Video Carrier Signal Modulation via Pixel Intensity Matrix
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Solution Overview
Problem
Existing methods for encoding carrier signals in video signals are not robust enough to prevent unauthorized detection and removal, as they can be easily stripped or altered, compromising security and access control.
Innovation Solution
A method that modulates a carrier signal within a video signal using a spread spectrum technique, creating a three-dimensional matrix to optimize intensity changes across pixels, making the carrier signal more detectable without noticeable distortion to the viewer, and utilizing a decoder to verify the presence of the carrier signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the carrier signal is transmitted with high intensity in the active portion of the video signal, then the detectability of the carrier signal is improved, but the visual quality of the video signal deteriorates
Solution Approach 1:
The patent applies local quality by selectively modifying only specific pixels in the video signal rather than the entire image. The carrier signal is embedded by adjusting the intensity of selected pixels in a pattern that is imperceptible to the human eye, while maintaining overall visual quality. This localized modification allows the carrier signal to be detected through pixel-level analysis without degrading the macroscopic appearance of the video.
Solution Approach 2:
The patent utilizes parameter changes by varying the intensity levels of specific pixels in a controlled manner. By changing the brightness parameter of selected pixels according to a predetermined pattern, the carrier signal is encoded into the video signal. The intensity modifications are carefully calibrated to remain below the threshold of human perception while being detectable by electronic systems.
2Ease of manufacture
If conventional modulation methods are used to transmit the carrier signal, then the simplicity of the encoding process is maintained, but the security against unauthorized removal is compromised
Solution Approach 1:
The patent applies dimensionality change by transitioning from conventional one-dimensional or two-dimensional modulation approaches to a three-dimensional pixel matrix approach. The carrier signal is embedded across multiple spatial dimensions (horizontal and vertical pixel positions) in a pattern that creates a distributed code. This three-dimensional distribution makes the signal much more difficult to remove or alter without leaving detectable traces, while the encoding process remains computationally manageable.
Solution Approach 2:
The patent implements nesting by embedding the carrier signal within the structure of the video signal itself. The carrier signal pattern is nested across multiple levels of pixel data, with the modulation pattern repeated at different scales and positions. This nested structure ensures that the carrier signal is deeply integrated into the video signal, making it resistant to removal while maintaining compatibility with standard video processing systems.
3Illumination intensity
If the carrier signal is placed in non-viewable scan lines, then the visual quality is preserved, but the signal can be easily stripped by programming operators
Solution Approach 1:
The patent applies the inversion principle by reversing the conventional approach of placing carrier signals in non-viewable areas. Instead of hiding the signal in blank or non-viewable scan lines, the patent embeds the carrier signal within the active, viewable portion of the video signal. The signal is distributed across specific pixel patterns that are visually imperceptible but electronically detectable, thereby inverting the traditional placement strategy to achieve both visual quality preservation and enhanced security.
Solution Approach 2:
The patent uses an intermediary approach by introducing a specific pixel intensity pattern as a mediator between the carrier signal and the video signal. This intermediary pattern serves as a carrier for the encoded information, distributed across the video pixels in a way that is invisible to human eyes but detectable by electronic systems. This intermediary pattern protects the signal from easy removal by creating a distributed, pattern-based encoding that is difficult to strip without affecting the overall video structure.
Data Source
AI summary
A method for encoding a carrier signal in a video signal, the video signal having one or more frames, the frames each having a first field and a second field, the first field and the second field of each frame having a plurality of scan lines, each having a plurality of pixels with an intensity value indicating brightness, the method comprising selectively designating the plurality of scan lines of the first field of the one or more frames as up lines or down lines, calculating an optimum amount of adjustment to the pixels of the up lines and the down lines, and selectively increasing the intensity value of pixels of the up lines and decreasing the intensity value of pixels of the down lines by the optimum amount of adjustment thereby modulating the video signal with a carrier signal and creating a modulated video signal.