| 摘要 |
Digital video data streams that conform to standards such as the ITU-T H.263 and MPEG-4 ISO/IEC standards are compressed to reduce the amount of memory needed to store these streams. Information for a sequence of frames is compressed by rounding and truncating luminance values, and by encoding chrominance values using a radix tree and a palette. Each entry in the palette stores information representing a color that actually occurs at least once in the sequence of frames. The radix tree provides an efficient way to generate compressed representations for colors that are stored in the palette, and also provides a way to identify the color in the palette that is the closest match to other colors in the data stream that are not stored in the palette.
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