This paper proposes error resilient encoding method based on wavelet transform and vector quantization to decompose and reconstruct the digital multimedia video image.The smoothness of wavelet transform can eliminate visual redundancy.The vector quantization for image after decomposition is obtained,and mean variance method and similar scalar optimal quantization method are used to select and calculate the image vector.Moreover,the overcomplete dictionary of multimedia video image is constructed and normalized.Finally,asymmetric atom is used to perform the sparse decomposition on the multimedia video image,so that a linear representation of image is obtained.According to the above operation,the distribution range and regularity of pixels can be nastered,thus error resilient encoding is realized.Simulation results prove that the proposed method can improve the speed of error resilient coding and the quality of video image transmission.%对数字式多媒体视频图像的编码,能够有效提升视频图像传输质量.数字式多媒体视频图像容错编码的传输,需要对数字式多媒体视频图像进行稀疏分解,得到图像线性形式,完成视频图像容错编码传输.传统方法基于人眼视觉特性进行容错编码,但忽略了得到数字式多媒体视频图像的线性形式,导致编码传输效果不理想.提出基于小波变换和矢量量化的容错编码方法,对数字式多媒体视频图像进行分解和重构,小波变换的平滑性能够去除视觉冗余;对分解后的图像进行矢量量化,分别采用均方差法和类似标量最佳量化法选取和计算图像矢量,构建数字式多媒体视频图像的过完备库,并对其进行归一化处理;采用非对称原子对数字式多媒体视频图像进行稀疏分解,得到图像的一个线性表示.根据上述操作即可掌握像素点的分布范围和规律,实现容错编码.实验证明,所提方法不仅能够提高容错编码的速度,还能够提高视频图像传输质量.
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