A VQ-Based Blind Image Restoration Algorithm Source: IEEE Transaction on Image Processing, pp. 1044~1053, 2003 Author: Ryo Nakagaki and Aggelos K. Katsaggelos Speaker: Gary Lin

Problem: image restoration Original Blurred Restored

Basic idea VQ codebooks are designed for the restoration problem Low frequency information of the degraded image High frequency information of the original image

Concept map Low pass High pass Codebook Design Low-pass filtered image Original image High-pass filter image estimation High-pass filtered image Codebook Design

Codebook construction Low-pass filtered image High-pass filtered image Original image . . Codebook Design

Codebook construction & image restoration Original image Blurred image

Codebook construction for Blind image

Blurred functions Gaussian Uniform Rayleigh Gamma

Blind image restoration

Gaussian blur function Experiments Original image BSNR=20dB BSNR=10dB Gaussian blur function Restoration Restoration

Experiments Restoration image Original image Blurred image