PICTURE ENCODER, PICTURE DECODER, PICTURE ENCODING METHOD, PICTURE DECODING METHOD, PICTURE ENCODING PROGRAM RECORDING MEDIUM, AND PICTURE DECODING PROGRAM RECORDING MEDIUM

摘要

Image signals or shape signals are encoded more efficiently than conversion techniques. A changed-picture element detector (2) receives an input signal (1) and detects such a picture element that changes in binary picture element value. A changed-picture element predictor (4) reads a reference image stored in a memory (3) and predicts changed picture elements of the input signal (1). A differential value calculator (5) subtracts the output of the predictor (4) from the output of the detector (2) and a differential value rounding device (7) compares an allowance value (e) with a predicted error (D) and outputs a minimum value (x) (D-e