Image processing apparatus which composes a plurality of images shot under different exposure conditions and image processing method

摘要

An image processing apparatus which composes a plurality of images shot under different exposure conditions, comprises a detection unit which detects an exposure error according to a position on a screen using, out of the plurality of images shot under different exposure conditions, an image whose exposure amount is smaller than a predetermined value as a detection target image, a calculation unit which calculates correction information to correct the exposure error detected by the detection unit in accordance with the position on the screen, an adjustment unit which performs level adjustment according to the exposure amount of the detection target image in accordance with the correction information and position information on the screen, and an image composition unit which generates a composite image by composing the plurality of images including the image that has undergone the level adjustment.

主权项

1. An image processing apparatus which composes a plurality of images shot under different exposure conditions, comprising:
a detection unit configured to detect an exposure error of a detection target image according to a position in the detection target image, the detection target image having an exposure amount smaller than a predetermined exposure amount; a calculation unit configured to calculate correction information to correct the exposure error detected by the detection unit; an adjustment unit configured to perform level adjustment on the detection target image in accordance with the exposure amount of the detection target image and the correction information; and an image composition unit configured to generate a composite image by composing the plurality of images including the detection target image that has undergone the level adjustment, wherein the detection unit detects the exposure error by defining, out of the plurality of images, a reference image having an exposure amount not less than the predetermined exposure amount, and comparing the reference image with the detection target image, and wherein the calculation unit calculates the correction information for the detection target image and does not calculate the correction information for the reference image, wherein the image having an exposure amount smaller than the predetermined exposure amount is shot with a shutter speed higher than a predetermined shutter speed and the image having an exposure amount not less than the predetermined exposure amount is shot with a shutter speed not higher than the predetermined shutter speed.