SCALABLE VIDEO CODING AND DECODING METHOD, SCALABLE VIDEO ENCODER AND DECODER FOR IMPROVING VIDEO CODING PERFORMANCE

摘要

PURPOSE: A scalable video coding and decoding method, a scalable video encoder and decoder are provided to improve video coding performance by partially reducing PSNR(Peak Signal to Noise Ratio) values of frames having high PSNR values, which construct a single GOP(Group Of Picture), but increasing PSNR values of frames having low PSNR values. CONSTITUTION: A scalable video encoder for receiving a plurality of video frames to generate a bit stream includes a temporal filter(140), a spatial transformer(150), a weight determination unit(170), a quantizer(160), and a bit stream generator(130). The temporal filter removes temporal redundancy of the frames through motion estimation temporal filtering. The spatial transformer removes spatial redundancy of the frames through spatial transform. The weight determination unit determines a weight such that transform coefficients obtained from sub-bands among transform coefficients acquired by removing temporal redundancy and spatial redundancy of the frames are scaled. The quantizer quantizes the scaled transform coefficients. The bit stream generator generates a bit stream using the quantized transform coefficients.