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 was able to believe for years that going to Madame Swann’s was a vague chimera that I would never attain; after having passed a quarter of an hour there, it was the time at which I did not know her which became to me a chimera and vague, as a possible destroyed by another possible.”
—Marcel Proust (1871–1922)
“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)
“In compensation for considerable disgust, despondency, and boredom—such as living in solitude without friends, books, duties, or passions necessarily entails—we are given those quarter-hours of deepest communion with ourselves and nature. Those who completely barricade themselves from boredom, barricade themselves from themselves as well: they will never get to drink the most refreshingly potent draught from the their own innermost fountain.”
—Friedrich Nietzsche (1844–1900)