IMAGING APPARATUS

摘要

White balance correction is performed on RGB color signals output from an image pickup device that includes a particular color filter array in which RGB color filters are arranged on respective lines and the ratios of the numbers of RGB color filters are different between the lines. For calculation of WB gains used for the white balance correction, not all the pixels of the image pickup device but prescribed lines are used to thinning-read. The WB gains are calculated based on color signals on the thinning-read prescribed lines. As the prescribed lines to be thinning-read, lines having a small degree of color mixture are selected under an imaging condition (a lens f-number and a zoom position) with a high degree of color mixture; lines having relatively even ratios of the numbers of RGB color filters are selected under an imaging condition having a low degree of color mixture.

主权项

1. An imaging apparatus, comprising:
an imaging optical system; an image pickup device forming a subject image through the imaging optical system and including a color filter array in which color filters including three primary colors are arranged on two-dimensionally arranged photoelectric conversion elements, the color filters of three primary colors are arranged on each line and which includes a plurality of lines that include lines having uneven ratios of the numbers of color filters of the three primary colors and more even lines than the uneven lines; a thinning pattern determination device for determining one thinning pattern according to an imaging condition from among a plurality of thinning patterns for selecting lines to be thinning-read from among the plurality of lines; a white balance gain calculation device for calculating white balance gains on the basis of color signals on lines selected according to the thinning pattern determined by the thinning pattern determination device from among color signals that correspond to the color filters on each line and have been acquired by the image pickup device; and a white balance correction device for performing white balance correction on each of the color signals acquired through the image pickup device on the basis of the white balance gains calculated by the white balance gain calculation device, wherein the thinning pattern determination device determines one thinning pattern from among the plurality of thinning patterns on the basis of at least one of an f-number and an optical zoom magnification of the imaging optical system on imaging.