Image reading apparatus with determination of original size, and image forming apparatus, reading method, and image forming system therewith
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United States of America Patent
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Sep 1, 2020
Grant Date -
Jun 21, 2018
app pub date -
Dec 12, 2017
filing date -
Dec 16, 2016
priority date (Note) -
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Abstract
An image reading apparatus compares a difference in luminance value between a pixel of interest in image information acquired via a reading unit and a pixel separated from the pixel of interest by a first distance with a first threshold value. Further, the image reading apparatus compares a difference in luminance value between the pixel of interest and a pixel present within a range to a pixel separated from the pixel of interest by a second distance that is larger than the first distance with a second threshold value. The image reading apparatus determines whether or not the pixel of interest is an edge pixel at an original end portion based on results of those comparisons, and determines an original size based on a result of the determination.
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