Digital Watermarking System Resilience Against Image Processing
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Solution Overview
Problem
Digital watermarks in images are often removed or degraded during extensive processing, making it difficult to trace the origin of distributed digital information.
Innovation Solution
A digital watermarking system that encodes watermark data into a bitmap template and composites it with the original image, ensuring the watermark remains detectable even after processing, using techniques like careful sizing, compositing, redundancy, and non-standard encoding to maintain image quality and resilience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital watermarking is applied to track distributed digital information, then the ability to identify violators is improved, but the watermark can be removed or degraded during extensive processing
Solution Approach 1:
The watermark is divided into multiple segments distributed across different regions of the image. Each segment contains part of the identifying information, and the complete watermark can be reconstructed by combining segments from multiple processed versions of the image, making it resilient to localized degradation.
Solution Approach 2:
The watermark is embedded into the image during the initial distribution phase, before any processing occurs. The embedding process is designed to anticipate future processing operations by using encoding methods that are robust to compression, filtering, and other common image manipulations.
2Adaptability or versatility
If extensive processing is applied to digital information after distribution, then the digital information can be adapted and distributed widely, but the watermark becomes removed or degraded
Solution Approach 1:
The watermark embedding uses parameter adjustments in the frequency domain or pixel value ranges that are less susceptible to common processing operations. By encoding the watermark in parameters that remain relatively stable during compression, filtering, or format conversion, the watermark integrity is preserved across various processing scenarios.
Solution Approach 2:
The system acknowledges that processing will occur and designs the watermark to potentially benefit from certain processing operations. For example, the watermark pattern is designed so that common compression algorithms actually enhance its detectability or make it more resistant to removal, converting the harmful effect of processing into a beneficial property.
3Loss of information
If watermark data is encoded into the image, then traceability is improved, but image quality may be compromised
Solution Approach 1:
The watermark is embedded with varying strength or visibility in different regions of the image based on local characteristics. In regions where image quality is most critical, the watermark embedding is minimized or adapted to preserve quality, while in other regions, stronger embedding ensures traceability. This local adaptation allows both traceability and quality to be optimized in their respective areas.
Data Source
AI summary
Embodiments of the invention provide a digital watermarking system and method for producing watermarked images from a sequence of original images. The system includes a storage unit and a processor to encode watermark data, create a watermark bitmap template of the encoded watermark data, load and scale the original images, composite the watermark bitmap template and the scaled original images to produce the watermarked images, and store the watermarked images. The system can also produce a single watermarked image from a single original image.