IMAGE COMPRESSING DEVICE, IMAGE DECOMPRESSING DEVICE, IMAGE COMPRESSING METHOD, IMAGE DECOMPRESSING METHOD, AND RECORDING MEDIUM

摘要

Disclosed is an image compressing device that compresses image data, which comprises a feature-pixel determining unit (106) that determines pixels that indicate points at which pixel values change in image data as feature pixels on the basis of pixel values of pixels of the image data in a predetermined direction and the positions of the pixels in the predetermined direction; and an entropy coding unit (109) that performs entropy coding on pixel values and distances stored in a feature-pixel storage unit (107) that stores correspondences of the pixel values of the determined feature pixels with the distances between the feature pixels.