Input Marker Layout for Accurate VR Pose Tracking
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Solution Overview
Problem
Existing systems face challenges in accurately identifying the positions of markers in images for precise tracking of devices, leading to inaccuracies in estimating the position and posture of input devices in virtual reality environments.
Innovation Solution
The device incorporates a specific arrangement of markers on the input device, ensuring an angle difference between the normal directions of markers is within a predetermined threshold and maintaining a minimum distance between them, facilitating accurate identification and separation of marker images in captured images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If markers are arranged close together to reduce device complexity, then the number of markers can be reduced, but the images of multiple markers may be erroneously recognized as a single image, degrading tracking precision
Solution Approach 1:
The patent applies local quality by differentiating the arrangement requirements of markers based on their spatial relationships. Specifically, when the angle difference between normal directions of two markers is less than a predetermined threshold value, the distance between the markers is set to be greater than or equal to a predetermined distance. This localized constraint ensures that markers with similar orientations are sufficiently separated to avoid image merging, while allowing flexible arrangement elsewhere to minimize overall marker count.
2Measurement precision
If markers are arranged with large angle differences between normal directions, then marker images can be easily distinguished, but the device complexity increases due to stricter arrangement constraints
Solution Approach 1:
The patent applies parameter changes by establishing a threshold-based classification system for angle differences between marker normal directions. When the angle difference is below the threshold, a minimum distance constraint is applied; when above the threshold, no such constraint is needed. This parameter-based approach simplifies the overall arrangement rules while ensuring accurate marker image distinction, avoiding the need for uniformly large angle differences across all marker pairs.
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 arrangement enhances the accuracy of tracking by preventing marker images from being erroneously recognized as a single image, thereby improving the estimation of the input device's position and posture, thus enhancing user immersion in virtual reality applications.
Implementation Method 1
a plurality of markers configured to emit light to the outside of the case body
Data Source
AI summary
An input device includes a case body and a plurality of markers 30d, 30e, and 30p configured to emit light to the outside of the case body. When an angle difference between the normal directions of the two markers 30d and 30e is less than a predetermined threshold value, a distance between the two markers 30d and 30e is equal to or greater than a predetermined first distance. When an angle difference between the normal directions of the two markers 30d and 30p is equal to or greater than a predetermined threshold value, a distance between the two markers 30d and 30p is equal to or greater than a predetermined second distance, and the second distance is shorter than the first distance.