Image reading apparatus
AssigneeMinolta Co., Ltd.
InventorsShinya Matsuda, Shinya Uchikawa
Life of this patent
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Abstract
In an image reading apparatus for reading from above the image of a document, which has some thickness like a book or a file and is laid on a document table with its reading surface facing upward, a histogram regarding the brightness distribution of the reading surface is generated based on the image data of the reading surface, and the mode brightness and the maximum brightness of the reading surface are calculated, and it is determined whether show-through exists on the reading surface depending on the difference between the mode brightness and maximum brightness for preventing false detection of the base brightness caused by show-through effect.
Claims17
An image reading apparatus comprising:
- a document table on which a document can be placed with a reading surface that contains an image to be read facing upwardly;
- an image reading unit that reads images on the reading surface from above to capture image data;
- and
- a processor that generates a histogram regarding brightness distribution of the reading surface from the image data, calculates a mode brightness and a maximum brightness of the reading surface from the histogram, and determines whether show-through exists on the reading surface depending on difference between the mode brightness and the maximum brightness.
An image reading apparatus comprising:
- an image reading unit that captures image data by reading an image on a reading surface of a document;
- and
- a processor that generates a histogram regarding brightness distribution of the reading surface from the image data, calculates a mode brightness and a maximum brightness of the reading surface from the histogram, and determines whether show-through exists on the reading surface depending on difference between the mode brightness and the maximum brightness.
An image reading method comprising the steps of:
- (a) capturing image data by reading an image on a reading surface of a document;
- (b) generating a histogram regarding brightness distribution of the reading surface based on the image data;
- (c) calculating a mode brightness and a maximum brightness of the reading surface based on the histogram;
- and
- (d) determining whether show-through exists on the reading surface depending on difference between the mode brightness and maximum brightness.
Dependencies are inferred from the claim text.