IMAGE PREDICTIVE CODING METHOD, IMAGE PREDICTIVE DECODING METHOD, IMAGE CODING DEVICE, IMAGE DECODING DEVICE, IMAGE CODING PROGRAM,IMAGE DECODING PROGRAMS, AND COMPUTER READABLE RECORD MEDIUM RECORDING THOSE PROGRAMS

摘要

PROBLEM TO BE SOLVED: To correct a prediction signal for an invalid prediction mode to raise a selection probability of the invalid prediction mode having a very small selection probability, in order to improve the coding efficiency.

SOLUTION: A prediction signal generation portion 15 generates a prediction signal from an encoded image signal in a memory 14. An invalid prediction mode determination portion 16 detects an invalid prediction mode from the generated prediction signal for each prediction mode. A prediction signal correction portion 17 corrects the prediction signal in the detected invalid prediction mode. A prediction mode determination portion 18 computes a coding cost for each prediction mode using the corrected prediction signal and selects a prediction mode with a minimum cost. Then, the prediction signal of the selected prediction mode is sent to a subtractor 10, and a prediction mode information is sent to a coding portion 19.

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