IMAGE-DATA COMPRESSING CIRCUIT, IMAGE-DATA COMPRESSING METHOD, AND PHOTOGRAPHING APPARATUS

摘要

Disclosed is an image-data compression circuit including a difference value calculating unit and an encoding unit. The difference value calculation unit: receives input of pixel values of two adjacent set bits in the same color; and outputs a value based on the difference value of the two pixel values in the set bits after calculating the value by referring to pixel values of optical black. The encoding unit which encodes the value, calculated by the difference value calculating unit based on the difference value, by using variable-length codes which can be instantaneously decoded.