Method of reducing block artifacts created by block transform co

Details Method of reducing block artifacts created by block transform co Method of reducing block artifacts created by block transform co

1991-08-05

1995-09-26

Boudreau, Leo H.

Image analysis

Image compression or coding

Including details of decompression

382268, G06K 900

Patent

active

054540518

ABSTRACT:
A method of improving image quality when using block transform image compression algorithms by applying a variable lowpass filter (blur) operation on block boundaries that is based on the coefficients of the transformed data. The method of reducing block artifacts results from adaptively blurring the block boundaries based on the frequency content of the blocks. Low frequency blocks are heavily blurred, while high frequency blocks should have very little blur.

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Nachrichten Technik Elektronik, vol. 38, No. 5, May, 1988, Berlin DD, pp. 166-169, L. Arnold et al. "Adaptive Transformationscodierung Von Grauwertbildern Mit Vermindetem Blocking-Effekt", Section 3.2 on pp. 168-169, FIG. 10.

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