Document Watermarking via Geometric Feature Modification
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Solution Overview
Problem
Existing document watermarking techniques fail to maintain encoded information integrity when documents are reproduced at different resolutions, printed in various formats, or scanned, leading to reduced robustness in digital rights management and security processes.
Innovation Solution
The method involves encoding information within periodically-varying features of documents, such as dashed lines, by modifying geometric properties, and dynamically updating the watermark with features like printer IDs, copy numbers, and user IDs, using error-correcting techniques and feature replication to enhance retrieval and security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing document watermarking techniques are used, then documents can be watermarked, but the encoded information integrity is not maintained when documents are reproduced at different resolutions, printed in various formats, or scanned
Solution Approach 1:
The watermark is divided into multiple segments distributed throughout the document. Each segment contains portions of the encoded information and can be independently recovered even if other segments are lost or degraded during reproduction processes.
Solution Approach 2:
The watermark encoding uses geometric properties of document features that can be detected across different resolutions and formats. The system transforms the watermark into parameters that remain stable through reproduction, scanning, and format conversion while allowing for error correction.
2Reliability
If watermarking is applied to track document flow and detect counterfeiting, then security is enhanced, but the watermark must remain imperceptible to prevent detection by unauthorized parties
Solution Approach 1:
The watermark is embedded within existing document features such as dashed lines, borders, or graphical elements. By modifying local geometric properties of these features rather than adding separate watermark elements, the watermark remains imperceptible while maintaining security functionality.
Solution Approach 2:
The watermark information is encoded by creating subtle variations in the geometric properties of existing document features. These variations are imperceptible copies of the original features that contain encoded authentication data for security verification.
Data Source
AI summary
A method for encoding information within a feature of a document. The method includes at least one computer processors determining information to encode within a document. The method further includes identifying a feature within the document to encode information within based, at least in part, on metadata of the document corresponding to the feature. The method further includes determining a set of geometric properties of one or more segments of the identified feature. The method further includes encoding, by one or more computer processors, a first bit of information of the determined information within a first segment of the feature within the document by modifying one or more geometric properties respectively associated with the first segment. The method further includes outputting the document with information encoded within the first segment.