Picture decoding apparatus modifying received temporal references
AssigneeOki Electric Industry Co., Ltd.
InventorsShigeru Fukunaga, Toshihisa Nakai
Life of this patent
Estimating the term…
Abstract
A picture decoding apparatus decodes a series of coded frames, each including a temporal reference. Past temporal references are used to estimate the temporal reference of the-current frame. If the temporal reference differs greatly from the estimated value, it is modified according to the estimated value. A coded frame may be divided into segments, each segment having its own temporal reference. In this case, the temporal references received in one coded frame are stored and compared, and a single temporal reference is selected for the coded frame. As a result, temporal-reference errors do not seriously disrupt the timing of the decoded picture.
Claims44
A picture decoding apparatus decoding a series of coded frames, each coded frame including a temporal reference, comprising:
- a temporal-reference memory unit storing a plurality of past temporal references received in said coded frames;
- a temporal-reference estimation unit coupled to said temporal-reference memory unit, calculating an estimated temporal reference from said past temporal references;
- and
- a temporal-reference modification unit coupled to said temporal-reference memory unit, comparing said estimated temporal reference with a current temporal reference received in one of said coded frames, and modifying said current temporal reference in said one of said coded frames according to a difference between said current temporal reference and said estimated temporal reference.
A method of decoding a series of coded frames of a moving picture, each coded frame including a temporal reference, comprising the steps of:
- (a) storing a plurality of past temporal references received in said coded frames;
- (b) calculating an estimated temporal reference from said past temporal references;
- (c) comparing said estimated temporal reference with a current temporal reference received in one of said coded frames;
- and
- (d) modifying said current temporal reference in said one of said coded frames according to a difference between said current temporal reference and said estimated temporal reference.
A picture decoding apparatus decoding a series of coded frames, each coded frame including a plurality of coded segments, each coded segment including a temporal reference, comprising:
- a temporal-reference memory unit storing a plurality of temporal references received in the coded segments included in one of said coded frames;
- and
- a temporal-reference finalizing unit comparing the temporal references stored in said temporal-reference memory unit and selecting a final temporal reference for modifying said plurality of temporal references in said one of said coded frames.
A method of decoding a series of coded frames of a moving picture, each coded frame including a plurality of coded segments, each coded segment including a temporal reference, comprising the steps of:
- (a) storing a plurality of temporal references received in the coded segments included in one of said coded frames;
- (b) comparing the stored temporal references;
- and (c) selecting a final temporal reference for modifying said plurality of temporal references in said one of said coded frames.
Dependencies are inferred from the claim text.