在本論文中，我們提出一個針對電腦動畫的視訊編解碼核心。這個編解碼核心是以知名的MPEG-4 ASP (Advance Simple Profile) 視訊編解碼核心XviD為基礎。ASP定義了許多有用的視訊編碼工具；例如,4MV, UMC, QMC, GMC等。因此這裡所提出的視訊編解碼核心能夠達到比MPEG-1及MPEG-2標準更高的壓縮率。 因為電腦動畫通常包含了較為強烈的高頻資訊，以及其色彩組成也較一般自然影像來的單純，在這個視訊編解碼核心中我們針對電腦動畫的特性加入了一些新的壓縮工具，主要包括一個新的壓縮方法及一些選擇壓縮方法的判斷法則。而本編解碼核心依據這些判斷法則來決定是否使用新的壓縮方法以提升畫質及壓縮率。 使用於一般自然影像時，除了壓縮時間可能會些微增加外，本編解碼核心仍可保持和原本的XviD編解碼核心相同的高壓縮率及高畫質。 In this thesis, a video codec for computer animation is proposed. The codec is based on a popular MPEG-4 ASP (Advance Simple Profile) video codec XviD. The ASP defines a lot of useful tools for video compression; for example, 4MV, UMC, QMC, GMC, etc. Thus, the proposed codec can achieve a high compression rate than that of MPEG-1 and MPEG-2 video compression standards achieve. In general, computer animation contains strong high frequency information and organized by simple color patterns; thus the proposed codec also includes several new compression tools to match the properties of computer animation compression. The compression tools mainly consist of a new compression method and several decision rules. The codec applies the new compression scheme according to the decision rules to improve both compression rate and visual quality. For natural videos, the compression time may slightly increase, but the codec maintains the compression rate and visual quality as the ordinary XviD codec.
