Picture coding method
AssigneesMitsubishi Electric System LSI Design Corporation, Mitsubishi Denki Kabushiki Kaisha
InventorsHidenori Omote, Hiroshi Segawa
Life of this patent
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Abstract
When fade-in is detected at a time (τf), the remaining number of bits (R) is increased by Rup=G/2. Thus, the remaining number of bits R to be consumed in the GOP (n) becomes (3/2)G=(12/8)G. In this way, the remaining number of bits (R) is increased when fade-in is detected. This increases the bit rate in pictures coming after fade-in and requiring a large information content, thereby improving picture quality.
Claims5
A picture coding method for coding a group of pictures consisting of pictures of a first type and of a second type which follows said picture of the first type, said picture coding method comprising the steps of:
- (a) consuming a remaining number of bits by coding each of said pictures;
- (b) increasing said remaining number of bits by a first number, as a first increase, when said group of pictures is updated;
- and
- (c) increasing said remaining number of bits by a second number, as a second increase, when fade-in is detected in said picture of said first type or said picture of said second type,
- wherein said remaining number of bits is increased at least as a part of said second increase when said fade-in is detected, and
- wherein said step (c) includes the step of:
- (c-1) increasing said remaining number of bits only by a third number proportional to a remaining number of said pictures ranging from a first detection picture when fade-in is detected to the last picture in said group of pictures which includes said first detection picture, as a part of said second increase, when said fade-in is detected.
A picture coding method for coding a group of pictures consisting of pictures of a first type and of a second type which follows said picture of the first type, said picture coding method comprising the steps of:
- (a) consuming a remaining number of bits by coding each of said pictures;
- (b) increasing said remaining number of bits by a first number, as a first increase, when said group of pictures is updated;
- (c) increasing said remaining number of bits by a second number, as a second increase, when fade-in is detected in said picture of said first type or said picture of said second type;
- and
- (d) subtracting said second number in total from said remaining number of bits at least at a time,
- wherein said step (d) includes the steps of:
- (d-1) reducing said remaining number of bits when fade-out is detected, and
- (d-2) reducing said remaining number of bits at least in the latest one of said pictures of the first type, after said second increase is completed,
- wherein, if said fade-out is detected in the middle of said step (d-2), said step (d-1) is performed to complete said step (d).
Dependencies are inferred from the claim text.