Patent ID: 8094342

Claim:
An image processing device configured to retain a high resolution dithering matrix, the image processing device comprising: a comparing unit constructed to compare a pixel value included in each pixel of a low resolution input image with a plurality of thresholds included in the high resolution dithering matrix; an obtaining unit constructed to obtain a multi-level gray scale signal value for each pixel by multiplying each of a plurality of comparison results obtained for each of the pixels by a coefficient and adding up the plurality of values obtained by the multiplication; and an output unit constructed to output the multi-level gray scale signal values obtained by the obtaining unit, wherein a threshold which is in a plurality of thresholds compared with the pixel value included in a first pixel of the low resolution input image and whose comparison result is multiplied with the maximum coefficient does not agree with a threshold which is in a plurality of thresholds compared with the pixel value included in a second pixel of the low resolution input image and whose comparison result is multiplied with the maximum coefficient; and wherein a threshold which is in the plurality of thresholds compared with the pixel value included in the first pixel of the low resolution input image and whose comparison result is multiplied with the minimum coefficient agrees with a threshold which is in the plurality of thresholds compared with the pixel value included in the second pixel of the low resolution input image and whose comparison result is multiplied with the minimum coefficient.