Image sequence coding method and decoding method

Details Image sequence coding method and decoding method Image sequence coding method and decoding method

H - Electricity

04

N

H04N 7/34 (2006.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01) H04N 7/36 (2006.01) H04N 7/46 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2240118

In order to prevent accumulation of rounding errors caused by the integer-based bilinear interpolation used in the motion compensation process of image coding and decoding methods, two types of P frames are used for unidirectional motion compensation prediction; P+ frames, which round the results of bilinear interpolation with real number operations to the nearest integer and rounds half integer values (0. 5 added to an integer) away from zero; and P- framed, which differs from P+ frames in that the above mentioned half integer values are rounded towards zero. Utilizing both of these P+ and P- frames enables canceling of rounding errors and prevents the accumulation of rounding errors.

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