Ghost Compensation for Stereo Projection Crosstalk
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Solution Overview
Problem
Stereoscopic projection systems suffer from significant crosstalk or 'ghosting' due to imperfect polarization modulation, timing mismatches, and environmental factors, which degrade the quality of three-dimensional image perception.
Innovation Solution
A method and system that employ empirical calibration to characterize installation-specific crosstalk, using 'ghosting coefficients' to compensate for leakage between left and right eye images, applied in a segmented or zone-based manner to reduce crosstalk across the projection screen, suitable for both linear and circular polarization implementations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If temporal switching or polarization is used for image selection, then stereoscopic image display is achieved, but crosstalk or ghosting occurs between left and right eye images
Solution Approach 1:
The patent measures the actual crosstalk occurring in the projection system and uses this harmful leakage information to calculate compensation values. By treating the measured crosstalk as useful data about the system's characteristics, the invention converts the harmful effect into a basis for correction, applying the measured leakage to compensate for and eliminate crosstalk in subsequent image projections.
Solution Approach 2:
The patent implements a feedback mechanism where the actual crosstalk is measured from projected images, the measured crosstalk values are stored as compensation data, and this feedback information is used to adjust and compensate for crosstalk in future projections. This closed-loop approach continuously refines the compensation based on actual system performance.
2Device complexity
If uniform ghosting compensation is applied across the entire screen, then processing simplicity is maintained, but compensation accuracy deteriorates due to varying crosstalk characteristics across different screen regions
Solution Approach 1:
The patent divides the projection screen into multiple zones or regions, with each zone having its own measured crosstalk characteristics and compensation values. This segmentation allows different screen areas to be compensated independently according to their specific crosstalk profiles, improving overall compensation accuracy while maintaining manageable processing complexity through structured organization of compensation data.
Solution Approach 2:
The patent applies different compensation characteristics to different regions of the screen based on locally measured crosstalk values. Each zone receives customized compensation parameters tailored to its specific optical and environmental characteristics, rather than applying a uniform compensation approach, thereby optimizing compensation accuracy for each local area.
Data Source
AI summary
A method and system for reducing visual ghost artifacts in plano-stereoscopic image transmissions is provided. Such visual ghost artifacts are reduced by retrieving a non-linear image representation comprising left and right image representations using an image processor, where each of the left and right image representations have a plurality of color component sub-images. The non-linear left and right image representations are transformed into respective linear left and right image representations. A left or right image compensation signal is generated by applying the determined at least one ghosting coefficient to its associated one of the plurality of color component sub-images. A respective compensated right or left image is generated by subtracting the left or right image compensation signal from the uncompensated linear left or right image representation.