IMAGE PROCESSING DEVICE AND IMAGE PROCESSING METHOD Russian patent published in 2013 - IPC H04N1/409 

Abstract RU 2491753 C1

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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RU 2 491 753 C1

Authors

Kasibuti Joiti

Dates

2013-08-27Published

2011-12-09Filed