Improved bit-allocation algorithm for Anisotropic Gaussian filter

This paper proposes an improved bit-allocation algorithm for anisotropic Gaussian filter to smooth a noisy image without blurring the edges.A median filter is used to smooth salt and pepper noise,then the variance of gray-scale is used to adjust Gaussian space coefficient,so the image edge can be automatically detected.The results indicate that the image edge can be well preserved and the noise can be got rid of completely through this improved algorithm.