Watermark Embedding in Digital Video Recorders
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Solution Overview
Problem
Existing methods for embedding watermarks into images and digital video recorders fail to authenticate images in real-time and prevent forgery/alternation effectively, especially when compression is involved, and lack interoperability between spatial and transformation domains.
Innovation Solution
A method that embeds robust and fragile watermarks simultaneously with compression using pseudo-random sequences circular-shifted by a specific distance, applied in both spatial and transformation domains, including wavelet and discrete cosine transforms, allowing for real-time authentication and detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If watermark embedding is performed separately after compression, then compression efficiency is improved, but real-time authentication capability deteriorates
Solution Approach 1:
The patent combines watermark embedding and compression into a single integrated process. The watermark embedding unit operates concurrently with the compression unit, sharing the same processing timeline and resource allocation, thereby achieving real-time authentication without compromising compression efficiency.
Solution Approach 2:
The system performs preliminary watermark embedding before final compression output, ensuring that authentication can be conducted in real-time on the compressed data stream. This preliminary action allows the watermark to be embedded at the optimal point in the processing pipeline, enabling subsequent real-time verification.
2Reliability
If only robust watermark is embedded, then forgery prevention is improved, but forgery location verification capability deteriorates
Solution Approach 1:
The patent divides the watermark into two distinct types: robust watermark for forgery prevention and fragile watermark for forgery location verification. Each watermark type is embedded separately and serves its specific function, allowing the system to simultaneously achieve both forgery prevention and location verification capabilities.
Solution Approach 2:
Different watermark types are embedded with different characteristics suited to their specific functions. The robust watermark uses embedding methods optimized for resistance to forgery, while the fragile watermark uses methods optimized for detecting and locating alterations, thereby providing localized quality for each function.
3Ease of manufacture
If watermark embedding is performed in spatial domain only, then embedding simplicity is improved, but interoperability with transformation domain deteriorates
Solution Approach 1:
The patent implements a universal watermark embedding system that can operate in both spatial domain and transformation domain. The same watermark data can be embedded using spatial domain methods and then extracted using transformation domain methods, or vice versa, providing interoperability across different processing domains while maintaining embedding simplicity.
Data Source
AI summary
The present invention relates to a method for embedding and detecting a watermark where a forgery/alternation of an image can be identified and the location of forgery/alternation can be verified by embedding and detecting a watermark into a digital image which is shot in real time. The watermark is generated by using a quantized coefficient after frequency transform used in the compression process. By embedding this into an image, the image can be compressed simultaneously with the embedded watermark. The present invention relates to a method for embedding a robust watermark which embeds a random sequence circular shifted from an original pseudo random sequence by the distance d as the watermark is embedded into an image, and a method for generating and embedding the watermark by using a DCT coefficient quantized during an MPEG compression process of the image.