Image processing device setting binary value without using dither matrix when prescribed condition is satisfied
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United States of America Patent
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Feb 2, 2016
Grant Date -
Apr 2, 2015
app pub date -
Sep 19, 2014
filing date -
Sep 30, 2013
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Abstract
An image processing device includes a controller. The controller specifies an edge pixel based on image data, and sets a target pixel and a reference pixel from among a plurality of pixels. The target pixel is located between the edge pixel and the reference pixel. The controller determines whether a determination condition is satisfied for the target pixel. The determination condition indicates that a pixel value of the edge pixel, a pixel value of the target pixel, and a pixel value of the reference pixel monotonically increase in said order. The controller sets a binary value of the target pixel to a first value without using a dither matrix when the determination condition is satisfied, and sets the binary value of the target pixel to one of the first value and a second value by using the dither matrix when the determination condition is not satisfied.
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