METHOD AND APPARATUS FOR PROCESSING A GRAY IMAGE

摘要

A method and apparatus for processing a gray image, including: calculating a mean value and a standard difference of each edge pixel needing processing in an original gray image, and determining a predefined noise variance of each edge pixel according to the mean value and the standard difference; performing two-dimensional discrete cosine transform on an original gray image of a first adjacent area of each edge pixel; performing Wiener filtering on the two-dimensional discrete cosine transformed image data according to the noise variance; performing discrete cosine inverse transform on the two-dimensional Wiener filtered image data to obtain a filtered gray image of the first adjacent area; and extracting a filtered pixel value of each edge pixel from the filtered gray image of the first adjacent area, and obtaining a processed pixel value of each edge pixel by performing weighted summation on the filtered pixel value and an original pixel value.

主权项

1. A method for processing a gray image, comprising:
calculating a mean value and a standard difference of each of edge pixels needing to be processed in an original gray image, and determining a predefined noise variance of each of the edge pixels according to the mean value and the standard difference; performing two-dimensional discrete cosine transform on an original gray image of a first adjacent area of each of the edge pixels; performing two-dimensional Wiener filtering on the two-dimensional discrete cosine transformed image data according to the noise variance; performing two-dimensional discrete cosine inverse transform on the two-dimensional Wiener filtered image data, so as to obtain a filtered gray image of the first adjacent area; and extracting a filtered pixel value of each of the edge pixels from the filtered gray image of the first adjacent area, and performing weighted summation on the filtered pixel value of each of the edge pixels and an original pixel value of the edge pixel so as to obtain a processed pixel value of each of the edge pixels.