Correction Grid for VR Display Distortion
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Solution Overview
Problem
Virtual reality display devices experience image distortion due to the use of lenses, which affects the viewing angle and immersion quality, especially when the visual fields of both eyes overlap, leading to edge image distortion and reduced viewing experience.
Innovation Solution
A method and device for correcting image distortion by forming a correction grid on the imaging screen with adjustable grid points, establishing a two-dimensional coordinate system, and moving grid points outside a circle to align grid lines, thereby correcting barrel and pillow distortions caused by lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a lens is used in a virtual reality display device to expand the field of view, then the viewing angle is improved, but image distortion occurs especially at the edges
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-storing distortion correction parameters for different regions (center and edge) of the display screen before actual image rendering. The system divides the screen into multiple regions and pre-determines the appropriate correction parameters for each region, so that when images are displayed, the distortion correction is already prepared and can be applied immediately without real-time calculation delays.
Solution Approach 2:
The patent implements local quality by applying different distortion correction strategies to different regions of the display screen. Specifically, the system identifies whether a grid point is located in the center or edge region of the screen and applies corresponding correction parameters: linear interpolation for center regions and inverse square interpolation for edge regions. This localized approach allows optimal correction for each specific area rather than using a uniform correction method across the entire screen.
2Adaptability or versatility
If the field of view is expanded to improve immersion, then the viewing experience is enhanced, but edge image distortion increases
Solution Approach 1:
The patent applies local quality by implementing region-specific distortion correction. The system divides the display screen into center and edge regions, and applies different interpolation methods to each: linear interpolation for center regions and inverse square interpolation for edge regions. This localized correction strategy specifically addresses the severe distortion at edges while maintaining the expanded field of view for immersion.
Solution Approach 2:
The patent utilizes parameter changes by dynamically selecting different correction parameters based on the spatial location of grid points. The system changes the correction parameter type (linear vs. inverse square) depending on whether the grid point is in the center or edge region. This parameter adaptation allows the system to maintain high immersion quality with expanded field of view while effectively compensating for edge distortion through appropriate parameter selection.
3Manufacturing precision
If a correction grid with multiple adjustable grid points is used, then image distortion is corrected, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the display screen into multiple regions (center and edge) and further segmenting the correction process into discrete steps. The system segments the screen based on grid point locations and applies different correction algorithms to each segment. This segmentation approach simplifies the overall complex distortion correction problem into manageable, region-specific sub-problems that can be solved more easily.
Solution Approach 2:
The patent implements preliminary action by pre-calculating and pre-storing distortion correction parameters for all possible grid point locations before actual image rendering. The system pre-determines the correction parameters for center and edge regions and stores them in lookup tables, so that during real-time display, the system only needs to retrieve the appropriate pre-computed parameters rather than performing complex real-time calculations. This significantly reduces computational complexity while maintaining high correction accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves user immersion by aligning grid lines and reducing distortion, enhancing the viewing experience by maintaining image clarity across the entire field of view without the need for expensive spherical displays.
Implementation Method 1
imaging the initial grid through a lens arranged at a side of the display screen, to form the correction grid on the imaging screen
Data Source
AI summary
A method and a device of correcting image distortion, a display device, a computer readable medium and an electronic device. The method of correcting image distortion includes: forming a correction grid on an imaging screen of a display device, the correction grid including a plurality of to-be-adjusted grid points; forming a circle on the correction grid; and moving the to-be-adjusted grid point on and outside the circle, to correct image distortion.