Reducing errors in performance sensitive transformations

Details Reducing errors in performance sensitive transformations Reducing errors in performance sensitive transformations

2004-10-07

2008-09-02

Do, Anh Hong (Department: 2624)

Image analysis

Image compression or coding

Transform coding

C382S276000, C382S280000, C382S281000

Reexamination Certificate

active

07421139

ABSTRACT:
The invention provides a method, data compression system, apparatus, and article of manufacture which reduce the error in transform equations in which constants are replaced by approximations. According to the invention transform constants are replaced with approximations which are a function of an integer and a floating point value. The transform equation is then performed with the integers in place of the constants. The floating point value may be applied either to the result of the equation or to the data to be processed by the transform equation before the equation is performed. Further the floating point value may be applied using a fixed precision version of the value or a fixed precision value into which the floating point value has been factored.

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Trevor W. Fox et al, “Low Coefficient Complexity Approximations of the One Dimensional Discrete Cosinc Transform”, 2002 IEEE.

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