Digital camera and storage medium for image signal processing for white balance control

Abstract

A CCD captures a subject image having passed through a taking lens and an image processing circuit performs various types of image pre-treatment including gamma correction and white balance on image data corresponding to n lines×m rows output by the CCD. The image processing circuit also performs format processing on the data. The data are then compressed at a compression circuit. The white balance adjustment and the like are implemented in line sequence at a line processing circuit which engages in signal processing in pixel sequence in units of individual lines in the output from the CCD. The image data having undergone the pre-treatment are then subjected to format processing prior to JPEG compression, at a block processing circuit that engages in signal processing in units of individual blocks each ranging over an n×m (N>n, M>m) block. In other words, the signal processing is performed in block sequence.

1 . A digital camera comprising:
 an image-capturing device that captures a subject image having passed through a taking lens and outputs image data;   a white balance adjustment circuit that performs white balance adjustment on the image data output by said image-capturing device;   a white balance fine adjustment coefficient calculation circuit that calculates white balance fine adjustment coefficients based upon image data having undergone white balance adjustment output by said white balance adjustment circuit; and   a white balance fine adjustment circuit that performs white balance fine adjustment on the image data having undergone the white balance adjustment output by said white balance adjustment circuit using said white balance fine adjustment coefficients.