Fast preview processing for JPEG compressed images

Details Fast preview processing for JPEG compressed images Fast preview processing for JPEG compressed images

1995-09-29

1997-10-07

Gregory, Bernarr E.

Image analysis

Image compression or coding

Including details of decompression

382232, 3582612, H03M 730

Patent

active

H00016845

ABSTRACT:
A method of fast decompressing a document image compressed using transform coding for scaling and previewing purposes. A fast algorithm is derived by utilizing a fraction of all available transform coefficients representing the image. The method is particularly efficient using the discrete cosine transform which is used in the JPEG ADCT algorithm. In JPEG ADCT, a very fast and efficient implementation is derived for a resolution reduction factor of 16 to 1 (4 to 1 in each direction) without needing any floating point arithmetic operations.

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Chen et al; "Adaptive Coding of Monochrome and Color Images"; IEEE Trans. Comm.; vol. COM-25, No. 11, Nov. 1977; pp. 1285-1292.

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