FIELD: information technology.
SUBSTANCE: image processing device includes a first bitmap processing means configured to apply bitmap processing to image data using a first threshold matrix, a second bitmap processing means configured to apply bitmap processing to image data using a second threshold matrix, and a contour detecting means configured to detect a contour portion of an object included in the image data. The image processing device also includes an output means configured to select and output image data obtained through a logic OR operation between image data obtained by the first bitmap processing means, and image data obtained by the second bitmap processing means for a pixel detected by the contour detecting means as belonging to a contour portion, and select and output image data obtained by the first bitmap processing means for a pixel which does not belong to the contour portion.
EFFECT: reducing staircase effect in a contour portion caused by bitmap processing of halftone image data.
11 cl, 12 dwg
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