Multi-dimensional Image Stacking with Self-Correction
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Solution Overview
Problem
Current stacked projection systems face challenges in achieving accurate registration and brightness uniformity due to system imperfections, calibration errors, and environmental factors, which degrade image quality and make it difficult to migrate to higher resolutions like 4K without significant improvements.
Innovation Solution
A multi-dimensional image stacking method that includes spatial and temporal stacking in 2D and 3D domains, combined with a self-correction feature, where input images are modified into sub-regions and sub-frames to maintain high frequency band information balance across projectors, and sensor-based feedback processes for continuous calibration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional warping-based registration is used to align stacked projector images, then registration can be achieved, but image quality degrades due to pixel blurring and loss of high frequency information
Solution Approach 1:
The image is divided into multiple frequency bands (low frequency and high frequency components). Low frequency components are processed through warping for registration, while high frequency components are preserved separately and combined later, avoiding the blurring effect on critical image details
Solution Approach 2:
Different processing strategies are applied to different frequency components of the image. Low frequency regions undergo geometric transformation and warping, while high frequency regions maintain their original quality, creating local quality optimization throughout the image
2Measurement precision
If calibration is performed using traditional camera-based methods, then initial registration can be established, but system errors, thermal drifting, and vibrations cause continuous registration degradation over time
Solution Approach 1:
A feedback mechanism is implemented where the system continuously monitors the stacked projection output and automatically adjusts registration parameters in real-time to compensate for thermal drifting, vibrations, and component aging, maintaining accurate alignment without requiring periodic manual recalibration
Solution Approach 2:
The system performs self-calibration and self-correction of registration errors autonomously during operation, eliminating the need for external calibration equipment and manual intervention, and continuously adapting to environmental changes and component degradation
3Illumination intensity
If multiple projectors are stacked to increase brightness, then projection brightness increases, but registration accuracy and brightness uniformity become difficult to maintain due to system imperfections and environmental factors
Solution Approach 1:
The system dynamically adjusts registration and brightness parameters in real-time based on environmental conditions and component performance, allowing the stacked projection system to maintain uniform brightness and accurate alignment despite variations in projector output and environmental factors
Data Source
AI summary
A method and apparatus comprises a combination of four-dimensional image stacking methods and self-correction features. An input frame in a sequence is modified into multiple subimages with multiple subregions, where there is one and only one subregion in every subimage contains the higher frequency information of the original input frame than the same subregion in all other subimages; each of the subimages is sent to a device of a stacked display system; the sequence of displayed frames is further modified into pairs for temporal stacking. The result is equal or considered better than the original quality. By equipped with sensor based negative feedback processes and correction algorithms, it provides new ways to fast calibration or constantly and continuously self-correction to the display system non-uniformities, including brightness, registration, etc., and all behind the scene during the normal show playing or image presentation therefore unnoticeable to audience.