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中文摘要：
现有交织器结构的图像不等丢包保护方案，通常以期望质量度量系统性能，而没有考虑最小图像质量要求．为此，提出了以有效期望质量，即扣除传输失败情况后接收端得到的期望质量作为系统性能的度量，并在传输失败概率小于给定概率阈值的条件下，分配信源／信道码率以使有效期望质量最大．基于此改进并结合等保护和不等保护策略，提出了一种局部搜索的码率分配算法．采用双状态Markov网络模型，对SPIHT和JPEG2000编码器产生的码流数据进行仿真实验，结果表明，新算法与基于期望质量度量的原算法相比，能有效降低传输失败发生的概率，提高有效期望质量，同时计算复杂度也显著减少．
英文摘要：
The performance of the existing unequal loss protection system based on interleaver structure for progressive image transmission is usually measured by the expected quality without considering the minimum image quality requirement. In this paper, a new objective function named the effective expected quality is proposed, which is defined as the received expected quality excluding the contribution from failure transmission, i.e., the quality of the decoded image is below the minimum quality requirement. The performance criterion proposed is to maximize the effective expected quality under the constraint condition that the probability of failure transmission is below a given threshold. With this new performance criterion and equal and unequal protection strategies, a new local search algorithm is also presented for the allocation of the transmission bit budget between the source and channel codes. Experiments are carried out with the source coders of SPIHT and JPEG2000 by using the network model of two-state Markov. The results show that the new algorithm can provide higher effective expected quality and lower probability of failure transmission with significantly lower computational complexity compared with the previous algorithm.
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