| 摘要 |
A digital image signal, which represents values of picture elements arrayed along X and Y directions of an image, is subjected to operation processing carried out with the formulaQ'=Qorg+ beta (Qorg-Qus),wherein Qorg represents the original image signal representing each picture element, Qus represents an unsharp mask signal corresponding to super-low frequency with respect to the picture element, and beta represents an emphasis coefficient. The image signal obtained from the operation processing is fed into a reproducing apparatus, which reproduces an image by operations for scanning along X and Y directions. The operation processing is carried out with respect to the X and Y directions, under characteristics varying for different directions, and in accordance with a difference between responses of the reproducing apparatus along the X and Y directions. Final levels of sharpness of a visible image, which is reproduced by the reproducing apparatus, along the X and Y directions are thereby adjusted to be approximately equal to each other.
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