VR Image Pre-Distortion via Polar Coordinate Mapping
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Solution Overview
Problem
Virtual Reality (VR) systems face challenges in reducing geometric distortions introduced by Head-Mounted Displays (HMDs), particularly due to the use of convex lenses, which affect user experience and authenticity of content viewed.
Innovation Solution
Implementing a method and apparatus for VR devices that utilize a polar coordinate system to establish a correspondence between input and output image data, performing pre-distortion processing to suppress non-uniform distortions caused by convex lenses, and presenting image data based on a convex lens, thereby reducing geometric distortions and improving adaptability across various devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If convex lenses are used in HMD to present image data, then the VR system can achieve a realistic near-field display experience, but geometric distortions are introduced that degrade image quality and user experience
Solution Approach 1:
The patent applies pre-distortion processing to the image data before it is presented through the convex lenses. By intentionally distorting the image in advance using a distortion processing module, the distortion compensates for the lens-induced geometric distortions, thereby eliminating the need for post-processing correction and improving manufacturing precision of the display system
Solution Approach 2:
The patent transforms image data from a Cartesian coordinate system to a polar coordinate system to adapt the image parameters to the optical characteristics of the convex lenses. This parameter transformation enables the image to be properly mapped through the lens system, reducing geometric distortions while maintaining display brightness
2Manufacturing precision
If traditional distortion correction methods are used, then some geometric distortions can be reduced, but the correction is highly dependent on specific device models and resolutions, reducing system adaptability
Solution Approach 1:
The patent develops a universal distortion correction algorithm based on polar coordinate transformation that can be applied across different HMD device models and resolutions. The distortion processing module uses a standardized approach that adapts to various devices without requiring model-specific customization, thereby improving both correction accuracy and device compatibility
Solution Approach 2:
The patent transitions from correcting distortions in the traditional Cartesian coordinate space to using polar coordinate space, adding a new dimensional framework for distortion correction. This dimensional change enables a more fundamental and universally applicable correction method that works across different device configurations
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 geometric distortions, enhances the authenticity of content, and improves the flexibility of distortion correction, making it less dependent on resolution and device models, thus improving the overall VR experience.
Implementation Method 1
presenting the image data to be presented on the basis of a convex lens
Data Source
AI summary
Provided are a method and apparatus for presenting image for a VR device, a device and a non-transitory computer-readable storage medium. The method for presenting image for a VR device includes steps of: acquiring input image data; establishing a correspondence between the input image data and output image data in a polar coordinate system, the polar coordinate system having a pole which is an intersection of a center of a field of view of the VR device and a display plane; obtaining image data to be presented according to the output image data; and presenting the image data to be presented on the basis of a convex lens.