IMAGE ENCODING AND DECODING METHOD AND APPARATUS

摘要

PURPOSE: An image encoding method and apparatus are provided to let a prediction block generator calculate a final correction value by performing arithmetic right shift of an initial correction value by a binary digit 1, thereby reducing computational complexity. CONSTITUTION: A prediction block generator (120) generates a prediction block by performing intra prediction for a current block. An entropy-decoding unit encodes a residual block left after taking away the prediction block from an original image. The prediction block generator generates a final prediction value base on a first prediction value of a prediction target pixel included in the current block and a final correction value. The final correction value is calculated by performing arithmetic right shift of an initial correction value of the prediction target pixel by a binary digit 1. [Reference numerals] (111) Motion prediction unit; (112) Motion compensation unit; (120) Intra prediction unit; (130) Conversion unit; (140) Quantization unit; (150) Entropy encoding unit; (160) Inverse quantization unit; (170) Inverse conversion unit; (180) Filter unit; (190) Reference image buffer; (AA) Input image; (BB) Inter; (CC) Intra; (DD) Bit stream