| 主权项 |
1. A gray image processing method, comprising:
performing N-level decomposition of an original gray image by using a wavelet transform method; and processing each level of components one by one starting from an N-th level, to obtain a processed gray image; wherein the processing each level of components in N levels comprises: performing non-local means processing to all pixels of a first component, a second component, a third component and a fourth component of a current level, and performing wavelet reconstruction of the four non-local means processed components, to obtain a first component of a level preceding the current level; wherein the performing non-local means processing to one of all the pixels of a first component, a second component, a third component and a fourth component of the current level comprises: performing non-local means processing to one pixel of the first component of the current level, to obtain a pixel value of the non-local means processed pixel and a weighted value matrix of pixels within a predetermined search range around the pixel, wherein the weighted value matrix is an R×R matrix, R denoting the number of the pixels within the predetermined search range, which is an integer greater than or equal to 1; and using the weighted value matrix to respectively calculate pixel values of the non-local means processed pixels in the second component, the third component and the fourth component of the current level corresponding to the pixel in the first component; or the processing each level of components in the N levels comprises: performing non-local means processing to all the pixels of the first component of the current level, and performing wavelet reconstruction of the non-local means processed first component, second component, third component and fourth component, to obtain a first component of a level preceding the current level; wherein N is greater than or equal to 1, and when the current level is the N-th level, the first component of the current level is a first component obtained after the N-th level decomposition; and when N is greater than 1 and the current level is not the N-th level, the first component of the current level is a first component obtained after processing a component of a level next to the current level; and when N is greater than 1, manners for processing the components of different levels in the N levels are identical or different. |
