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    Reduced-error processing of transformed digital data
    13.
    发明专利
    Reduced-error processing of transformed digital data 未知

    公开(公告)号：GB2344716B

    公开(公告)日：2003-07-30

    申请号：GB9924446

    申请日：1999-10-18

    Applicant: IBM

    Inventor： BRIGHT MARTIN JAMES ,  MITCHELL JOAN LAVERNE

    IPC: H04N1/41 ,  G06T9/00 ,  H03M7/30 ,  H04N7/26 ,  H04N7/30 ,  H04N7/32 ,  H04N7/50

    Abstract: This invention solves problems due to employing error degraded data in digital processing. It particularly solves multi-generation problems wherein transform data degrade during each inverse transform and forward transform cycle even without any processing due to the rounding and clipping errors. It provides methods, systems and devices for reduced-error processing of transform-coded data. After inverse transformation of transform data, high-precision numbers are manipulated. The converting to integers and clipping to an allowed range steps are executed at any stage in the manipulation to obtain integer representation of the inverse transformed data such as for displaying of the data. However, further processing including forward transforming back to the transform domain is executed on the high-precision numbers. Thus, the rounding and clipping errors are not present in the processed data. Although advantageous to many applications employing digital transformed data, the invention is particularly advantageous for use in digital studios during editing of MPEG-coded, JPEG-coded and wavelet-coded video and audio data.

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