Image signal processor with white balance calculation based upon selected prediction area

摘要

An image signal processor comprising an image signal receiver and a white balance processing block is provided. The image signal receiver receives an image signal. The image signal is generated by an imaging device when the imaging device captures an optical image of an object. The imaging device captures the optical image of the object through a photographic optical system. The photographic optical system has a focus optical system. The focus optical system focuses the optical image on a light receiving surface of the imaging device. The photographic optical system is housed in a lens unit with a detector. The detector finds an object distance based on a location of the focus optical system in the photographic optical system. The white balance processing block carries out a white balance process for the image signal, based on a photographing magnification of the photographic optical system, the object distance, and the light intensity of the optical image as the image signal is generated.