Moving image encoding apparatus, moving image decoding apparatus, moving image encoding method, moving image decoding method, moving image encoding program, moving image decoding program, and moving image encoding/decoding system

Abstract

In encoding / decoding of moving images, the efficiency of encoding is enhanced and the expansion is facilitated, while the increases in the capacities of frame memories and in bands are suppressed. A bit length expanding converter (102) converts a target image, the pixel values of which are expressed by use of a bit length (N), to an image the pixel values of which are expressed by use of a bit length (M). A compressor (110) encodes the image converted. A decompressor (111) decompresses the image encoded. A bit length contracting converter (113) converts the image decompressed to a reproduced image the pixel values of which are expressed by use of a bit length (L) shorter than the bit length (M). The reproduced image is then stored, as a reference image, into a frame memory (114).

Description

technical field [0001] The present invention relates to a dynamic image coding device, a dynamic image decoding device, a dynamic image encoding method, a dynamic image decoding method, a dynamic image encoding program, a dynamic image decoding program, and a dynamic image encoding and decoding system for encoding and decoding dynamic images. In particular, a technique associated with the bit length of each pixel of an image processed in encoding and decoding processing. Background technique [0002] In order to efficiently transmit and store video data, compression coding techniques are used. In the case of moving images, MPEG1, 2, 4, and H.261 to H.264 systems are widely used. [0003] In order to improve coding efficiency, an image to be coded is divided into a plurality of blocks, and then predictive coding and decoding are performed. Specifically, an image of one frame is divided into block regions composed of 16×16 pixels. In the intra-frame predictive encoding meth...

AI Technical Summary

Problems solved by technology

Therefore, there is a problem in the ease of expansion due to the high installation and processing costs associated with the addition of new processing such as image processing

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