Restoration of out-of-focus images based on circle of confusion estimate

Paolo Vivirito; Sebastiano Battiato; Salvatore Curti; M. La Cascia; Roberto Pirrone

doi:10.1117/12.452176

21 November 2002 Restoration of out-of-focus images based on circle of confusion estimate

Paolo Vivirito, Sebastiano Battiato, Salvatore Curti, M. La Cascia, Roberto Pirrone

Proceedings Volume 4790, Applications of Digital Image Processing XXV; (2002) https://doi.org/10.1117/12.452176
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

In this paper a new method for a fast out-of-focus blur estimation and restoration is proposed. It is suitable for CFA (Color Filter Array) images acquired by typical CCD/CMOS sensor. The method is based on the analysis of a single image and consists of two steps: 1) out-of-focus blur estimation via Bayer pattern analysis; 2) image restoration. Blur estimation is based on a block-wise edge detection technique. This edge detection is carried out on the green pixels of the CFA sensor image also called Bayer pattern. Once the blur level has been estimated the image is restored through the application of a new inverse filtering technique. This algorithm gives sharp images reducing ringing and crisping artifact, involving wider region of frequency. Experimental results show the effectiveness of the method, both in subjective and numerical way, by comparison with other techniques found in literature.

Citation Download Citation

Paolo Vivirito, Sebastiano Battiato, Salvatore Curti, M. La Cascia, and Roberto Pirrone "Restoration of out-of-focus images based on circle of confusion estimate", Proc. SPIE 4790, Applications of Digital Image Processing XXV, (21 November 2002); https://doi.org/10.1117/12.452176

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