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US 2021/0021730 A1Published application
Duplex scanning content alignment
AssigneeToshiba Tec Kabushiki Kaisha
InventorMitchell G. MARKS
Life of this patent
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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 optical scanner,
- the memory storing program instructions that, when executed by the processor, cause the computing device to perform actions comprising:
- causing the optical scanner to scan a physical document and create a digital document from the physical document;
- detecting a back page and a front page of the digital 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 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 digital document based on the horizonal and vertical alignment offsets.
8 more elements
Dependencies are inferred from the claim text.