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:
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—Sir Arthur Conan Doyle (1859–1930)
“The motion picture is like a picture of a lady in a half- piece bathing suit. If she wore a few more clothes, you might be intrigued. If she wore no clothes at all, you might be shocked. But the way it is, you are occupied with noticing that her knees are too bony and that her toenails are too large. The modern film tries too hard to be real. Its techniques of illusion are so perfect that it requires no contribution from the audience but a mouthful of popcorn.”
—Raymond Chandler (1888–1959)
“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)