| 摘要 |
PCT No. PCT/EP87/00292 Sec. 371 Date Jan. 28, 1988 Sec. 102(e) Date Jan. 28, 1988 PCT Filed Jun. 2, 1987 PCT Pub. No. WO87/07740 PCT Pub. Date Dec. 17, 1987.A method of processing an image for noise reduction, comprising the steps of: (a) generating from the image an array of pixel image values representative of the light values of its pixels; (b) grouping the pixel image values into groups corresponding to groups of pixels aligned along a predetermined direction; (c) processing a group of pixel image values using a transform algorithm and a thresholding operation to separate image components from noise components; (d) repeating step (c) with each group of pixel image values corresponding to groups of pixels aligned along the predetermined direction, the position of which group is translated by a fixed number of pixels with respect to the preceding group; (e) accumulating and averaging the image value components from every group contributing to each image element so as to provide an array of processed pixel image values having a partially reduced noise component; (f) repeating steps (b) to (e) with groups of pixel images values having noise components partially reduced by the former processing steps, these groups of pixel image values corresponding to groups of pixels aligned along a succession of other directions, whereby the noise component of the image is effectively reduced.
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