Digital Watermark Segmentation for Composite File Integrity
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Solution Overview
Problem
Existing digital watermark technologies face challenges in ensuring the integrity of composite files, as independent watermark embedding and verification mechanisms lead to increased computation and interactive operations, particularly when multiple carriers are involved.
Innovation Solution
A method and system that split a digital watermark into sub-watermarks corresponding to the number of carriers in a composite file, embedding each sub-watermark in a respective carrier and integrating them into a target file, allowing for efficient protection and verification of all carriers with reduced computational and interactive operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If independent watermark embedding mechanisms are used for each carrier in a composite file, then the integrity of each carrier can be protected, but the computational burden and interactive operations are multiplied
Solution Approach 1:
The patent divides a single watermark into multiple sub-watermarks, with each sub-watermark embedded in a different carrier within the composite file. This segmentation allows the watermark protection to be distributed across multiple carriers, ensuring that each carrier contributes to the overall integrity verification while using a unified watermark generation mechanism, thereby avoiding the need for multiple independent watermark systems.
Solution Approach 2:
The patent combines multiple carriers into a single composite file structure, where all carriers share a common watermarking system. Instead of treating each carrier independently with separate watermarks, the system merges them under one unified watermark that is split across all carriers, reducing the overall computational complexity and interactive operations required for watermark embedding and verification.
2Reliability
If multiple digital watermarks are used to protect different carriers (source file and signature image), then both carriers can be protected, but the amount of computation and interactive operations are multiplied
Solution Approach 1:
The patent creates a universal watermarking system where a single watermark serves multiple functions across different carrier types (source files, signature images, etc.). The watermark is designed to be adaptable to various carrier formats and can be embedded in any carrier within the composite file, eliminating the need for separate watermarking algorithms for different file types and improving overall processing efficiency.
Data Source
AI summary
This application relates to the field of digital watermark technologies and discloses a digital watermark embedding method and extraction method, a digital watermark embedding apparatus and extraction apparatus, and a digital watermark system. The method includes obtaining a digital watermark of a composite file, splitting the digital watermark into N sub-watermarks according to a carrier quantity N of the composite file, each sub-watermark being corresponding to partial content of the digital watermark, embedding an ith sub-watermark in an ith carrier of the composite file, to obtain an ith target carrier, and integrating N target carriers into a target file. This application resolves a problem in the related technology that a digital watermark technology cannot ensure integrity of an order file, and protects carriers of a composite file, thereby ensuring security and integrity of the composite file.