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Abstract

An apparatus and a method for compensating the gray-scale values of an image scanned by a contact image sensor. The gray-scale compensating apparatus includes: a power supply for providing a fixed level of voltage source, a contact image sensor for scanning an image and outputting image voltages V.sub.IMG of pixels of the image, or scanning a white pixel and outputting the white-level voltage V.sub.P of the white pixel, an analog/digital converter, to receive the fixed voltage from the power supply and the image voltage V.sub.IMG or the white-level voltage V.sub.P, a microprocessor to calculate the average of n white-level values G(x, y), where n is an integer, and the average value G'(x)=(G(x, 0)+G(x, 1)+ . . . +G(x, n-1))/n. The microprocessor also determines the gray-scale values g'(x, y) of the image being compensated by calculating the gray-scale values g(x, y) of the image not compensated in accordance with the value of G'(x).

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