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.
Read more about this topic: Motion Compensation
Famous quotes containing the words quarter, motion and/or compensation:
“American family life has never been particularly idyllic. In the nineteenth century, nearly a quarter of all children experienced the death of one of their parents.... Not until the sixties did the chief cause of separation of parents shift from death to divorce.”
—Richard Louv (20th century)
“Motion or change, and identity or rest, are the first and second secrets of nature: Motion and Rest. The whole code of her laws may be written on the thumbnail, or the signet of a ring.”
—Ralph Waldo Emerson (1803–1882)
“The compensation of a very early success is a conviction that life is a romantic matter. In the best sense one stays young.”
—F. Scott Fitzgerald (1896–1940)