System for aligning document images when scanned in duplex mode
First Claim
Patent Images
1. A method for copying a multi-page document comprising:
- scanning in a plurality of document pages to capture image data for each of the plurality of pages;
storing the image data for each of the plurality of pages; and
comparing, using a distance metric, the image data for each of the plurality of pages to identify twice scanned pages, wherein the distance metric is at least one of a Hausdorff distance metric and an Euclidean distance metric.
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Abstract
A system and method for handling duplex documents by exploiting bleed-through of the image on the back side of a document. The images of the back sides and front sides of documents are associated with one another to assure correct output in copying, faxing, scanning, etc. This increases reliability, eases recovery from errors including paper jams. Improved document handling capabilities also include avoiding twice duplicated and skipped pages and correcting page orientation errors.
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Citations
21 Claims
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1. A method for copying a multi-page document comprising:
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scanning in a plurality of document pages to capture image data for each of the plurality of pages; storing the image data for each of the plurality of pages; and comparing, using a distance metric, the image data for each of the plurality of pages to identify twice scanned pages, wherein the distance metric is at least one of a Hausdorff distance metric and an Euclidean distance metric. - View Dependent Claims (2, 3)
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4. A copier comprising:
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a scanner configured to scan a plurality of pages to capture image data for each page of the plurality of pages; a feature extractor module configured to extract a feature set for each page of the plurality of pages from the image data for the page; a comparator module configured to perform comparisons, using a distance metric, between the extracted feature sets for the plurality of pages to identify pages from the plurality of pages which have been scanned more than once, wherein the distance metric is at least one of a Hausdorff distance metric and an Euclidean distance metric; and a printing module configured to print the plurality of pages based on the image data for the pages, wherein a single copy is printed for image data corresponding to the pages which have been scanned more than once. - View Dependent Claims (5)
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6. An apparatus for performing a first function on a plurality of pages, the apparatus comprising:
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a scanner configured to scan the plurality of pages to capture image data for each page of the plurality of pages; a feature extractor module configured to extract a feature set for each page of the plurality of pages from the image data for the page; a comparator module configured to perform comparisons, using a distance metric, between the extracted feature sets for the plurality of pages to identify pages from the plurality of pages which have been scanned more than once, wherein the distance metric is at least one of a Hausdorff distance metric and an Euclidean distance metric; and a function module configured to perform the first function on the plurality of pages based on the image data for the pages, wherein the first function is performed once on image data corresponding to the pages which have been scanned more than once. - View Dependent Claims (7, 8, 9)
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10. A method of performing a first function on a plurality of pages, the method comprising:
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scanning the plurality of pages to capture image data for each page of the plurality of pages; extracting a feature set for each page of the plurality of pages from the image data for the page; performing comparisons, using a distance metric, between the extracted feature sets for the plurality of pages to identify pages from the plurality of pages which have been scanned more than once, wherein the distance metric is at least one of a Hausdorff distance metric and an Euclidean distance metric; and performing the first function on the plurality of pages based on the image data for the pages, wherein the first function is performed once on image data corresponding to the pages which have been scanned more than once. - View Dependent Claims (11, 12, 13)
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14. A computer program product stored on a computer-readable medium for performing a first function on a plurality of pages, the computer program product comprising:
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code for scanning the plurality of pages to capture image data for each page of the plurality of pages; code for extracting a feature set for each page of the plurality of pages from the image data for the page; code for performing comparisons, using a distance metric, between the extracted feature sets for the plurality of pages to identify pages from the plurality of pages which have been scanned more than once, wherein the distance metric is at least one of a Hausdorff distance metric and an Euclidean distance metric; and code for performing the first function on the plurality of pages based on the image data for the pages, wherein the first function is performed once on image data corresponding to the pages which have been scanned more than once. - View Dependent Claims (15, 16, 17)
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18. A computer program product stored on a computer-readable medium for copying a multi-page document, the computer program product comprising:
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code for scanning in a plurality of document pages to capture image data for each of the plurality of pages; code for storing the image data for each of the plurality of pages; and code for comparing, using a distance metric, the image data for each of the plurality of pages to identify twice scanned pages, wherein the distance metric is at least one of a Hausdorff distance metric and an Euclidean distance metric.
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19. A copier comprising:
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a scanner configured to scan a plurality of pages to capture image data for each page of the plurality of pages; a feature extractor module configured to extract a feature set for each page of the plurality of pages from the image data for the page, the feature set comprising CCITT Group IV pass codes; a comparator module configured to perform comparisons between the extracted feature sets for the plurality of pages to identify pages from the plurality of pages which have been scanned more than once; and a printing module configured to print the plurality of pages based on the image data for the pages, wherein a single copy is printed for image data corresponding to the pages which have been scanned more than once.
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20. An apparatus for performing a first function on a plurality of pages, the apparatus comprising:
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a scanner configured to scan the plurality of pages to capture image data for each page of the plurality of pages; a feature extractor module configured to extract a feature set for each page of the plurality of pages from the image data for the page, the feature set comprising CCITT Group IV pass codes; a comparator module configured to perform comparisons between the extracted feature sets for the plurality of pages to identify pages from the plurality of pages which have been scanned more than once; and a function module configured to perform the first function on the plurality of pages based on the image data for the pages, wherein the first function is performed once on image data corresponding to the pages which have been scanned more than once.
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21. A method of performing a first function on a plurality of pages, the method comprising:
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scanning the plurality of pages to capture image data for each page of the plurality of pages; extracting a feature set for each page of the plurality of pages from the image data for the page, the feature set comprising CCITT Group IV pass codes; performing comparisons between the extracted feature sets for the plurality of pages to identify pages from the plurality of pages which have been scanned more than once; and performing the first function on the plurality of pages based on the image data for the pages, wherein the first function is performed once on image data corresponding to the pages which have been scanned more than once.
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Specification