Quarter Pixel (QPel) and Half Pixel Motion Compensation
In motion compensation, quarter or half samples are actually interpolated sub-samples caused by fractional motion vectors. Based on the vectors and full-samples, the sub-samples can be calculated by using bicubic or bilinear 2-D filtering. See subclause 8.4.2.2 "Fractional sample interpolation process" of the H.264 standard.
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Famous quotes containing the words quarter, motion and/or compensation:
“A quarter of an hour is worth a thousand pieces of gold.”
—Chinese proverb.
“Too many Broadway actors in motion pictures lost their grip on success—had a feeling that none of it had ever happened on that sun-drenched coast, that the coast itself did not exist, there was no California. It had dropped away like a hasty dream and nothing could ever have been like the things they thought they remembered.”
—Mae West (1892–1980)
“I do not want to be covetous, but I think I speak the minds of many a wife and mother when I say I would willingly work as hard as possible all day and all night, if I might be sure of a small profit, but have worked hard for twenty-five years and have never known what it was to receive a financial compensation and to have what was really my own.”
—Emma Watrous, U.S. inventor. As quoted in Feminine Ingenuity, ch. 8, by Anne L. MacDonald (1992)