Multiple Digital Watermarking With Orthogonal Frequency Embedding
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Solution Overview
Problem
Conventional digital watermarking techniques face challenges in maintaining detection efficiency when multiple watermarks are embedded in the same digital media, leading to mutual interference and compromised reliability.
Innovation Solution
The method involves generating a second watermark that is orthogonal to the first watermark in the frequency domain and with different granularity, allowing independent detection of both watermarks without interference, and embedding additional information such as time, device, and user identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple watermarks are embedded in the same digital media, then traceability information can be enhanced, but mutual interference between watermarks degrades detection efficiency
Solution Approach 1:
The patent segments the frequency domain into multiple orthogonal subspaces, assigning each watermark to a distinct frequency region. This segmentation prevents spectral overlap and mutual interference between watermarks, allowing each watermark to be detected independently with high efficiency while maintaining enhanced traceability through multiple embedded watermarks.
Solution Approach 2:
The patent transitions from spatial domain watermarking to frequency domain watermarking, utilizing orthogonal frequency subspaces as an additional dimension for watermark embedding. By mapping watermarks to different frequency dimensions rather than overlapping them in the spatial domain, the system achieves both high detection efficiency and enhanced traceability.
2Reliability
If multiple watermarks are embedded to track digital media handling, then forensic traceability is improved, but the complexity of watermark management increases
Solution Approach 1:
The patent creates a universal watermarking system where a single orthogonal frequency domain framework can accommodate multiple watermarks with different purposes (ownership, traceability, copyright). This multi-functional approach simplifies management by providing a unified methodology for embedding, detecting, and managing diverse watermarks through consistent orthogonal frequency assignments.
Solution Approach 2:
The patent manages watermark complexity by changing frequency domain parameters (carrier frequencies, modulation depths, spatial positions) rather than managing multiple separate watermarking systems. By controlling watermarks through parameter variations within a unified orthogonal framework, the system achieves enhanced forensic traceability while maintaining manageable complexity.
Data Source
AI summary
The present invention relates to a method and apparatus for hiding information in digital media using watermark embedding, and more particularly, to a method and apparatus for embedding a watermark that is robust against redundant insertion. According to one embodiment of the present invention, a watermark embedding method for digital media comprises: receiving first digital media into which a first watermark has been embedded; generating a second watermark; embedding the second watermark into the first digital media to generate second digital media; and outputting the second digital media. The resulting second digital media may be characterized in that the first watermark and the second watermark are each individually detectable.