Artifact reduction with diffusion preprocessing for image compression

Ivan Kopilovic; Tamas Sziranyi

doi:10.1117/1.1849242

1 February 2005 Artifact reduction with diffusion preprocessing for image compression

Ivan Kopilovic, Tamas Sziranyi

Author Affiliations +

Optical Engineering, Vol. 44, Issue 2, 027003 (February 2005). https://doi.org/10.1117/1.1849242

Abstract

We evaluate a preprocessing method for image compression artifact reduction based on nonlinear diffusion filtering that we proposed earlier. The method consists of using edge-adaptive diffusion processes before the discrete cosine transform (DCT)-JPEG compression. By using a simple measure for artifact reduction, we show that considerable artifact reduction is achieved with preprocessing at the same bit rate as, and with no greater error than, the original compression. We also show that preprocessing helps to preserve the true contours for image processing applications. An automatic parameter selection for the preprocessing is also proposed, considering the edge histogram of the image and depending on the compression ratio. We test the method for visual quality with extensive subjective measurements. We show that, depending on the image content, preprocessing can significantly improve the visual quality at low bit rates.

©(2005) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Ivan Kopilovic and Tamas Sziranyi "Artifact reduction with diffusion preprocessing for image compression," Optical Engineering 44(2), 027003 (1 February 2005). https://doi.org/10.1117/1.1849242

Published: 1 February 2005

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