| Summary: | 碩士 === 國立雲林科技大學 === 電機工程系碩士班 === 93 === How to get a balance among the bit-rate, the power-consumption, and the error robustness is a very difficult problem in the wireless video transmission field.
After analyzing many H.264 error resilience tools, we find a common defect which the bit-rate will drastically increase with the robustness of error resistance and proposed an Average 3-point sub-sample(A3_45) based multiple description coding(MDC) technique to improve the compression capability by saving the inter-pixel redundancy rather than reduce it in the ordinary spatial sub-sample method.
Besides that, the characteristic of the Average 3-point sub-sample(A3_45) based multiple description coding(MDC) technique is suitable for Pixel-wise error concealment which can have more exquisite video than Block-wise error concealment.
In addition, we find that even with only two compression descriptions, we can efficiently decrease the power-consumption without sacrificing the visual quality.
As experiment results show, we can verify that H.264 SS MDC proposed in this thesis have almost 50% lower bit-rate than direct sub-sample method and efficiently decrease up to half the power-consumption. Especially when packets are lost, pixel-wise error concealment can cause much better visual quality.
|
|---|
