| 摘要 |
The invention is directed, in preferred embodiments, to method and apparatus for storing overlay pixels of a scaled overlay image over background pixels of a background image. The overlay and background pixels being defined by at least a luminance component and a color component. A preferred method comprises: (a) defining a first luminance value corresponding to a transparent overlay pixel; (b) defining a second luminance value corresponding to an opaque overlay pixel; and (c) where, for any first overlay pixels for which luminance components differ from the first and second luminance values, storing the luminance components so as to over-write the luminance components of the corresponding background pixels, and discarding the associated color components so as to leave remaining the color components of the corresponding background pixels. Preferably, the overlay and background pixels are defined in a sampling format providing for color information to be shared between at least two pixels. Preferred embodiments do not require background image pixels previously stored in a memory to be read from the memory. In preferred embodiments, portions of edge artifacts are disguised and remaining portions are eliminated.
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