Adaptive median-weighted mean hybrid filter

To remove mixed impulse noise and Gaussian noise in digital images, a hybrid filter based on the adaptive median filter and the adaptive weighted mean filter are proposed. The algorithm first divides the image into several parts and separates the two kinds of noise in each part by means of noise detection, then applies the adaptive median filter and the adaptive weighted mean filter to removing impulse noise and Gaussian noise, respectively. Results of computer simulation experiments on this new filter show that it has better filtering performance than the three hybrid filters mentioned, and it can suppress impulse noise and Gaussian noise effectively and preserve fine details very well, which provides an effective means for removing mixed noise in digital images.