Method and apparatus for post-processing images

Details Method and apparatus for post-processing images Method and apparatus for post-processing images

1995-12-18

1998-12-15

Lee, Thomas D.

Facsimile and static presentation processing

Facsimile

Auxiliary signal

382250, 382251, 382252, H04N 1415

Patent

active

058502947

ABSTRACT:
The invention is an image transmitting method and system including receiving encoded images, decoding those images and post-processing the decoded images. The post-processing reduces visual artifacts, such as blocking artifacts and mosquito noise, through separate detection, mapping and smoothing operations while avoiding many of the complexities associated with existing techniques. In detecting blocking artifacts, the inventive method employs DCT-domain detection rather than edge detection in the pixel domain. Also, the interior of a detected block is updated based on the surrounding blocks without disturbing the surrounding blocks. In reducing mosquito noise, the inventive method smooths the non-edge pixels within blocks containing edge pixels rather than smoothing the edge pixels. Also, distortion-induced false edge pixels are distinguished from true edge pixels and heavily smoothed. The post-processing method and system is generally applicable to Block DCT based compression systems, either intrinsically or extrinsically.

REFERENCES:
patent: 5379122 (1995-01-01), Eschbach
patent: 5608652 (1997-03-01), Astle
H. Reeve and J. Lim, "Reduction of blocking effects in image coding," Optical Engineering, vol. 23, pp. 34-37, Jan./Feb. 1984.
B. Ramamurthi and A. Gersho, "Nonlinear space-variant postprocessing of block coded images," IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP-34, pp. 1258-1268, Oct., 1986.

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