Image reading apparatus and image reading method
AssigneeSharp Kabushiki Kaisha
InventorsKazuhiro Mizude, Kazuma Ogawa, Tatsuya Fujisaki, Sho Tsujimoto
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Abstract
An image reading apparatus includes a platen on which a document is to be placed; an image generating unit that performs scanning on the platen to generate a position detection image and an output image; a document position detecting unit that detects whether a document exists and a position of the document based on the generated position detection image; a document extracting unit that extract an area corresponding to the document from the generated output image; and a control unit that controls the image generating unit, the document position detecting unit, and the document extracting unit so as to output an image of the extracted document.
Claims6
An image reading apparatus comprising:
- a platen on which a document is to be placed;
- an image generator including a position detection image generator that performs scanning on the platen and the document, and generates a position detection image and an output image;
- a document position detector that detects whether a document exists and a position of the document based on the generated position detection image;
- wherein the position detection image generator adjusts gradation characteristics of the scanned document and an area outside the document in the position detection image to increase a density difference between the scanned document and the area outside the document;
- a document extractor that extracts an area corresponding to the document from the generated output image;
- and
- a controller that controls the image generator, the document position detector, and the document extractor so as to output an image of the extracted document.
An image reading method causing a computer to perform:
- generating a position detection image and an output image by performing scanning on a platen on which a document is placed;
- detecting whether a document exists and a position of the document based on the generated position detection image;
- adjusting gradation characteristics of the scanned document and an area outside the document in the position detection image to increase a density difference between the scanned document and the area outside the document;
- and
- extracting an area corresponding to the document from the generated output image;
- and
- outputting an image of the extracted document.
An image reading apparatus comprising;
- a platen on which a document is to be placed;
- an image generator including a position detection image generator that performs scanning on the platen and the document, and generates a position detection image;
- a document position detector that detects whether a document exists and a position of the document based on the generated position detection image;
- wherein the position detection image generator adjusts gradation characteristics of the scanned document and an area outside the document in the position detection image to increase a density difference between the scanned document and the area outside the document;
- an image convertor that extracts an area corresponding to the position of the document from the generated position detection image to convert the area corresponding to the position of the document into an image to be output, wherein conversion of the area corresponding to the position of the document removes the gradation characteristic adjustments;
- and
- a controller that controls the image generator, the document position detector, and the image convertor so as to output the converted image.
An image reading method causing a computer to perform:
- generating a position detection image by performing scanning on a platen on which a document is placed;
- detecting whether a document exists and a position of the document based on the generated position detection image;
- adjusting gradation characteristics of the scanned document and an area outside the document in the position detection image to increase a density difference between the scanned document and the area outside the document increases;
- extracting an area corresponding to the position of the document from the generated position detection image to convert the area corresponding to the position of the document into an image to be output;
- and
- outputting the converted image.
Dependencies are inferred from the claim text.