Patent ID: 7236529
Filing Date: 2007-06-26
Classification: H04N

Abstract:
1. A video transcoding system for transcoding a video sequence in a discrete cosine transform (DCT) domain, the video sequence including frames and each of the frames including blocks, the system comprising: an input unit configured to receive a video bit-stream including an intra-frame and an inter-frame, the inter-frame having been encoded by motion compensation based on the intra-frame or another inter-frame; a DCT-domain motion compensation unit configured to re-calculate first DCT coefficients for a target block in the inter-frame included in the video bit-stream received by the input unit; and an output unit configured to transmit a transcoded video bit-stream including the first DCT coefficients re-calculated by the motion compensation unit, and wherein the motion compensation unit calculates partial DCT coefficients as the re-calculation of the first DCT coefficients for the target block, using significant ones of second DCT coefficients of neighboring blocks in the inter-frame, wherein the significant ones exclude one or more high-frequency coefficients in the target block.