Image restoration using vector classified adaptive filtering

Paul Richardson

doi:10.1117/12.157918

22 October 1993 Image restoration using vector classified adaptive filtering

Paul Richardson

Proceedings Volume 2094, Visual Communications and Image Processing '93; (1993) https://doi.org/10.1117/12.157918
Event: Visual Communications and Image Processing '93, 1993, Cambridge, MA, United States

Abstract

This paper describes a novel adaptive filtering technique for image reconstruction `Vector Classified Adaptive Filtering' (VCAF) and provides comparative results when reconstructing images corrupted by additive Gaussian noise. Each sample in the image being reconstructed is first classified by mapping a classification vector onto a codebook as is done in Vector Quantization (VQ) image coding. The classification vector is a set of samples from the neighborhood of the one being reconstructed, and the codebook is a set of vectors designed off line using representative images, a model of the distortion function, and VQ codebook design techniques. Once the classification of the local region has been determined an optimal reconstruction filter is used to estimate the correct sample value. In this paper Wiener filtering techniques and a priori information from representative images are used to design least square optimal reconstruction filters for each class in the codebook. Thus VCAF is a very highly adaptive filter that incorporates a priori knowledge of typical image statistics in the form of a classification codebook and optimal reconstruction filter for each class. Experimental results indicate that VCAF performs very well with respect to the techniques with which it was compared; specifically non-adaptive Wiener filtering and edge orientation adaptive Wiener filtering.

Citation Download Citation

Paul Richardson "Image restoration using vector classified adaptive filtering", Proc. SPIE 2094, Visual Communications and Image Processing '93, (22 October 1993); https://doi.org/10.1117/12.157918

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