Importance

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Abstract

To perform processing to increase the number of pixels of inputted image data, the inputted image data having low resolution is converted to image data having high resolution. For this conversion, one pixel of the low resolution data is interpolated, a difference value between a predetermined value and image data included in an interpolating-pixel block which corresponds to a pixel of interest of the low resolution data, is calculated, and pixel values of pixels in the interpolation-pixel block are determined in accordance with the difference value. Furthermore, multi-level image data on which pixel values have been determined is binarized by the dither method, to determine pixel values such that the smaller the absolute value of the difference value is, the larger the difference from the predetermined value.

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First Claim