DCT-BASED SCALABLE VIDEO COMPRESSION

摘要

A method of encoding an input video signal for communication over a computer network, the method comprising the steps of: i) dividing each frame into a two-dimensional array of macroblocks; ii) detecting motion between each macroblock of a current frame and the corresponding macroblock of a previous frame, and coding only those macroblocks where motion is detected; iii) replacing all coefficients of non-coded macroblocks with zero coefficients; iv) applying discrete cosine transformation to coded macroblocks; v) reorganizing coefficients into a multi-resolution representation; vi) quantizing the coefficients with a uniform scalar quantizer to produce a significance map; and vii) adaptive arithmetic coding of said signal by encoding the motion information, encoding the significance map, encoding the signs of all significant coefficients, and encoding the magnitudes of significant coefficients, in bit-plane order starting with the most significant bit.