英语翻译Residual coefficients are primarily the transform coefficients of the difference between a macroblock and its motioncompensated version,after they have been quantized and entropy coded.Our experiments have shown that theseresidual coeffic

英语翻译Residual coefficients are primarily the transform coefficients of the difference between a macroblock and its motioncompensated version,after they have been quantized and entropy coded.Our experiments have shown that theseresidual coeffic
英语翻译
Residual coefficients are primarily the transform coefficients of the difference between a macroblock and its motion
compensated version,after they have been quantized and entropy coded.Our experiments have shown that these
residual coefficients do carry a certain amount of “residual visual information” that may convey to an adversary the
content of the compressed video if not properly secured.Thus,it becomes necessary to encrypt the residual information.
Figure 2 shows that without having to decoding the reference frame or motion vectors,the luma residue coefficients of a
P frame will provide an adversary a delineation of the original frame.Therefore,we need to protect the residual
coefficients.However,further experiments reveal that not all of the luma and chroma coefficients need to be secured.
Figure 3 demonstrates the effect of scrambling all the residual luma and chroma DC coefficients of a P frame when its
motion vectors and reference frame have not been encrypted.As can be seen,for the most part encrypting the DC
coefficients was sufficient to obscure many of the details in the frame.Any information that did leak through was due to
unsecured motion vectors and reference frame.

英语翻译Residual coefficients are primarily the transform coefficients of the difference between a macroblock and its motioncompensated version,after they have been quantized and entropy coded.Our experiments have shown that theseresidual coeffic
剩余系数主要是变换系数的区别宏及其运动
赔偿版本后,他们已量化和熵编码.我们的实验显示,这些
剩余系数不进行一定数额的"剩余视觉信息"可能转达一个对手了
内容压缩视频,如果没有适当的安全.因此,有必要进行加密残余信息.
图2表明,无需解码参照系或运动矢量,亮度残留系数一
P帧将提供一个对手划分的原有框架.因此,我们必须保护残
系数.但是,进一步的实验表明,并非所有的亮度和色度系数须有担保.
图3显示的效果扰所有剩余亮度和色度DC系数的一个P帧时,其
运动矢量和参考帧没有加密.从中可以看出,在大多数情况加密直流
系数足以掩盖很多细节在框架.任何信息,并通过泄漏是由于
无担保运动矢量和参考帧.