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US 11,363,166 B2Granted
Duplex scanning content alignment
AssigneeToshiba Tec Kabushiki Kaisha
InventorMitchell G. Marks
Life of this patent
Estimating the term…
Abstract
There is disclosed an apparatus and method of aligning content put through a duplex scanner. By performing operations on data extracted from physical documents, digital documents that would otherwise appear skewed can be un-skewed. The process compares two images, e.g. a front and a back page for a document, and determines how they are offset from one another. The process uses a projection profile error minimization technique to calculate a translation for one or both pages to digitally align the margins for a digital document such that the margins match.
Claims6
A multifunction peripheral comprising:
- a computing device including a processor and a memory coupled to the processor;
- and
- an automatic document feeder (ADF);
- a duplex optical scanner configured to scan a front side and a back side of a physical document that is fed through the ADF,
- the memory storing program instructions that, when executed by the processor, cause the computing device to perform actions comprising:
- causing the duplex optical scanner to scan the front and backs sides of the physical document and create a digital document from the physical document;
- detecting a back page of the digital document created as a result of scanning the back side of the physical document and a front page of the digital document created as a result of scanning the front side of the physical document;
- pre-processing the digital document by performing binarization and skew correction on the back page and the front page;
- performing horizontal and vertical projection profile error analysis on the binarized front and back pages;
- calculating horizontal and vertical offsets using projection profile error minimization on the binarized front and back pages;
- and
- translating the contents of the front and back pages of the digital document based on the horizonal and vertical alignment offsets.
9 more elements
Dependencies are inferred from the claim text.