Using optical defocus to denoise

Qi Shan, Jiaya Jia, Sing Bing Kang, Zenglu Qin
2010 2010 IEEE Computer Society Conference on Computer Vision and Pattern Recognition  
Effective reduction of noise is generally difficult because of the possible tight coupling of noise with high-frequency image structure. The problem is worse under low-light conditions. In this paper, we propose slightly optically defocusing the image in order to loosen this noise-image structure coupling. This allows us to more effectively reduce noise and subsequently restore the small defocus. We analytically show how this is possible, and demonstrate our technique on a number of examples
more » ... mber of examples that include low-light images.
doi:10.1109/cvpr.2010.5540164 dblp:conf/cvpr/ShanJKQ10 fatcat:kqmx7bq7ibdkxn5edetkvzy6ta