Document image scanning device that provides image of proper appearance while preserving image density
First Claim
Patent Images
1. A device for scanning a document, comprising:
- a photoelectric conversion unit which scans a document, and supplies image data of the scanned document;
a background detecting unit which detects a background level of the image data so as to produce original background level value data that is separate from and not part of the image data and indicative of the background level;
an image processing unit which applies one or more types of image processing to the image data, and applies image processing identical to said one or more types of image processing to the original background level value data to produce image processed modified background level value data; and
a background removal unit which generates a threshold derived from the image processed modified background level value data, and which utilizes said generated threshold to remove background noise from the image processed data.
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Abstract
A device for scanning a document includes a photoelectric conversion unit which scans a document, and supplies image data of the scanned document, a background detecting unit which detects a background level of the image data, an image processing unit which applies one or more types of image processing to the image data, and applies image processing identical to the one or more types of image processing to the detected background level, and a background removal unit which removes background noise from the image data having undergone the image processing according to a threshold that is derived from the background level having undergone the image processing.
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Citations
35 Claims
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1. A device for scanning a document, comprising:
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a photoelectric conversion unit which scans a document, and supplies image data of the scanned document; a background detecting unit which detects a background level of the image data so as to produce original background level value data that is separate from and not part of the image data and indicative of the background level; an image processing unit which applies one or more types of image processing to the image data, and applies image processing identical to said one or more types of image processing to the original background level value data to produce image processed modified background level value data; and a background removal unit which generates a threshold derived from the image processed modified background level value data, and which utilizes said generated threshold to remove background noise from the image processed data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for scanning a document, comprising:
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a memory unit which stores therein scanned image data and original background level value data that is separate from the scanned image data; an input unit which receives a user instruction making a choice between performing of background noise removal on the scanned image data and non-performing of the background noise removal on the scanned images; and a background removal unit which generates a threshold derived from image processed modified background level value data, and which utilizes said generated threshold to remove background noise from the scanned image data stored in said memory unit in response to the user instruction indicative of performing of the background noise removal, and refrains from removing background noise from the scanned image data stored in said memory unit in response to the user instruction indicative of non-performing of the background noise removal, wherein in response to the user instruction indicative of performing of the background noise removal, said original background level value data is modified by image processing identical to that applied to the scanned image data to produce said image processed modified background level value data. - View Dependent Claims (14)
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15. A method of processing image data, comprising:
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detecting a background level of image data of a scanned document so as to produce original background level value data indicative of the background level; applying one or more types of image processing to the image data so as to generate image processed data, and applying image processing identical to said one or more types of image processing to the original background level value data that is separate from and not part of the image data to produce modified background level value data; generating a threshold derived from image processed modified background level value data and removing background noise from the image processed data having according to the generated threshold that is derived from the image processed modified background level value data. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method of scanning a document, comprising:
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storing scanned image data and original background level value data that is separate from the scanned image data in memory; accepting a user instruction making a choice between performing of background noise removal on the scanned image data and not-performing of the background noise removal on the scanned image data; and removing background noise from the scanned image data stored in said memory in response to the user instruction indicative of performing of the background noise removal, and refraining from removing background noise from the scanned image data stored in said memory in response to the user instruction indicative of non-performing of the background noise removal, wherein in response to the user instruction indicative of performing of the background noise removal, modifying said original background level value data by image processing identical to that applied to the scanned image data and generating a threshold derived from image processed modified background level value data by which to remove the background noise. - View Dependent Claims (27)
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28. A device for scanning a document, comprising:
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scanning means for scanning a document, and for supplying image data of the scanned document; background detecting means for detecting a background level of the image data so as to produce original background level value data that is separate from and not part of the image data and indicative of the background level; image processing means for applying one or more types of image processing to the image data so as to generate image processed data, and for applying image processing identical to said one or more types of image processing to the original background level value data to produce image processed modified background level value data; and background removal means for generating a threshold derived from the image processed modified background level value data, and for utilizing said generated threshold to remove background noise from the image processed data. - View Dependent Claims (29)
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30. A device for scanning a document, comprising:
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a background detecting unit which detects background level data of image data of a scanned document; a threshold generating unit which determines a threshold based on the detected background level data so as to produce an original threshold level value indicative of the threshold; a clipping unit which clips to the threshold the image data above the original threshold level value; an image processing unit which applies one or more types of image processing to the clipped image data so as to generate clipped image processed data and further to the original threshold level value to produce a modified threshold level value; and a background removal unit which removes background noise from the clipped image data according to a generated threshold that is derived from the modified threshold level value. - View Dependent Claims (31, 32, 33)
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34. A device for scanning a document, comprising:
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background detecting means for detecting a background level of image data of a scanned document; threshold generating means for determining a threshold based on the detected background level so as to produce an original threshold level value that is separate from and not part of the clipped image data and indicative of the threshold; clipping means for clipping to the original threshold the image data above the threshold; image processing means for applying one or more types of image processing to the clipped image data so as to generate clipped processed data and further to the original threshold level value to produce a modified threshold level value; and background removal means for removing background noise from the clipped image data according to a generated threshold that is derived from the modified threshold level value. - View Dependent Claims (35)
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Specification