关键词: 多描述编码, 错误恢复, 图像传输, 按位下采样

Abstract: A new multiple description coding scheme, multiple description coding based on splitting coefficient was proposed. First, each significant wavelet coefficient was split into odd position and even position coefficients by bitwise down sample, where the odd position coefficient was made from the bits in the odd positions, whereas the even position one was made from the bits in the even positions. The coded odd position coefficients and the protecting data for the even position coefficients formed one description, and the coded even position coefficients and the protecting data for the odd position coefficients formed the other description. Two descriptions were dispatched from different channels. Since each description included part or all information of the odd and even position coefficients, the reconstructed image from any single channel would have acceptable fidelity. The reconstructed image was of much better quality if both channels were available. Simulation results verified the performance of the proposed algorithm better than that of the polyphase transform and selective quantization.

Key words: multiple description coding, error resilience, image transmission, bitwise down sample