Detail-preserving noise filtering using binary index

Yuji Itoh

doi:10.1117/12.234735

13 March 1996 Detail-preserving noise filtering using binary index

Yuji Itoh

Proceedings Volume 2666, Image and Video Processing IV; (1996) https://doi.org/10.1117/12.234735
Event: Electronic Imaging: Science and Technology, 1996, San Jose, CA, United States

Abstract

While high compression ratio has been achieved using recently developed image coding algorithm, the image restoration is considered as an important subject. We have attempted to restore the images coded by discrete cosine transform (DCT) based coding such as JPEG and MPEG. Some of the conventional adaptive filters are designed to seek a homogeneous region among the predetermined polygonal subregions, then to apply a smoothing operation within the selected subregion. It shall be noted, however, that sometimes the predetermined subregions may be heterogeneous. This fact leads us to a novel idea; instead of examining the predetermined regions, define a lot more flexible region likely to be homogeneous. In order to achieve this, we introduce the binary index: each pixel is classified into either the lower intensity group or higher intensity group based on local statistics. Then a smoothing operation is applied within the pixels having the same group index as the pixel to be processed. Thus our scheme can seek a homogeneous region appropriately. Another advantage is that it can be realized with significantly low computations. It is shown that this approach can suppress the visible artifacts while retaining the fine details such as edge and texture.

Citation Download Citation

Yuji Itoh "Detail-preserving noise filtering using binary index", Proc. SPIE 2666, Image and Video Processing IV, (13 March 1996); https://doi.org/10.1117/12.234735

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