Estimating the Standard Deviation of Noise via Controlled Function
基于控制函数估计图像噪音的标准方差

This paper presented a new algorithm to estimate the standard deviation of noise for nature images.It uses a gradient filter to estimate the noise on some parts which are selected by a controlled function from the tessellating ima-ge.The controlled function can be related to the preestimate of SNR.We optimally determined the controlled function as an exponential function by minimizing the total error.The controlled function can effectively offset the effect which is caused by filtering the image structure.T...