Macroblock-level Reduced Resolution Video Coding Allowing Adaptive DCT Coefficients Selection

—Reduced Resolution Update (RRU) video coding provides a better compression performance than H.264/AVC does. It is implemented by encoding the predicted residuals after downsampling at the encoder and at the decoder, they will be upsampled to the full-resolution size while motion compensation prediction signal are still yielded in the full-resolution spatial domain. In this paper, we first extend the frame-level RRU to the macroblock-level to obtain better coding performance than the frame-level RRU. Furthermore, we propose a novel macroblocklevel reduced resolution coding scheme which adaptively selects the part of DCT coefficients in the zigzag scan order to obtain better coding efficiency in terms of rate distortion performance. Experimental results exhibit that the proposed methods can achieve obvious improvements in both compression efficiency and decoding complexity compared with the frame-level RRU and H.264/AVC.

• Type: Conference
• Year: 2007
• Where: ISCAS
• Authors: Qiang Hao, Xiangyang Ji, Qingming Huang, Debin Zhao, Wen Gao, Xilin Chen
• Keywords: Better Coding Performance, Better Compression Performance, Frame-level Rru, ISCAS 2007