基于数字水印的形状错误隐藏

MPEG-4编码是一种基于对象内容的第二代视频编码方案,将视频根据内容分割成前景对象和背景.视频对象的信息分为形状信息、纹理信息和运动信息,而形状信息是正确解码视频对象的基础.本文针对MPEG-4编码标准中Ⅰ-VOP形状信息的错误进行错误隐藏,有别于传统的曲线插值方法,采用基于鲁棒盲水印的新算法,主要将形状信息作为水印信息进行Arnold置乱变换后嵌入到背景区域中.实验证明,本文提出的方法对于形状信息严重丢失的修复效果较好.

Error concealment for shape in MPEG-4 based watermarking

MPEG-4 is the second generation video coding standard,which extracts the video frame into foreground objects and background based video objects.One video frame is composed of shape information,texture information and motion information.Shape information is the key point to decode texture data and motion data correctly.In this paper,verifying with traditional way to inter-polation in curve,a novel error concealment scheme for I-VOP shape information in MPEG-4 object-based video coding based on robustious watermarking is proposed,in which the shape data of I-VOP are embed into region of background(ROB)before embedding binary mask image is scrambled making use of Arnold transformation.The experiment results indicate that the proposed algorithm get better effects for the situation of strictness lose in sharp information.