Importance

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Abstract

In an image processor, a reduced image forming unit forms a reduced image by reducing an original image. The reduced image peripheral average value generating unit generates a peripheral average value for each pixel of the reduced image. The reduced image reflectance component calculating unit calculates a reflectance component indicating a ratio of brightness between each pixel and the peripheral pixels thereof for the each pixel in the reduced image. The frequency distribution generating unit generates a frequency distribution of the frequency of each value of reflectance component calculated by the reduced image reflectance component calculating unit. The representative reflectance component determining unit determines a representative reflectance component based on the frequency distribution. The simplified correcting unit performs a simplified correcting operation for correcting the value of the target pixel in the original image by converting the value of the target pixel to an output value based on the representative reflectance component and the value of the target pixel in the original image.

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First Claim