Image Processing with Low-Density Markers for Duplicate Document Verification
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Solution Overview
Problem
Existing methods for embedding information in printed documents do not account for the extraction of added information when the embedded area is identified in duplicated multiplexed documents, leading to authenticity issues.
Innovation Solution
An image processing apparatus that multiplexes a first predetermined pattern with a printing area and a second predetermined pattern with a marker area, where the second pattern has a lower density than the first, allowing for the embedding of document ID information that can be extracted even in duplicated documents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If information is embedded in printed documents using conventional methods, then the document can be printed, but the embedded information cannot be extracted from duplicated documents
Solution Approach 1:
The patent divides the printing medium into distinct areas: a printing area for document content and a marker area for embedding extractable information. This segmentation allows the embedded information to be located and extracted from duplicated documents, resolving the issue of information loss while maintaining printing functionality.
Solution Approach 2:
The patent applies different density characteristics to different areas: the marker area has lower density than the printing area. This local quality differentiation enables the embedded information to be distinguishable and extractable from duplicated documents, as the lower density area stands out against the higher density printing content.
2Measurement precision
If a uniform density pattern is used for embedding, then the embedding process is simple, but the extracted information cannot be reliably identified in duplicated documents
Solution Approach 1:
The patent implements different density levels in different areas: the marker area uses lower density while the printing area uses higher density. This local quality differentiation provides clear visual distinction that enables reliable identification of the embedded area in duplicated documents without requiring complex pattern designs.
Solution Approach 2:
The patent creates an asymmetric density distribution where the marker area deliberately has lower density than the printing area. This asymmetry provides a clear distinguishing feature that simplifies the identification process for extraction systems while maintaining overall pattern simplicity.
Data Source
AI summary
An image processing apparatus includes a print data acquisition unit configured to acquire print data to be printed on a printing medium, and a generation unit configured to generate multiplexed data by multiplexing a first predetermined pattern with a printing area where the print data is printed among areas of the printing medium and multiplexing a second predetermined pattern with a marker area different from the printing area among the areas of the printing medium, wherein the multiplexed second predetermined pattern has a density lower than that of the multiplexed first predetermined pattern on the printing medium.