Quality Preserving in Image Noise Removal by Using Texture Information

The existence of noise in image reduces its quality and hinders analysis of the image. Image noise reduction techniques are often accompanied with artifact, especially in facing with strong noise. Since sensitivity of human visual system is not alike in all areas of image, i.e. smooth and nonsmooth areas, noise removal can be performed considering the textual information of the image. The proposed approach intend to earnestly remove noise from the smooth region as it is more obvious to human visual system. Indeed, the filtered image produces less artifact in nonsoomth region, as the noise is superficially removed from the nonsmooth region. In the proposed method, the image is segmented into smooth and non-smooth regions using entropy information of the image. Then to remove the noise from each region, the diffusion filter with different parameters is used. The proposed method not only removes the noise but also preserves the edges and details of the image. The proposed method was evaluated using several noisy images and images from CSIQ and IVC databases. According to subjective and objective quality results, accuracy of the proposed method in Gaussian noise reduction is better than the previous works.