Transform vector quantization: a

摘要

Abstract: This article presents a coding scheme using variable block-size transform coding together with vector quantization (VQ) called variable block-size transform vector quantization (VBSTVQ). The VBSTVQ shows a satisfying picture quality at bitrates of about 0.3 - 0.6 bit/pel (coding of the luminance signal only). The coding scheme is well suited for multimedia, computer, and distribution applications due to its asymmetry in complexity and its inherent hierarchical structure. The picture is segmented into rectangles of different sizes. These rectangles are transformed by a two-dimensional DCT and coded by VQ based on analysis in the spatial and transform domain. A decomposition scheme of the rectangles into vectors which is adapted to non- stationary signals like edges is introduced. Computer simulations compare the results of constant and variable blocksize TVQ. !26