Using Optical Defocus to Denoise

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 that include low-light images.

• Type: Conference
• Year: 2010
• Where: CVPR
• Authors: Qi Shan, Jiaya Jia, Sing Bing Kang, Zenglu Qin
• Keywords: Computer Vision, CVPR 2010, Low-light Conditions, Noise-image Structure Coupling, Possible Tight Coupling