Watermarking Phase Shifting Information Density
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Solution Overview
Problem
Current watermarking techniques face limitations in increasing information capacity and density due to the need for frequency ranges that are imperceptible to humans, which restricts the amount of information that can be conveyed without compromising the media signal quality.
Innovation Solution
The use of phase shifting in watermarking, where the starting phase value of watermark components is shifted, allowing for additional information to be encoded without increasing frequency content, making it imperceptible to humans but detectable by decoders, while maintaining compatibility with existing decoding methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If frequency ranges are selected to be imperceptible to humans for watermark embedding, then watermark detectability is improved, but the amount of information that can be conveyed is limited
Solution Approach 1:
The patent transitions from amplitude-based watermark embedding to phase-based embedding. By utilizing phase shifts of existing frequency components rather than adding new frequencies or modifying amplitudes, the system embeds information in a new dimension (phase) that does not compromise media signal quality while increasing information capacity.
Solution Approach 2:
The patent changes the watermark embedding parameter from amplitude to phase. By modulating the phase of existing frequency components rather than their amplitudes, the system achieves higher information density without affecting the perceptual quality of the media signal, as phase changes are less noticeable to human listeners than amplitude changes.
2Loss of information
If more frequency components are added to increase watermark information density, then information capacity is improved, but the complexity of the media signal increases
Solution Approach 1:
The patent merges multiple watermark components into a single frequency bin by using phase shifts. Instead of adding multiple frequency components to convey different parts of the watermark, the system uses phase variations of a single frequency component to encode multiple bits of information, thereby reducing frequency content complexity while maintaining information density.
Solution Approach 2:
The patent uses phase as an additional dimension for encoding information. By utilizing the phase angle (0-360 degrees) of frequency components as an encoding dimension, the system can represent multiple bits of information within a single frequency bin, avoiding the need to add multiple frequency components and thereby reducing overall signal complexity.
3Loss of information
If watermark duration is extended to convey more information, then information capacity is improved, but the time required for watermark transmission increases
Solution Approach 1:
The patent changes the encoding parameter from temporal duration to phase modulation depth. By using phase shifts to encode multiple bits of information within each symbol period, the system increases information capacity without extending the watermark duration, as the phase modulation allows more bits to be transmitted within the same time frame.
Solution Approach 2:
The patent utilizes phase as an additional encoding dimension that operates independently of time. By encoding information in the phase domain rather than extending the temporal duration, the system achieves higher information capacity without increasing the time required for watermark transmission, as phase modulation allows parallel information encoding within the same time window.
Data Source
AI summary
Apparatus, devices, systems, methods, and articles of manufacture are disclosed for watermarking with phase shifting. Example watermark decoding apparatus disclosed herein are to identify watermark components in a media signal, determine a phase shift pattern associated with the watermark components in the media signal, the phase shift pattern based on one or more phase references, and detect a symbol of a watermark based on the phase shift pattern, the watermark associated with the watermark components in the media signal.