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US 5,351,138 AGranted
Image area discriminating device
AssigneeRicoh Company, Ltd.
InventorsTomio Sasaki, Shinji Kobayashi, Masahito Obata
Life of this patent
Estimating the term…
Abstract
An image area dicriminating device for a digital copier, facsimile machine, scanner or similar imaging equipment. The device determines whether areas constituting an input image each has undergone dot processing or not automatically.
Claims10
A device for discriminating an image area, comprising:
- a) MTF (Modulation Transfer Function) correcting means for executing MTF correction with input image data;
- and
- b) record dot and non-record dot detecting means including:
- 1) means for receiving an MTF corrected image signal outputted by said MTF correcting means as input image data;
- 2) means for comparing (1) a bi-dimensional pattern of said input image data with (2) a predetermined detection pattern, so as to detect a record dot and a non-record dot;
- and
- 3) means for producing a result of comparison.
4 more elements
A device for discriminating an image area, comprising:
- image reading means for dividing a document image into a number of small pixel areas, for reading image density of each of said image areas, and for outputting an electric signal associated with said image density;
- first subscan magnification changing means for driving the document and said image reading means relative to each other for scanning said document, and for adjusting, in response to a designated magnification change ratio, a scanning speed so as to change a magnification change ratio in a subscanning direction;
- converting means for converting an analog signal output by said image reading means to a digital signal;
- main-scan magnification changing means for changing, in response to a designated magnification change ratio, a magnification change ratio by thinning or interpolating said digital signal output by said converting means in a main scanning direction;
- record dot and non-record dot detecting means for comparing a bi-dimensional pattern of said digital signal with a predetermined record dot and non-record dot detection pattern, and for outputting a result of comparison;
- and
- second subscan magnification changing means for thinning or interpolating image data output by said first subscan magnification changing means on the basis of a designated magnification change ratio.
4 more elements
A device for discriminating an image area, comprising:
- image reading means for dividing a document image into a number of small pixel areas, for reading image density of each of said image areas, and for outputting an electric signal associated with said image density;
- subscan magnification changing means for driving the document and said image reading means relative to each other so as to scan said document, and for adjusting, in response to a designated magnification change ratio, a scanning speed so as to change a magnification change ratio in a subscanning direction;
- converting means for converting an analog signal output by said image reading means to a digital signal;
- main-scan magnification changing means for changing, in response to a designated magnification change ratio, a magnification change ratio by thinning or interpolating said digital signal output by said converting means in a main scanning direction;
- and
- record dot and non-record dot detecting means for comparing a bi-dimensional pattern of said digital signal with a predetermined record dot and non-record dot detection pattern, and for outputting a result of comparison.
3 more elements
Dependencies are inferred from the claim text.