Unequal error protected transmission with dynamic classification in H.264/AVC

Jun Wang, Shen Li, K. Shimizu, T. Ikenaga, S. Goto
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引用次数: 3

Abstract

As an efficient error resilient tool in H.264, FMO (Flexible Macroblock Ordering) still has 2 disadvantages: (1) unacceptable bitrate overhead, and (2) unsuitable for widely used UEP (unequal error protected) transmission. In this paper, to overcome these 2 disadvantages, a dynamic FMO classification (DFMOC) is proposed. For disadvantage(l), in DFMOC since lots of MBs in the same slice are placed together, thus the bitrate overhead is smaller. For disadvantage^), DFMOC generates 2 slices and each of them takes unequal priority in transmission by the large and small motion area extraction. After employing LDPC coding for UEP transmission strategy, experiment shows DFMOC has a better error robustness while still keeps less bitrate overhead compared with traditional FMO mode: the PSNR has 1 to 2 db outperforming and the bitrate overhead keeps no more than 5% which is about a half of traditional FMO overhead.
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H.264/AVC中动态分类的不等误码保护传输
FMO (Flexible Macroblock Ordering)作为H.264中一种有效的纠错工具,仍然存在两个缺点:(1)不可接受的比特率开销;(2)不平等纠错保护(UEP)传输不适合广泛使用。为了克服这两个缺点,本文提出了一种动态FMO分类(DFMOC)。对于缺点(1),在DFMOC中,由于同一片中的许多mb放在一起,因此比特率开销较小。对于缺点^),DFMOC产生2个切片,每个切片通过大小运动区域提取在传输中优先级不等。将LDPC编码用于UEP传输策略后,实验表明DFMOC比传统的FMO模式具有更好的错误鲁棒性,同时保持较少的比特率开销:PSNR优于传统的FMO模式1 ~ 2db,比特率开销保持不超过5%,约为传统FMO开销的一半。
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