適用於視訊多點傳播技術上之無比率編碼機制中短碼長LT碼客製化

Abstract

由於短碼長LT碼的解碼行為表現不能藉漸近分析推導，我們研究團隊提出一種以創新的效能評估模型搭配最先進的隨機搜索算法的方式使短碼長LT碼的表現能客製化。而在此研究中，我們的目標是提出一套使用原則讓不同視訊應用下的無比率編碼機制皆可採用這短碼長LT碼客製化技術找到合適的短碼長LT碼。 我們各別針對高階視訊編碼及可調式視訊編碼設計了一個複合碼以說明我們如何根據前置碼的解碼表現及測試影片的位元率-失真特性決定短碼長LT後置碼該以什麼目標需求客製化。

Based on the fact that the decoding performance behavior of Short-Length LT (SLLT) codes cannot be deduced by the asymptotic analysis, our research team proposed a method that employs a novel performance measurement model and state-of-the-art randomized search algorithm in order to customize the performance of these codes. In this study, our objective is to propose the guideline how to employ the SLLT code customization method to find suitable SLLT codes in rateless coding schemes for different video applications. In order to demonstrate the way how to derive the target performance requirements of customized SLLT post-codes from the decoding performance behavior of corresponding pre-codes and the rate-distortion characteristics of the test video clips, we designed two examples consisting in constructing composite codes suitable for H.264/Advanced Video Coding (AVC) and H.264/ Scalable Video Coding (SVC).