Sum of absolute transformed differences

（重定向自SATD）

The sum of absolute transformed differences (SATD) is a widely used block matching criteria used in fractional motion estimation for video compression. It works by taking a frequency transform, usually a Hadamard transform, of the differences between the pixels in the original block and the corresponding pixels in the block being used for comparison. The transform itself is often of a small block rather than the entire macroblock. For example, in x264, a series of 4×4 blocks are transformed rather than doing the more processor-intensive 16×16 transform.

单词	SATD
释义	SATD 英语百科 Sum of absolute transformed differences （重定向自SATD） The sum of absolute transformed differences (SATD) is a widely used block matching criteria used in fractional motion estimation for video compression. It works by taking a frequency transform, usually a Hadamard transform, of the differences between the pixels in the original block and the corresponding pixels in the block being used for comparison. The transform itself is often of a small block rather than the entire macroblock. For example, in x264, a series of 4×4 blocks are transformed rather than doing the more processor-intensive 16×16 transform.
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