Electronic Watermark Embedding in Image Coding Parameters
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Solution Overview
Problem
Existing image coding technologies lack a reliable method to securely embed electronic watermarks in moving images and effectively identify falsifications, making it difficult to authenticate the integrity of recorded images, especially in legal and investigative contexts.
Innovation Solution
An image coding technology that uses a one-way function to generate embedding position information based on time-continuous data, allowing for the secure embedding of electronic watermarks in coding parameters within coding blocks of moving images, and a method to identify falsifications by comparing extracted watermark information with reference data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electronic watermark is embedded in coding parameters of moving images, then image authentication capability is improved, but vulnerability to detection and falsification remains
Solution Approach 1:
The patent segments the watermark embedding process by dividing the image into multiple coding blocks and embedding watermark bits in different coding parameters (motion vectors, quantization matrices, intra-prediction modes) across these blocks. This segmentation distributes the authentication information throughout the image structure, making it harder to detect and falsify any single portion without affecting the overall authentication.
Solution Approach 2:
The patent embeds watermark information in the temporal dimension by utilizing time-continuous characteristics. The embedding position in each frame is determined by a one-way function that incorporates temporal information, creating a time-based authentication layer that prevents falsification by ensuring the watermark positions evolve predictably across frames according to the one-way function.
2Ease of operation
If conventional watermark embedding is used in coded images, then ease of operation is improved, but ability to prevent image falsification deteriorates
Solution Approach 1:
The patent performs preliminary actions by determining embedding positions using a one-way function before actually embedding the watermark bits. The embedding position information is generated in advance based on temporal continuity requirements, and this pre-determined positioning strategy is applied consistently throughout the coding process, simplifying the overall operation while maintaining strong falsification prevention.
Solution Approach 2:
The patent introduces an intermediary mechanism - the one-way function - that mediates between the temporal information and the embedding position determination. This intermediary transforms time-based information into specific embedding positions without being reversible, thereby preventing falsification while maintaining ease of operation through automated position calculation.
3Ease of operation
If watermark embedding position is fixed, then ease of operation is improved, but temporal continuity authentication capability deteriorates
Solution Approach 1:
The patent makes the embedding position dynamic by linking it to temporal information through a one-way function. Instead of fixed positions, the embedding position changes dynamically across frames based on the temporal continuity requirements. This dynamic positioning maintains ease of operation through automated calculation while enabling temporal continuity authentication, as falsified frames would exhibit incorrect positional patterns.
Data Source
AI summary
An image coding device adapted to code time-continuous pictures is provided. An embedding position information conversion unit acquires embedding position information indicating a position in a picture, by using a one-way function based on time-continuous information. An image coding unit selects a coding block in the picture based on the embedding position information, embeds electronic watermark information in a coding parameter used to code the coding block, and codes the coding block by using the coding parameter in which the electronic watermark information is embedded.