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Abstract

A spatial-domain processing is carried out on an image signal, which is made up of a series of original picture element values of picture elements constituting an image, the values being expressed with integral numbers, and spatial-domain processed signal values, which correspond to the respective picture elements and are represented by real numbers, are thereby obtained. Each of the spatial-domain processed signal values is multiplied by a factor of n, where n is larger than 1 and represents a real number other than integral numbers. In this manner, n-fold signal values are obtained. Each of the n-fold signal values is approximately represented by an integral number. The thus obtained integral number is taken as a new picture element value of the corresponding picture element constituting the image. Gradation transform is thus carried out such that no artifact may occur at a gradation part in an image, which is reproduced from the image signal obtained from the gradation transform.

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First Claim