| 摘要 |
An original image is transformed into a multi-resolution space and is thereby decomposed into images, each of which is of one of a plurality of different frequency bands. An image of the lowest frequency band, which is lowest among the plurality of the different frequency bands, is processed with the formulagL'=gL+f1(gL)=f2(gL)wherein f1(gL) represents a function, the value of which decreases monotonically as the signal value gL of the image of the lowest frequency band increases. A processed image of the lowest frequency band is obtained from the processing. An inverse multi-resolution transform is then carried out on the processed image of the lowest frequency band and the images of the other frequency bands, and a processed image is thereby obtained.
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