Multi-Robustness Watermarking for Content Processing Detection
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Solution Overview
Problem
Existing electronic watermarking techniques fail to effectively distinguish between authorized and unauthorized content processing, as they either detect changes but not the type, or prevent processing while missing authorized changes, and cannot hide evidence of processing.
Innovation Solution
The use of multiple electronic watermarks with varying robustness levels, embedded in different frequency bands of digital content, allows for the detection of processing and identification of processing types by evaluating the relationships between these watermarks, thereby preventing unauthorized copying and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a robust electronic watermark is embedded in content data, then the watermark can be detected even after content data has been greatly altered, but the watermark cannot distinguish between authorized and unauthorized processing
Solution Approach 1:
The patent divides the watermark system into multiple independent watermarks with different robustness characteristics. Each watermark is embedded in different frequency bands or regions of the content, allowing them to respond differently to various types of processing. This segmentation enables the system to both detect processing (through robust watermarks) and identify processing types (through fragile watermarks that respond specifically to certain operations).
Solution Approach 2:
Different watermarks are assigned different local qualities or characteristics. Some watermarks are designed to be highly robust against specific processing operations, while others are intentionally made fragile to those same operations. This local differentiation in watermark properties allows the system to simultaneously achieve reliable detection and processing type identification.
2Measurement precision
If a fragile electronic watermark is embedded in content data, then whether the data has been processed can be readily ascertained, but the watermark cannot be detected after copying or processing
Solution Approach 1:
The patent segments the watermark functionality by creating multiple watermarks with different fragility levels. Fragile watermarks provide precise processing detection by being easily altered by copying or processing operations, while robust watermarks ensure detection reliability by surviving these same operations. The combination of both types resolves the contradiction between precision and reliability.
Solution Approach 2:
The watermark system functions as a composite structure combining multiple watermarks with different properties. Just as composite materials combine different substances to achieve properties that individual materials cannot provide alone, this composite watermark system combines fragile and robust watermarks to achieve both precise processing detection and reliable watermark detection under various conditions.
3Adaptability or versatility
If multiple electronic watermarks with different robustness levels are embedded in content data, then processing type can be identified, but the device complexity increases
Solution Approach 1:
The patent designs a universal watermarking system where multiple watermarks share common embedding and detection mechanisms. Rather than creating entirely separate systems for each watermark type, the invention uses a unified framework that can handle different watermark robustness levels through configurable parameters. This multi-functionality approach reduces overall system complexity while maintaining the ability to identify different processing types.
Solution Approach 2:
The system manages complexity by controlling watermark parameters such as embedding strength, frequency band selection, and modulation depth. By carefully selecting and adjusting these parameters for each watermark, the system achieves diverse processing type identification capabilities without requiring fundamentally different detection algorithms for each watermark type. Parameter optimization allows the system to balance versatility with computational efficiency.
Data Source
AI summary
Enables identification and detection of processing and type of digital content, while using multiple electronic watermarks. One embodiment provides a data processing detection system having an embedding apparatus for adding a predetermined additional signal to digital content, including a watermark design unit and embedding signal generators for generating multiple types of additional signals, correlated with each other and of differing robustness from each other for the processing of the content data, and a synthesis unit for adding the multiple types of additional signals to the content data; and detection apparatus for detecting additional signals in the digital content, and for detecting the additional signals embedded by the embedding apparatus, including an individual detector for detecting in the content data multiple additional signals, and a determination unit for examining deterioration levels of the additional signals to determine the type of processing performed for the content data.