Method and system for converting data

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 converted to integers and clipped to an allowed range forming converted data. High-precision differences are obtained by subtracting the high-precision output of the inverse transform from the converted data. The converted data can be manipulated and sent to output devices which expect integer data. Processed high-precision numbers are formed by adding the high-precision differences to the processed converted data. Thus, the rounding and clipping errors are greatly reduced in the processed high-precision numbers. In another embodiment of the present invention processed high-precision numbers are generated by selecting the high-precision numbers instead of the manipulated converted data whenever the manipulated converted data still equals the converted 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.

Description

technical field [0001] This invention is related to the following applications: U.S. Application Serial No. 09 / 186,247, entitled "Error-Reducing Processing of Transformed Digital Data," inventor M. Bright et al; and U.S. Application Serial No. 09 / 186,245, entitled "Real Field Transform Domain Correction of Errors", inventor J. Mitchell et al; these applications are hereby incorporated by reference. Background technique [0002] This invention relates to transform coding of digital data, and more particularly to real domain processing of transformed data. More particularly, the present invention relates to error-reducing digital processing of inversely transformed data subjected to retransformation. [0003] Transform coding refers to a broad class of data coding in which individual blocks of data to be coded are transformed by means of certain mathematical functions before being further processed. A data block can be a part of the data object to be encoded, or it can be th...

AI Technical Summary

Problems solved by technology

[0013] These rounding and pruning processes are often considered to be the integer part of the decoder, and it is these that make the decoded data inaccurate, especially when the decoded data is re-encoded

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