detection method of detecting a focus position of a lens using image signal pair

摘要

An image sensing apparatus including: an image sensor including a plurality of focus detection pixel pairs that perform photoelectric conversion on each pair of light beams that have passed through different regions of a photographing lens and output an image signal pair; a flash memory that stores shift information on relative shift between an optical axis of the photographing lens and a central axis of the focus detection pixel pairs; a correction unit that corrects a signal level of the image signal pair based on the shift information and exit pupil information of the photographing lens so as to compensate for an unbalanced amount of light that enters each of the focus detection pixel pairs; and a focus detection unit that detects a focus of the photographing lens using the image signal pair corrected by the correction unit.

主权项

1. An image sensing apparatus which is able to detect a focus position of a lens using image signal pair, comprising:
an image sensor configured to generate an image signal for detecting the focus position; and a correction unit configured to correct a signal level of the image signal based on correction information, wherein the correction information is related to a light amount, which changes in response to an image height and a production error which includes an alignment error at a time of manufacturing the image sensor.