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:
“I also heard the whooping of the ice in the pond, my great bed-fellow in that part of Concord, as if it were restless in its bed and would fain turn over, were troubled with flatulency and bad dreams; or I was waked by the cracking of the ground by the frost, as if some one had driven a team against my door, and in the morning would find a crack in the earth a quarter of a mile long and a third of an inch wide.”
—Henry David Thoreau (1817–1862)
“till disproportion’d sin
Jarr’d against natures chime, and with harsh din
Broke the fair musick that all creatures made
To their great Lord, whose love their motion sway’d
In perfect Diapason, whilst they stood
In first obedience, and their state of good.”
—John Milton (1608–1674)
“I have everything in the world that is necessary to happiness, good faith, good friends and all the work I can possibly do. I think God’s greatest blessing to the human race was when He sent man forth into the world to earn his bread by the sweat of his face. I believe in toil, in the dignity of labor, but I also believe in adequate compensation for that toil.”
—Anna Howard Shaw (1847–1919)