METHOD OF REDUNDANT PICTURE CODING USING POLYPHASE DOWNSAMPLING AND THE CODEC USING THE SAME

摘要

A redundant slice coding method based on PD(Polyphase Down-sampling) and a CODEC using the method are provided to adaptively vary the quantity of transmitted DCT(Discrete Cosine Transform) coefficients using the PD based redundant slice coding method to improve error resilience of scalable video coding and coding efficiency. A PD based redundant slice encoder includes a PD coding unit(110), a quantizer(120), and a reference block generator(130). The PD coding unit polyphase-down-samples a residual block corresponding to a current block and a predicted block to reconstruct the residual block into four regions. The quantizer transforms and quantizes at least one of the reconstructed regions. The reference block generator generates a reference picture based on a value obtained by inversely transforming and inversely quantizing the quantized region and then inversely polyphase down-sampling the region.