Video Watermarking via GPS and Device Feedback
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Solution Overview
Problem
Conventional video transmission methods are not suitable for handheld mobile devices, and existing watermarking techniques are not robust enough to prevent unauthorized use of digital media, especially in mobile environments.
Innovation Solution
A system and method for video transmission and processing that utilizes GPS data to customize watermarking, embedding watermarks in video data before transmission to mobile devices, and adjusts watermarking based on device parameters and feedback signals to ensure secure and device-specific content delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional video transmission methods are used, then video can be transmitted to stationary devices, but the transmission is not suitable for handheld mobile devices
Solution Approach 1:
The system changes transmission parameters dynamically based on mobile device characteristics including screen resolution, processor capability, battery status, and signal strength. The video stream is re-encoded with different bitrates, resolutions, and formats depending on the device parameters detected, enabling universal compatibility across various mobile platforms while maintaining optimal viewing quality.
2Reliability
If visible watermarks are added to digital images to indicate ownership, then unauthorized use can be thwarted, but the watermarks are not robust against attacks due to filtering, removing and/or cropping the data
Solution Approach 1:
The patent replaces spatial watermarking (mechanical overlay) with frequency-domain watermarking using spread spectrum encoding. The watermark is embedded in the frequency spectrum of the video signal through modulation with pseudo-random codes, making it imperceptible to human eyes but detectable through correlation analysis. This frequency-based approach provides robustness against spatial manipulations like filtering, removing, and cropping operations.
Solution Approach 2:
The system embeds watermarks at multiple levels including bitstream level, macroblock level, and coefficient level in the frequency domain. The watermarking parameters such as embedding strength, frequency band selection, and code sequence are dynamically adjusted based on the specific mobile device and transmission conditions, creating device-specific watermarks that are difficult to remove without degradation.
3Loss of information
If invisible watermarks are used to avoid perceptible changes in the image, then the original data is preserved, but the watermarks have low signal amplitude and require large bandwidth
Solution Approach 1:
The patent transitions from spatial domain embedding to frequency domain embedding, utilizing the frequency spectrum as an additional dimension for watermark placement. This allows the watermark to be distributed across multiple frequency components rather than concentrated in a single spatial location, providing both imperceptibility and robustness. The spread spectrum encoding distributes the watermark energy across a wide frequency band, compensating for the low amplitude of individual frequency components.
4Reliability
If spread spectrum encoding is used to embed watermarks in the frequency domain, then the watermarks become more robust against attack, but the system complexity increases
Solution Approach 1:
The system uses pre-generated pseudo-random code sequences that are copied and reused as watermarks. Instead of creating unique complex watermarks for each device, the same pseudo-random code is applied across multiple devices and transmissions. The device-specific identification is achieved through variations in the code sequence or modulation parameters rather than fundamentally different watermarking systems, reducing overall system complexity.
Solution Approach 2:
The frequency-domain watermarking system serves multiple functions simultaneously: it provides copyright protection, device identification, location tracking (when combined with GPS data), and anti-piracy measures. The same spread spectrum encoding mechanism handles all these purposes, eliminating the need for separate watermarking systems for each function and reducing overall system complexity.
Data Source
AI summary
Methods and systems for video transmission and processing with customized watermarking delivery are disclosed and may include watermarking data at a communication device utilizing received global positioning (GPS) data and communicating the watermarked video data to a receiving communication device. The receiving communication device may verify the watermarked data, and may determine whether to render the received watermarked data based on the verification. The communication device may include an edge device, and may receive a feedback signal communicated from the receiving communication device. The watermarking of subsequently processed data may be adjusted based on the received feedback signal, which may include GPS data and/or device parameters corresponding to the receiving communication device. The watermarked video data communicated to the receiving communication device may be adjusted based on one or more device parameters corresponding to the receiving communication device and/or GPS information.