Dynamic Lens Distortion Correction for VR Chromatic Aberration
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Solution Overview
Problem
Existing VR devices suffer from chromatic aberration due to the refractive index variation of light wavelengths passing through lenses, leading to distortion mainly in the outer parts of images, which is not adequately corrected by simple distortion correction methods using fixed lens distortion parameters.
Innovation Solution
A compensation algorithm that calculates a distortion correction weight based on the distance between a current pixel and the center point of a lens distortion parameter, allowing for dynamic adjustment of distortion correction without relying on fixed lens distortion parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed lens distortion parameter is used for chromatic aberration correction, then the correction process is simple, but the correction accuracy in the outer area of the image deteriorates
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a fixed lens distortion parameter to a dynamic distortion correction weight that varies with pixel distance from the center. The distortion correction weight is calculated based on the distance between the center point and each pixel position, allowing the correction strength to adapt dynamically across different regions of the image. This resolves the contradiction by maintaining simple processing (through a clear distance-based formula) while achieving high correction accuracy in both center and outer areas.
Solution Approach 2:
The patent implements local quality by applying different distortion correction weights to different regions of the image based on their distance from the center. The distortion correction weight increases with distance from the center, providing stronger correction for outer areas that suffer from chromatic aberration while maintaining appropriate correction for central areas. This localized approach ensures optimal correction accuracy across the entire image without requiring complex multi-parameter systems.
2Measurement precision
If the distortion correction weight increases with distance from center, then chromatic aberration in outer areas is corrected, but the calculation complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the image into regions based on distance from the center point. Each pixel is assigned a distortion correction weight according to its distance category, with weights increasing for pixels farther from the center. This segmentation approach simplifies the calculation by using distance-based categorization rather than complex per-pixel analysis, achieving effective chromatic aberration correction while maintaining computational efficiency.
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
This approach effectively reduces chromatic aberration across the entire image, particularly in the outer areas, by dynamically adjusting the distortion correction weight with increasing distance from the center point, resulting in a more accurate and complete correction of image distortions.
Implementation Method 1
chromatic aberration refers to a phenomenon in which light passing through a lens forms an image in a different place for each color because the refractive index of light varies depending on a wavelength
Data Source
AI summary
Disclosed is a method of controlling a display device displaying an image using a lens, the method including storing a lens distortion parameter for chromatic aberration correction, receiving image data, primarily calculating a distance between a center point and a current pixel, secondarily calculating a distortion correction weight in consideration of the distance, and outputting image data of the current pixel through calculation according to the calculated distortion correction weight without using the stored lens distortion parameter intactly.