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OwnerHou-Chun Ting, Hsueh-Ming Hang +2inventors
InventorsHou-Chun Ting, Hsueh-Ming Hang, Jang-Zern Tsai, Chien-Chen Liang
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Tape formatting, tracking and trick mode data generation are disclosed for providing trick modes for compressed video stored on a video tape. The tape is formatted so that trick mode data is recorded at normal speed within certain areas delineated by predetermined boundaries that are within a maintainable range of a predetermined ideal scan path of the heads. These boundaries are oblique to the normal speed tracks and define trick mode data areas in which trick mode data may be recorded. To facilitate tracking, sync words and trick mode identification codes are interleaved within the trick mode data areas. During tracking, the heads reproduce the sync words and identification codes, and the identification codes that match the currently utilized trick mode are counted. The count during a current interval is compared to a count during a previous interval or a threshold to determine if the heads have locked onto the ideal scan path or deviated therefrom. Trick mode data is generated by replicating a limited portion of the compressed video data of selected pictures, which trick mode data can be independently reproduced, decoded and presented during trick mode playback.
A method for generating trick play data from a bitstream containing intra-pictures and predictive pictures comprising the steps of:
A method for decoding trick mode data comprising the steps of:
A storage medium storing information of compressed pictures including a trick play data stream that can be decompressed to produce moving pictures during n times a normal speed playback, where n≠1, said storage medium storing one sequence of variable length coded coefficients for each of a plurality of macroblocks of each of plural selected intra-pictures, each reproduced sequence being only a first type of sequence or a second type of sequence, said first type of sequence including only a DC coefficient of said macroblock, said second type of sequence including said DC coefficient, a run length of a sequence of zero amplitude AC coefficients immediately following said DC coefficient, in scan order, and a non-zero amplitude AC coefficient immediately following said sequence of zero amplitude AC coefficients, in scan order.
Dependencies are inferred from the claim text.