利用單位元轉換加速決策模式與運動評估

Abstract

近幾十年來，數位視訊科技已被廣泛地使用並成為生活中不可或缺的一部分。隨著數位訊號處理的發展，以及對較佳編碼效能的要求，H.264/AVC被認為是次世代的國際視訊編碼標準。。它不僅可有效節省儲存媒體所需的空間，同時也可在現行的通訊環境下允許傳輸更高解析的畫面。伴隨著種種好處而來的就是極之龐大的運算量，而大量的快速演算法也因此應運而生。如何兼顧畫質和運算速度成了當前最重要的課題，而這也是本篇論文的主旨。因此，如何減少複雜度並設計一個高效能的框內編碼器或解碼器，而不會造成太多的效能衰減，是個重要的課題。 根據已出版的文獻，位移估測與模式決策是整個壓縮過程中最為費時的。而單位元轉換的方法被用來減少移動評估的複雜度，我們提出的這篇論文將會把單位元轉換用在模式決策上，進一步去減少計算複雜度，而且不會使的壓縮品質下降。

For the recent decades, digital video technology has been popularly used and become a necessary part in our daily life. With the development of digital signal processing and demand of better coding performance, H.264/AVC is regarded as the international video coding standard for the next generation. Video compression allows the reduction of high-resolution video into a more compact memory space to thereby reduce storage and video processing resources during playback. Along with the benefits is extremely large amount of computation, and a large number of fast algorithms had begun. Thus, how to balance quality and speed of operation becomes the most important issue, which is the subject of this paper. According to the literature published before, we can find that the motion estimation process and mode decision are the most time consumed part. The conversion of One_Bit Plane Transform (OBPT) is used to reduce the complexity of motion estimation. And this paper we proposed will apply the OBPT in mode decision so that the complexity of compression will reduce and it will not make the compression quality declined.