基于数据分割的H.264抗分组丢失不等保护方案

Error Robustness Scheme for H.264 Based on Data Partition and Unequal Error Protection

根据一个GoP(Group of Picture)内不同的数据帧类型由于编码模式不同造成对信源解码后的图像质量影响不同,对H.264编码产生的码流进行基于帧的数据分割(data partition),分成I帧、P帧、B帧3种数据类型。对3种数据类型分别采用不同的码率做LDGM Triangle信道编码,即对H.264码流进行不均等差错保护(Uneaqual Error Protection,UEP),对H.264码流中重要的数据采用较低码率、抗丢包性能更好的LDGM Triangle编码传输,而对不太重要的数据采用较高的码率来保护,以提高H.264的抗丢包算法的性能。仿真结果表明,本文提出的算法对重要数据可以进行较好的丢包保护,使得信源解码后的视频图像峰值信噪比(PSNR)具有较好的稳健性。

According to different frame type using different coded mode in a GoP induced different affection to the quality of the decoded video picture, a new data partition （advanced data partition） method of the encoded H.264 code stream is proposed, which divided the code stream into three data types： Ⅰ frame, P frame and B frame. Then the LDGM triangle channel coded is made by different code ratio, namely the unequal error protection to the H.264 code stream. The high-priority data are given more channel redundancy. Simulation results are compared with the equal error protect scheme, the proposed UEP schemes can protect the important data, and endues the PSNR of the decoded video picture at the receiver with more robustness.