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:
“In the haunted house no quarter is given: in that respect
It’s very much business as usual. The reductive principle
Is no longer there, or isn’t enforced as much as before.”
—John Ashbery (b. 1927)
“I dunno what my 23 infantile years in America signify. I left as soon as motion was autarchic—I mean my motion.”
—Ezra Pound (1885–1972)
“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)