Digital Video Watermarking Chrominance Encoding
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Solution Overview
Problem
Existing video watermarking techniques face limitations in achieving high bit rates without perceivable distortion due to the human visual system's sensitivity to luminance changes, and they struggle with error-free transmission of additional information, especially when the video signal is compressed using MPEG-1 and MPEG-2 encoding systems.
Innovation Solution
The system imparts additional information on the chrominance component of the video signal, using coding techniques such as channel coding, interleaving, and differential encoding to ensure error-free transmission, and employs texture masking to manage distortion, allowing for higher bit rates and robust recovery of the watermarking data even after compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional information is encoded in the luminance component of the video signal, then the human visual system perceives the watermark, but the bit rate is limited to below 120 bits per second to avoid perceivable distortion
Solution Approach 1:
The patent changes the parameter of which video component is used for watermarking from luminance to chrominance. By encoding additional information in the chrominance component instead of luminance, the system exploits the human visual system's lower sensitivity to chrominance changes, thereby enabling higher bit rates (greater than 120 bits per second) without perceivable distortion while maintaining watermark reliability.
2Productivity
If the bit rate of additional information is increased beyond 120 bits per second in the luminance component, then more information can be transmitted, but perceivable distortion occurs to the human visual system
Solution Approach 1:
The patent changes the parameter of which video component is used for watermarking from luminance to chrominance. By encoding additional information in the chrominance component, the system allows higher bit rates (greater than 120 bits per second) without perceivable distortion because the human visual system is much less sensitive to chrominance changes compared to luminance changes.
Solution Approach 2:
The patent uses the chrominance component as an intermediary carrier for additional information. Instead of directly embedding data in the luminance component where it would be visible, the system uses chrominance as a mediator that can carry higher bit rates of additional information without being perceived by the human visual system.
3Productivity
If additional information is impressed upon the chrominance component at high bit rates, then higher data rates can be achieved, but error-free transmission becomes difficult due to variability of underlying images
Solution Approach 1:
The patent applies preliminary coding to the additional information before embedding it in the chrominance component. By pre-processing the data with appropriate coding schemes, the system prepares the information in a form that is more robust to the variability of underlying images, enabling error-free transmission even at high bit rates greater than 150 bits per second.
4Productivity
If the video signal is compressed using MPEG-1 and MPEG-2 encoding systems, then the video can be efficiently transmitted and stored, but the watermarking data may be lost or corrupted
Solution Approach 1:
The patent changes the parameter of which video component is used for watermarking from luminance to chrominance. This parameter change makes the watermarking data more robust to MPEG-1 and MPEG-2 compression because the chrominance component is typically compressed with lower bit rates and less aggressive quantization than luminance, allowing the watermarking data to survive compression and be recovered afterward.
Data Source
AI summary
Each bit of information that is impressed upon a video signal is impressed upon each pixel of a block of pixels of the video signal a video signal so as to reduce errors in transmission of the additional information. Prior to impression, the additional information may be further coded, e.g., using channel coding, interleaving, and differential encoding. A receiver performs complimentary processes to recover the additional data.