06282243 is referenced by 145 patents and cites 3 patents.

A method and apparatus for interframe predictive video coding and decoding which avoid the accumulation of rounding errors and thus obtain high-quality reproduced pictures. A frame memory outputs at least one reference picture to a prediction picture calculation unit, according to motion vector information with half-pel accuracy. From the reference picture(s), the prediction picture calculation unit produces a prediction picture by performing interpolation operations if the motion vector has a half-pel component. Here, each interpolated pel value is rounded off to an integer according to a particular rounding algorithm specified by a calculation controller. More specifically, the prediction picture calculation unit supports a first algorithm that rounds off the pel values toward positive infinity and a second algorithm that rounds off them toward negative infinity. The calculation controller outputs a rounding control signal that directs the prediction picture calculation unit to select either of those two algorithms with substantially equal probabilities of occurrence.

Title
Apparatus and method for interframe predictive video coding and decoding with capabilities to avoid rounding error accumulation
Application Number
8/972362
Publication Number
6282243 (B1)
Application Date
November 18, 1997
Publication Date
August 28, 2001
Inventor
Eishi Morimatsu
Kawasaki
US
Akira Nakagawa
Kawasaki
US
Kimihiko Kazui
Kawasaki
US
Agent
Staas & Halsey
US
Assignee
Fujitsu
US
IPC
H04N 7/36
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