一种基于脆弱水印的图像错误隐藏算法

摘要

Aiming at the image transmission problem in the environment of the wireless communication channel,an image error concealment algorithm based on fragile watermark is proposed.The image is divided into a number of blocks with the same sizes,Discrete Wavelet Transform is applied to each block in order to produce a lower resolution copy as the watermark of the each block,then scaling,coding and pseudo-random scrambling is done to them for serialization,finally the watermark sequences are embedded into the image in the spatial domain through the space allocation algorithm.At the receiver,the corresponding watermarks are extracted to repair the lost blocks through image error detection.The simulation experiment results show that the proposed algorithm has a better image quality and lower computational complexity.%针对无线通信信道环境下的图像传输问题,提出一种基于脆弱水印的图像错误隐藏算法.将图像分割为若干相同尺寸的宏块,对每个宏块进行离散小波变换以产生一个低解析度的近似图像作为嵌入水印,并通过尺度变换、编码和伪随机置乱以实现水印的序列化,最后使用空间分配算法将水印序列嵌入到图像的空间域中.在接收端通过图像检测以提取相应的水印来修复丢失的宏块.仿真实验证明该算法具有更好的图像修复质量和更低的计算复杂度低.