An adaptive Gaussian filter with scale adjustable

Using classical Gaussian filter with fix scale-parameter for noise suppression, often the noise is smoothed out, while the signal is also distorted. Therefore an adaptive Gaussian filter with the scale adjustable was designed. By computing the average of all intensity values in current filter window, and the difference between the average and the intensity value of the current pixel, the smooth degree of current filter window was obtained. And then by regarding the smooth degree as the scale size of Gaussian function, the scale parameter of the filter was adjusted automatically. Experiment results proved that this filter can remove noises effectively with the original signals of images preserved as much as possible. It is simple and adapt to engineering applications.