IMAGE PROCESSING DEVICE FOR REDUCING IMAGE NOISE AND THE METHOD THEREOF

摘要

An image processing device for reducing image noise and the method thereof are provided. The method for reducing image noise includes the following steps. A filtering operation is performed on a plurality of pixel values of a first image according to a high-pass (HP) filtering mask, a first default filtering mask and a second default filtering mask to obtain a high-pass filtering image, a first low-pass (LP) image and a second LP image, respectively. A difference between the first and the second LP images is calculated to obtain a LP difference image. A pixel weighting calculation is performed according to the HP image and the LP difference image to obtain a pixel weighting mask corresponding to the first image. The first image is calculated according to the pixel weighting mask and one of the first and the second LP images to obtain a noise reducing image.

主权项

1. A method for reducing image noise, comprising:
performing a high-pass filtering operation on a plurality of pixels of a first image according to a default high-pass filtering mask to obtain a high-pass image; performing a low-pass filtering operation on the pixels of the first image according to a first default filtering mask and a second default filtering mask to respectively obtain a first low-pass image and a second low-pass image, wherein the first default filtering mask is different to the second default filtering mask; performing a difference calculation on the first low-pass image and the second low-pass image to obtain a low-pass difference image; performing a pixel weighting calculation on the pixels according to the high-pass image and the low-pass difference image to obtain a pixel weighting mask corresponding to the first image; and calculating the first image according to the pixel weighting mask and one of the first low-pass image and the second low-pass image to obtain a noise reducing image.