Optical Signature for Document Image Correction
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Solution Overview
Problem
Existing document authentication methods struggle with image distortion caused by folds and wrinkles in documents, particularly in varied shapes and sizes, which hinders the accurate decoding of optical identifiers and barcodes by document readers.
Innovation Solution
A method and system that utilize a unique optical pattern embedded in the document, which can be decoded to determine an optical signature associated with geometric information, allowing for image correction techniques to generate a corrected document image, even when the document is distorted, without occupying significant space or being visible.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If robust optical identifiers with orientation marks and quiet zones are used to enable decoding despite folds and wrinkles, then decoding reliability is improved, but document space is significantly reduced
Solution Approach 1:
The patent changes the parameters of the optical identifier by using a simplified pattern of alternating light and dark vertical bars instead of robust identifiers with orientation marks and quiet zones. This reduced-parameter approach maintains sufficient decoding capability while significantly reducing the space occupied on the document.
Solution Approach 2:
The patent extracts only the essential decoding information from the optical identifier, removing unnecessary components such as orientation marks and quiet zones that are present in robust identifiers. This extraction maintains the core function of decoding while minimizing space consumption.
2Measurement precision
If geometric information about the document is known to apply trapezoidal correction techniques, then image correction accuracy is improved, but document variety is reduced
Solution Approach 1:
The patent enables the document itself to provide the geometric information needed for correction through its optical identifier pattern. The pattern of alternating light and dark vertical bars serves dual purposes: it identifies the document type for correction parameters and maintains the document's authentic appearance without requiring additional geometric markers.
Solution Approach 2:
The optical identifier pattern serves multiple functions simultaneously: it acts as both an authentication marker and a source of geometric information for image correction. This multi-functionality allows the system to handle various document types with different shapes and sizes using a unified approach.
Data Source
AI summary
A method and system for performing document image correction using a document reader is disclosed. The method includes generating a document image representative of a document having a deformation; decoding an optical pattern embedded in the document from the document image to determine an optical signature for the document; receiving document classification data associated with the optical signature; and applying an image correction technique to the document image based on the document classification data to generate a corrected document image. A document capable of being read by a document reader is also disclosed. The document includes a substrate and an optical pattern embedded on the substrate. The optical pattern is part of a background pattern printed on the substrate. The optical pattern defines an optical signature unique to the particular class of document and is associated with document classification data for the document.