METHOD AND DEVICE FOR ENCODING IMAGE

摘要

PROBLEM TO BE SOLVED: To provide a device for encoding an image which selects optimum orthogonal transform by considering redundancy in a time direction of a predicted residual error.

SOLUTION: The device for encoding an image comprises: a predictor 101 for generating predicted residual images in encoding object regions in common positions between encoding object images without being mutually referenced; a selection part for selecting a two-dimensional mode for executing two-dimensional orthogonal transform to each predicted residual image or a three-dimensional mode for executing three-dimensional orthogonal transform to a three-dimensional predicted residual image comprising three-dimensional predicted residual images; a two-dimensional orthogonal transform part 104b for executing two-dimensional orthogonal transform to each predicted residual image by the two-dimensional mode selection; three-dimensional orthogonal transform parts 104a, 104b for executing three-dimensional orthogonal transform to a three-dimensional predicted residual image by three-dimensional mode selection; a quantizer 106 for quantizing a two- or three-dimensional orthogonal conversion coefficient; an encoder 108 for subjecting the quantized coefficient to variable-length encoding; and a multiplexer for outputting orthogonal conversion mode information representing a selected conversion mode and multiplexed encoded data of the encoded conversion coefficient.

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