| 摘要 |
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 round half integer values (0.5 added to an integer) away from zero; and P- frames, which differ 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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