基于分裂系数的多描述编码  

Multiple description coding based on splitting coefficient

作　　者：蔡灿辉[1] 陈婧[1] 丁润涛[2] 

机构地区：[1]华侨大学信息科学与工程学院,福建泉州362011 [2]天津大学电子信息工程学院,天津300072

出　　处：《计算机应用》2005年第5期1066-1068,共3页journal of Computer Applications

基　　金：国家自然科学基金资助项目(60472106);福建省自然科学基金资助项目(A0410018)

摘　　要：提出了一种新的多描述图像编码方案———基于分裂系数的多描述编码。通过对每一个小波系数进行按位下采样,把一个系数分裂为奇数位系数和偶数位系数。奇数位系数信息和偶数位系数保护信息构成一个描述,偶数位系数信息和奇数位系数保护信息构成另一个描述。两个描述通过不同的信道进行传输。由于每个描述都包含了奇数位系数和偶数位系数的部分或全部信息,因此,接收到一个信道的信息就可以重建出一定质量的图像。如果所有的信道传输的信息都被接收,就会得到比任何一个单独信道更好的重建图像。实验结果表明,该算法的性能优于多相变换与选择量化算法。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.

关 键 词：多描述编码 错误恢复 图像传输 按位下采样 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]