Image processing apparatus configured for binarizing image data and methods for binarizing image data
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United States of America Patent
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Oct 16, 2018
Grant Date -
Sep 21, 2017
app pub date -
Mar 10, 2017
filing date -
Mar 18, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
An image processing apparatus has a storage configured to store image data representing a color image, the image data being constituted by multiple pixels, each of the multiple pixels having a gradation value, and a controller. The controller is configured to extract pixels, from among the multiple pixels, within a specific color range as target pixels, adjust the gradation values of the target pixels such that brightness values of the target pixels are lowered, generate a histogram of index values corresponding to quantities of the brightness values of the multiple pixels constituting the image data after the gradation values of the target pixels are adjusted, set a first threshold value based on the histogram as generated, and apply a binarizing process to the image data using the first threshold value.
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