Video Watermarking via Inter-Frame Difference Manipulation
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Solution Overview
Problem
Existing digital watermarking techniques face challenges in making embedded information imperceptible to humans while maintaining robustness against manipulations such as compression, cropping, and distortion, particularly in video signals.
Innovation Solution
A method that manipulates the inter-frame difference measure of selected elements in a video signal across multiple frames using an algorithm to embed information, utilizing selective time-domain quantization and error correction coding, ensuring the embedded information is imperceptible and robust against various forms of tampering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital watermarking is applied to video signals using traditional methods, then information can be embedded in the video, but the watermark becomes perceptible to human consumers or vulnerable to manipulations such as compression, cropping, or distortion
Solution Approach 1:
The patent applies different watermarking strategies to different regions of the video frame based on their temporal characteristics. Regions with high inter-frame difference (such as moving objects) receive different treatment compared to regions with low inter-frame difference (such as static backgrounds). This local differentiation allows the watermark to be imperceptible in regions where it would otherwise be visible, while maintaining robustness in regions where the video content naturally varies.
Solution Approach 2:
The patent dynamically adjusts watermarking parameters based on inter-frame difference measures. By calculating the temporal variation of video content and adapting the watermark embedding strength and method accordingly, the system optimizes both imperceptibility and robustness. When inter-frame difference is high, the watermark can be stronger without being perceptible; when inter-frame difference is low, the watermark is reduced or modified to avoid visibility.
2Reliability
If the strength of watermark signal is increased to improve robustness against manipulations, then the watermark becomes more resistant to tampering, but the watermark becomes more perceptible to human consumers
Solution Approach 1:
The patent implements a dynamic watermarking system where the watermark signal strength and embedding method are continuously adjusted based on the temporal characteristics of the video content. The system calculates inter-frame difference measures in real-time and adapts the watermark parameters accordingly, creating a living watermarking system that responds to the video content rather than applying a static watermarking approach.
Solution Approach 2:
The system dynamically modifies watermarking parameters including embedding strength, frequency, and method based on the calculated inter-frame difference. This parameter adaptation allows the watermark to be imperceptible in static regions while maintaining robustness through stronger embedding in dynamic regions, effectively resolving the contradiction between robustness and imperceptibility.
3Object-affected harmful factors
If selective quantization is used to encode information in video frames, then the watermark can be embedded imperceptibly, but the robustness against compression and manipulation is reduced
Solution Approach 1:
The patent performs preliminary analysis of the video content to identify regions with high inter-frame difference before embedding the watermark. By pre-segmenting the video frame based on temporal characteristics and preparing a map of suitable embedding regions, the system can strategically place watermark information in areas where it will be both imperceptible and robust to compression and manipulation.
Solution Approach 2:
The system applies different embedding techniques and strengths to different regions of the video frame. Regions identified as having high temporal variation receive watermarking treatment that prioritizes robustness, while regions with low variation receive treatment that prioritizes imperceptibility. This localized approach allows the system to overcome the limitations of uniform selective quantization.
Data Source
AI summary
A digital watermarking system and method for embedding information in and extracting information from content items, such as video signals, are described. In a method for encoding or embedding information in a content item, a content item including a plurality of frames is accessed in which each of a number of elements within the frames is associated with an inter-frame difference measure representing changes in the element between two frames. Information for embedding in the content item is accessed. Symbols of the information are embedded in the content item by manipulating the inter-frame difference measure of a selected element through a number of frames using an algorithm and the information. The information is used by the algorithm to control the manipulation. The manipulated content item is output as a watermarked content item having the information embedded therein.