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首页> 外文会议>Broadband Multimedia Systems and Broadcasting, 2009. BMSB '09 >Bit-plane error recovery of low frequency subbands in JPEG2000
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Bit-plane error recovery of low frequency subbands in JPEG2000

机译：JPEG2000中低频子带的位平面错误恢复

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摘要

Digital image storage and transmission is widely used in consumer products, such as digital cameras and cellular phones, where low bit-rate coding is required. In any low bit-rate encoder, such as the JPEG2000 standard, the data truncation during the encoding process, and data loss during transmission will result in lost bit-planes, which will be normally replaced by zeros at the decoder. In this paper a new algorithm has been proposed that is able to recover the lost/truncated lower bit-planes of transform coefficients in the LL subband of a wavelet transform in a JPEG2000 stream. In the proposed algorithm, the lost bit-planes of wavelet coefficients are recovered according to their distance to edges in four directions. Edges are defined based on the available bit-planes at the decoder. Simulation results indicate that the proposed algorithm achieves up to 3.25 dB improvement with respect to the simple zero-filling data recovery method. Compared to half-filling, another popular error recovery method in JPEG2000, the proposed method achieves a %60 improvement in terms of PSNR.
机译：数字图像存储和传输广泛用于要求低比特率编码的消费产品，例如数码相机和蜂窝电话。在任何低比特率编码器（例如JPEG2000标准）中，编码过程中的数据截断以及传输过程中的数据丢失都会导致丢失位平面，通常在解码器处将其替换为零。在本文中，提出了一种新算法，该算法能够恢复JPEG2000流中小波变换的LL子带中变换系数的丢失/截断的较低位平面。在提出的算法中，根据小波系数的丢失位平面到边缘的四个方向的距离来恢复。边缘是根据解码器上的可用位平面定义的。仿真结果表明，相对于简单的零填充数据恢复方法，该算法可提高3.25 dB。与JPEG2000中另一种流行的错误恢复方法“半填充”相比，该方法在PSNR方面提高了60％。

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