Adaptive Image Sequence Watermarking for Authentication

The patent applies dynamics by making the watermarking approach adaptive based on image content. The system dynamically adjusts between fragile watermarking (for static regions) and robust watermarking (for dynamic regions) based on motion detection and region importance analysis. This allows the watermarking strategy to change according to the specific characteristics of each image region and sequence position, resolving the contradiction between robustness and sensitivity.

The patent changes parameters of the watermarking system based on image characteristics. It modifies watermark strength, embedding method, and detection thresholds according to motion magnitude, region importance, and sequence position. By adjusting these parameters dynamically, the system achieves both compression robustness and modification sensitivity where needed.

The system dynamically selects between fragile and robust watermarking modes based on real-time analysis of image characteristics, motion patterns, and sequence context. This dynamic adaptation allows fragile watermarking to be applied only where and when modification detection is critical, while robust watermarking handles compression-prone regions.

The patent applies different watermarking qualities to different regions of the image sequence. Important static regions receive fragile watermarking for high sensitivity, while dynamic or less critical regions use robust watermarking for compression tolerance. This local differentiation resolves the contradiction by applying the appropriate level of fragility/robustness to each specific context.

The patent applies partial action by selectively watermarking only certain images in the sequence rather than every image. It uses motion detection and change analysis to identify which frames require watermarking, applying the technique only when necessary for authentication coverage. This reduces overall processing time while maintaining sufficient authentication capability.

The system segments the image sequence into groups based on motion and change characteristics, applying watermarking at strategic points rather than uniformly across all frames. This segmentation approach maintains authentication coverage by placing watermarks at key decision points while reducing total computational burden.

The patent extracts only the essential and relevant features from difference images for inclusion in the watermark message. It identifies and extracts key motion vectors, significant region changes, and critical frame identifiers, omitting redundant or less important details. This extraction process maintains detection precision while significantly reducing message length and processing complexity.

The system includes only the necessary portion of difference image information in the watermark message, rather than embedding complete or excessive detail. It selectively incorporates minimal sufficient data required for authentication and modification detection, reducing message complexity while maintaining adequate detection precision.