Watermark Detectability in 2D-3D Content Conversion
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Solution Overview
Problem
The conversion of 2D digital content to 3D often results in watermarks becoming shifted or undetectable, posing challenges for their preservation and detection in 3D content.
Innovation Solution
A novel watermark analysis system processes left and right eye images of 3D content to determine the anticipated location of watermarks based on disparity analysis, ensuring detectability and readability, and can also place watermarks in 2D or 3D content for improved visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If 2D content is converted to 3D content, then the entertainment value and visual appeal are improved, but the watermark detectability and location stability deteriorate
Solution Approach 1:
The system performs preliminary disparity analysis on the 3D content to predict where watermarks will appear before actually placing or detecting them. By calculating disparity values for different depth planes in advance, the system can anticipate watermark locations and ensure proper placement or detection at those predicted positions, resolving the contradiction between 3D conversion benefits and watermark detectability
Solution Approach 2:
The patent introduces disparity maps as an intermediary tool that bridges the 2D watermark placement and 3D content structure. The disparity map serves as a mediator that translates 2D watermark coordinates into predicted 3D locations by analyzing depth information, enabling accurate watermark detection in 3D content without compromising entertainment value
2Measurement precision
If watermarks are placed in 2D content, then they are easily detectable in 2D, but their location shifts and detectability is lost in 3D conversion
Solution Approach 1:
The system performs preliminary disparity analysis on the 3D content to predict where watermarks will appear before actually placing or detecting them. By calculating disparity values for different depth planes in advance, the system can anticipate watermark locations and ensure proper placement or detection at those predicted positions, resolving the contradiction between 3D conversion benefits and watermark detectability
Solution Approach 2:
The patent changes the coordinate system parameters from 2D image coordinates to 3D disparity-based coordinates. By transforming watermark location specifications from simple 2D coordinates to disparity-aware 3D coordinates, the system maintains watermark location stability through conversion, as the new parameter system inherently accounts for depth-induced position shifts
3Measurement precision
If disparity analysis is performed to predict watermark locations, then watermark detectability in 3D is improved, but system complexity increases
Solution Approach 1:
The disparity analysis module serves multiple functions: it predicts watermark locations, analyzes depth planes, and provides spatial transformation data. By making this single module multi-functional, the system achieves improved watermark detectability without proportionally increasing overall system complexity, as the same disparity data supports multiple processing objectives
Solution Approach 2:
The system uses the disparity information to automatically determine watermark locations without requiring manual annotation or complex detection algorithms. The disparity map self-services the watermark placement/detection process by providing the transformation rules needed to map 2D watermark positions to 3D locations, reducing the need for additional complex detection machinery
Data Source
AI summary
A system and method are provided for analyzing 3D digital content to determine whether a watermark is detectable. The watermark may exist in 2D content that is converted to 3D, and in such cases, the survivability of the watermark to the conversion process is evaluated. An anticipated location of the watermark in left and right 3D images may be determined, and the detectability based upon the anticipated location. A report may indicate whether the watermark survived the conversion in one or both images, or neither. The process may be performed for single frames, sequences of single frames, or entire files containing many image frames. Watermark placement may also be proposed for locations in 2D content, 3D content, or both. Watermarks may similarly be placed in the content.