Denoise method study on CMOS image sensor
Li Xuan · Computer Engineering and Applications Journal · 2011
Color imaging sensors used in digital cameras acquire three spatially subsampled color channels with a Color Filter Array(CFA)mosaic.The acquired image is then processed through an imaging pipeline of demosaicing,denoising and color correction.The algorithms used in each stage of the image pipeline are complex,several processes of nonlinearity and the effect on the noise are complicated.The influence of demosaicing algorithms on the effects of denoising is discussed.This paper investigates the effects of the order of demosaic and denoise process on images and image noise.Images and noises are monitored and analyzed in each stage of the pipeline,to understand how each stage/algorithm affects and manipulates the noise characteristics.Noise characteristics are evaluated by various metrics from MSE and s-CIELAB.Ultimately,this paper gives conclusions.