1/f Noise Reduction and Image Enhancement on CMOS Image Sensors by Autocorrelation Based on Adaptive Algorithm
Kunsu Hwang, T. H. Nishimura · 2008
In CMOS image sensor, 1/f noise is determined by width and length of gate at the circuit. Reducing the 1/f noise, a correlative multi sampling and an autocorrelation method have been used, mainly. Nevertheless, a correlative multi sampling has a practical problem of limitation which is the band of applied frequency. Because of the problem, an autocorrelation method is used for the reducing of 1/f noise better than correlative multi sampling. General noise reduction filters along with the smoothing effect. In this study, the autocorrelation method based on adaptive algorithm is proposed to reduce the smoothing effect at the edge of image.