| 摘要 |
An image forming apparatus is provided with a resolution conversion unit 101 that integrates n pixels that are contiguous in the sub-scanning direction, and that determines an average value of pixel values of the n pixels as a pixel value of integrated pixels, a quantization unit 103 that quantizes the pixel value of the integrated pixels to N levels, an image analysis unit 100 that performs first judgment processing for judging whether the difference between the pixel values of the n input pixels exceeds a threshold value set in advance, and second judgment processing for judging whether a direction in which the pixel values of the n input pixels becomes greater is a forward direction of the sub-scanning direction or an opposite direction, and a pixel selection unit 104 that determines n output pixels, based on the judgment results, from a quantization result of the integrated pixels.
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