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AssigneeFujitsu Limited
InventorsKimihiko Kazui, Akira Nakagawa, Eishi Morimatsu
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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.
A video coding apparatus for performing an interframe predictive coding, which has a prediction picture generator to produce a prediction picture from a reproduced video image and a motion vector, comprising:
A video decoding apparatus for decoding predictive-coded pictures, which has a prediction picture generator to produce a prediction picture from a reproduced video image and a motion vector, comprising:
A method of coding video images with an interframe prediction technique which produces a prediction picture by interpolation operations with a rounding process, based on at least one reference picture, the method comprising:
A method of decoding a video bitstream encoded with an interframe prediction technique, which produces a prediction picture by interpolation operations with a rounding process, based on at least one reference picture, the method comprising:
A video coding apparatus for performing an interframe predictive coding, which has a prediction picture generator to produce a prediction picture from a reproduced video image and a motion vector, comprising:
A video decoding apparatus for decoding predictive-coded pictures, which has a prediction picture generator to produce a prediction picture from a reproduced video image and a motion vector, comprising:
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