Image deformation processing device and image deformation processing method

An image deformation processing device for carrying out a deformation process for an input image having a dot matrix form in which pixels are arranged in a first direction and a second direction which is perpendicular to the first direction, so as to deform the input image in the first direction to generate an output image having the dot matrix form, wherein a coordinate system in which a distance between two adjacent pixels is 1, is defined for each of the input image and the output image, the image deformation processing device comprising:

• a shift amount calculating unit configured to calculate a coordinate of the input image which is mapped to a position of a specified pixel by the deformation process, and to calculate a difference between the calculated coordinate and a coordinate of the specified pixel as a shift amount, for each specified pixel in the output image;
• a dispersion threshold table in which a threshold is stored for each coordinate in the second direction;
• and
• an output unit configured to obtain the threshold corresponding to the coordinate of the specified pixel in the second direction from the dispersion threshold table, to calculate a pixel shift amount by comparing the obtained threshold with a decimal component of the shift amount for the specified pixel and by rounding up or down the decimal component of the shift amount for the specified pixel, and to output the pixel in the input image, which has a coordinate shifted from the coordinate of the specified pixel by the pixel shift amount, as the specified pixel.