Abstract: A post-filtering method is disclosed for eliminating jagged effects of computer graphic image before outputing graphic image in accordance with the characteristics of each of the pixels to determine if it needs to perform filtering to the pixel. The method includes the following steps: (a) judging if the pixel's Z-value is equal to zero, if it is, then not perform filtering to the pixel; (b) if the pixel's Z-value is not equal to zero, then judging if the pixel is located at the intersection of the Z-plane, if it is, then performs filtering to the pixel; (c) if the pixel is not located at the intersection of the Z-plane, then judging if the pixel is located at the constant-Z plane, if it is not, then not perform filtering to the pixel; and (d) if the pixel is located at the constant-Z plane, then judging if the pixel's color variation value is greater than the threshold value, if it is, then performs filtering to the pixel.

Abstract: The invention provides a method and an apparatus for dithering, and inversely dithering an image. The apparatus makes use of a pixel address and a pixel data to locate a dither reference value from a dither matrix and use the dither reference value to convert an original pixel data having N bits into a dithered pixel data having M bits (N>M). On the other hand, the apparatus for performing an inversely dithering process makes use of the pixel address and the dithered pixel data (M bits) to locate a dither reference value from a dither matrix. Then, the dither reference value is employed to perform an inversely dithering process to recover the dithered pixel data into original pixel data.

Abstract: A non-stalling pipeline tag controller includes cascaded source and holding registers coupled respectively to an external input unit and a data memory module. A tag memory module includes a tag memory unit for storing tags to memory data in the data memory module, and a first comparator unit that generates a first decision signal to indicate whether the source tag in the source register matches with one of the tags in the tag memory unit. A status module includes a second comparator unit that generates a second decision signal to indicate whether the source tags stored in the source and holding registers match with one another, and a decision unit that compares the first and second decision signals and that generates a third decision signal to indicate occurrence of a cache hit or cache miss condition.