HMD Viewpoint Fidelity Measurement for Tracking Error Detection
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Solution Overview
Problem
Determining the accuracy of viewpoint fidelity in head-mounted displays (HMDs) for flight simulation remains challenging, as existing methods struggle to objectively measure and test HMD errors, which can lead to inaccuracies in virtual viewpoint depiction.
Innovation Solution
A method is provided to measure viewpoint fidelity by generating a virtual environment with adjustable shapes, recording reference data, and calculating positional and orientation displacement vectors to determine HMD tracking errors, with thresholds for success or failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If head mounted display tracking technology is used to provide realistic output, then immersion and realism are improved, but measurement of viewpoint fidelity accuracy becomes difficult
Solution Approach 1:
The patent introduces a test stand as an intermediary device between the HMD and the virtual environment. The test stand provides known, precise positional references that mediate the measurement process, allowing accurate determination of viewpoint fidelity errors without directly measuring the complex HMD-virtual environment interaction.
Solution Approach 2:
The patent creates a virtual copy of the test stand and its references within the HMD's field of view. By comparing the actual test stand position with its virtual representation, the system can measure tracking errors through the displacement between these two references, effectively copying the measurement reference into the virtual space.
2Measurement precision
If virtual environment elements are made adjustable to test tracking, then measurement capability is improved, but system complexity increases
Solution Approach 1:
The patent segments the measurement system into distinct components: a physical test stand with references, a virtual representation of the test stand, and a comparison mechanism. This segmentation allows each component to be independently optimized and controlled, reducing overall system complexity while maintaining measurement precision.
Solution Approach 2:
The test stand serves multiple functions: it provides physical positional references for the HMD, creates a virtual representation for comparison, and enables measurement of tracking errors. This multi-functionality reduces the need for separate dedicated measurement devices, simplifying the overall system while improving measurement capabilities.
Data Source
AI summary
Example methods, apparatuses, and computer-readable media are provided. Example methods include generating a virtual environment including a first shape and a second shape in a virtual viewpoint, the first shape in front of the second shape. The second shape adjusts as the virtual viewpoint adjusts, and is offset from the first shape along a test axis. The first shape is affixed to the virtual viewpoint. The virtual viewpoint is configured to adjust in response to movement of a HMD. The method includes moving a position of the virtual viewpoint with respect to the second shape in response to the movement. The method includes recording reference data associated with moving of the position of the virtual viewpoint. The method includes generating a positional displacement vector by comparing reference data of the second shape with reference data of the first shape, and determining a HMD movement tracking error based on the vector.