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US 11,308,318 B2Granted
Image processing apparatus, image processing method, and storage medium
AssigneeCanon Kabushiki Kaisha
InventorsKoya Shimamura, Junya Arakawa
Life of this patent
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Abstract
An image processing apparatus generates a first image by adjusting luminance so as to preserve a signal value on a high-luminance side among signal values acquired by reading a document by a scanner, and detects a position of a region corresponding to the document in the generated first image. The image processing apparatus further generates a second image by performing adjustment so as to increase luminance of a pixel contained in the first image, and crops a document image from the generated second image based on the detected position of the region corresponding to the document.
Claims16
An apparatus comprising:
- at least one processor;
- and a memory coupled to the at least one processor, the memory having instructions that, when executed by the processor, performs operations as:
- a first adjustment unit configured to generate a first image by performing a gain adjustment on signal values acquired by a scanner so that information of the signal values on a high-luminance side is preserved, wherein the first adjustment unit generates the first image by performing the gain adjustment so as to adjust a predetermined luminance value on the high-luminance side at the time of reading the document with the scanner to a first luminance value and thereafter performing processing to replace a luminance value of a pixel having the first luminance value if the luminance value of the pixel on which the gain adjustment has been performed is higher than the first luminance value;
- wherein the scanner acquires the signal values by reading a document;
- a detection unit configured to detect a position of a region corresponding to the document in the generated first image;
- a second adjustment unit configured to generate a second image from the first image by making an adjustment so as to increase luminance of at least one pixel contained in the first image;
- and
- a cropping unit configured to crop, based on the detected position of the region corresponding to the document, a document image corresponding to the document from the generated second image.
5 more elements
An apparatus comprising:
- at least one processor;
- and a memory coupled to the at least one processor, the memory having instructions that, when executed by the processor, performs operations as:
- a first adjustment unit configured to generate a first image by performing a gain adjustment on signal values acquired by a scanner so that information of the signal values on a high-luminance side is preserved, wherein the generating the first image generates the first image by performing gain adjustment so as to adjust a predetermined luminance value on the high-luminance side at the time of reading the document with the scanner to a first luminance value and thereafter performing processing to replace a luminance value of a pixel having the first luminance value if the luminance value of the pixel on which the gain adjustment has been performed is higher than the first luminance value;
- wherein the scanner acquires the signal values by reading a document;
- a detection unit configured to detect a position of a region corresponding to the document in the generated first image;
- a cropping unit configured to crop a first document image corresponding to the document from the generated first image, based on the position of the region corresponding to the detected document;
- and a second adjustment unit configured to generate a second document image by performing adjustment of the cropped first document image so as to increase luminance of at least one pixel contained in the cropped first document image.
4 more elements
A non-transitory computer readable storage medium storing a program for causing a processor to perform:
- generating a first image by performing a gain adjustment on signal values acquired by a scanner so that information of the signal values on a high-luminance side is preserved, wherein the generating the first image generates the first image by performing gain adjustment so as to adjust a predetermined luminance value on the high-luminance side at the time of reading the document with the scanner to a first luminance value and thereafter performing processing to replace a luminance value of a pixel having the first luminance value if the luminance value of the pixel on which the gain adjustment has been performed is higher than the first luminance value;
- wherein the scanner acquires the signal values by reading a document;
- detecting a position of a region corresponding to the document in the generated first image;
- generating a second image from the first image by performing adjustment so as to increase luminance of at least one pixel contained in the first image;
- and cropping, based on the detected position of the region corresponding to the document, a document image corresponding to the document from the generated second image.
2 more elements
A non-transitory computer readable storage medium storing a program for causing a processor to perform:
- generating a first image by performing a gain adjustment on signal values acquired by a scanner so that information of the signal values on a high-luminance side is preserved, wherein the generating the first image generates the first image by performing gain adjustment so as to adjust a predetermined luminance value on the high-luminance side at the time of reading the document with the scanner to a first luminance value and thereafter performing processing to replace a luminance value of a pixel having the first luminance value if the luminance value of the pixel on which the gain adjustment has been performed is higher than the first luminance value;
- wherein the scanner acquires the signal values by reading a document;
- detecting a position of a region corresponding to the document in the generated first image;
- cropping a first document image corresponding to the document from the generated first image based on the detected position of the region corresponding to the document;
- and generating a second document image by performing
- adjustment of the cropped first document image so as to increase luminance of at least one pixel contained in the cropped first document image.
3 more elements
A method that is executed by a processing unit of an apparatus, the method comprising:
- generating a first image by performing a gain adjustment on signal values acquired by a scanner so that information of the signal values on a high-luminance side is preserved,
- wherein the generating the first image generates the first image by performing gain adjustment so as to adjust a predetermined luminance value on the high-luminance side at the time of reading the document with the scanner to a first luminance value and thereafter performing processing to replace a luminance value of a pixel having the first luminance value if the luminance value of the pixel on which the gain adjustment has been performed is higher than the first luminance value;
- wherein the scanner acquires the signal values by reading a document;
- detecting a position of a region corresponding to the document in the generated first image;
- generating a second image from the first image by performing adjustment so as to increase luminance of at least one pixel contained in the first image;
- and cropping, based on the detected position of the region corresponding to the document, a document image corresponding to the document from the generated second image.
3 more elements
A method that is executed by a processing unit of an image processing apparatus, the method comprising:
- generating a first image by performing a gain adjustment on signal values acquired by a scanner so that information of the signal values on a high-luminance side is preserved,
- wherein the generating the first image generates the first image by performing gain adjustment so as to adjust a predetermined luminance value on the high-luminance side at the time of reading the document with the scanner to a first luminance value and thereafter performing processing to replace a luminance value of a pixel having the first luminance value if the luminance value of the pixel on which the gain adjustment has been performed is higher than the first luminance value;
- wherein the scanner acquires the signal values by reading a document;
- detecting a position of a region corresponding to the document in the generated first image;
- cropping, based on the detected position of the region corresponding to the document, a first document image corresponding to the document from the generated first image;
- and generating a second document image by performing adjustment of the cropped first document image so as to increase luminance of at least one pixel contained in the cropped first document image.
3 more elements
Dependencies are inferred from the claim text.