Patent ID: 6310980
Filing Date: 2001-10-30
Classification: G06T

Abstract:
An encoding apparatus for encoding each of target pixels composing one screen, comprising:a predictor for generating a prediction value by predicting a target pixel value representing a target pixel on the basis of pixels around the target pixel;a difference generator for generating a difference between the prediction value generated by said predictor and the target pixel value;a quantizer for generating a quantized value by quantizing the difference generated by said difference generator;an entropy encoder for generating encoded data by entropy-encoding the quantized value generated by said quantizer; anda quantization controller for selecting one of k quantization methods, which is to be used by said quantizer for every part image composing the one screen,wherein each part image consists of a plurality of pixels, and each of the k quantization methods is a quantization method which makes an error between the difference generated by said difference generator and a quantized value obtained by quantizing the difference using said quantizer fall within a range of -N.sub.m to +N.sub.m, wherein m=1 to k.