Packet loss concealment in baseline JPEG coded images

S. Shirani, F. Kossentini, R. Ward
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引用次数: 2

Abstract

Loss of coded data can affect a JPEG decoded image to a large extent, making concealment of errors caused by data loss an important issue. Reconstruction of JPEG coded images in an error-prone channel environment is investigated in this paper. First a method for estimating the missing DC coefficients of a JPEG coded image which is required for decoding the compressed image, is suggested and evaluated. As the effects of errors in estimating the missing DC value will appear as stripes across the image, a post-processing technique for removing such stripes is then developed. Finally the missing data is reconstructed by exploiting the correlation between adjacent blocks. A novel reconstruction technique which has a good performance in reconstruction of edges is proposed. A key contribution of our work is that, unlike in previously published reconstruction algorithms, differential encoding of the DC coefficients is assumed. Simulation results indicate that the performance of our algorithm is very good, even when many packets are lost during transmission of the JPEG coded image.
基线JPEG编码图像中的丢包隐藏
编码数据的丢失会在很大程度上影响JPEG解码图像,因此数据丢失导致的错误隐藏成为一个重要问题。研究了JPEG编码图像在易出错信道环境下的重构问题。首先提出了一种估计JPEG编码图像的缺失DC系数的方法,该方法是解码压缩图像所必需的。由于估计缺失DC值的误差的影响将在图像上显示为条纹,因此开发了一种去除这种条纹的后处理技术。最后利用相邻块间的相关性对缺失数据进行重构。提出了一种新的边缘重建方法,该方法具有良好的边缘重建性能。我们工作的一个关键贡献是,与以前发表的重建算法不同,假设DC系数的差分编码。仿真结果表明,即使在JPEG编码图像传输过程中丢失大量数据包的情况下,我们的算法仍然具有很好的性能。
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