Method and apparatus for conversion of frequency-coefficient mat

Details Method and apparatus for conversion of frequency-coefficient mat Method and apparatus for conversion of frequency-coefficient mat

1997-07-02

1999-08-03

Rogers, Scott

Image analysis

Image compression or coding

Transform coding

358433, G06T 900, H04N 1415

Patent

active

059335378

ABSTRACT:
A method and apparatus are disclosed for converting frequency-coefficient matrices between a configuration in which the matrices are transforms of unoverlapped image-data matrices and a configuration in which the matrices are transforms of overlapped image-data matrices, the image-data matrices comprising image-data terms corresponding to pixels from an original image, the method comprising the steps of: deriving a conversion matrix; transposing the conversion matrix; matrix multiplying a first frequency-coefficient matrix of one configuration by the conversion matrix; matrix multiplying a second frequency-coefficient matrix of the same configuration by the transpose conversion matrix; and combining the product results to form a matrix formatted in the other configuration.

REFERENCES:
patent: 5168375 (1992-12-01), Reisch et al.
patent: 5563718 (1996-10-01), Wober et al.

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