Stereo Vision Measurement Using Spatially Filtered 3D Stimuli
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Solution Overview
Problem
Current stereo vision tests are limited in their ability to accurately measure stereoacuity over a wide range of disparities, particularly for patients with low visual acuity or impaired stereo vision, and lack error measurement, leading to inaccurate assessments and reduced utility in clinical trials.
Innovation Solution
A system and method using spatially filtered dot elements, such as log-Gabor or Difference of Gaussians dots, to generate a three-dimensional visual stimulus that isolates stereo function, allowing precise measurement of stereo performance with error measurement through sub-pixel interpolation and minimizing non-stereo cues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional stereo vision tests use sharp-edged stimuli with fine detail, then measurement precision is improved for patients with normal visual acuity, but patients with low visual acuity cannot perceive the fine detail and perceive them as blurry, resulting in loss of information and inaccurate measurement
Solution Approach 1:
The patent applies local quality by using spatially filtered dot elements with specific frequency characteristics that are locally optimized for both high and low visual acuity conditions. The stimuli use bandpass-filtered dots with controlled spatial frequencies that ensure perceivability across different acuity levels while maintaining stereo measurement precision.
Solution Approach 2:
The patent changes the parameter of spatial frequency distribution in the stimuli by using spatially filtered dot elements instead of sharp-edged stimuli. This parameter change allows the stimuli to be effectively perceived by patients with low visual acuity while still providing accurate stereoacuity measurement across a wide range of disparities.
2Reliability
If disparity is introduced into the stimulus by moving features in different directions for the two eyes, then stereo function is activated, but non-stereo cues are introduced through changes in local arrangement or density of features that allow stereo-blind patients to achieve acceptable performance
Solution Approach 1:
The patent extracts only the essential stereo-carrying information by using spatially filtered dot elements that minimize non-stereo cues. The spatial filtering removes high-frequency components that could provide non-stereo arrangement cues, leaving only the disparity information necessary for stereo vision assessment.
Solution Approach 2:
The patent changes the spatial frequency parameters of the stimulus elements to reduce non-stereo cues. By using bandpass-filtered dot elements with specific frequency characteristics, the stimuli provide disparity information while minimizing changes in local arrangement or density that could serve as non-stereo cues.
3Measurement precision
If traditional tests present a limited set of predetermined disparities, then device complexity is reduced, but measurement precision is limited and patients with stereo vision abilities between predetermined levels cannot be accurately measured
Solution Approach 1:
The patent applies dynamics by enabling continuous adjustment of disparity parameters in the visual stimulus. The system can dynamically present stimuli at any disparity value within a wide range, rather than being restricted to predetermined discrete levels, thereby improving measurement precision without requiring complex hardware changes.
Solution Approach 2:
The patent enables continuous variation of the disparity parameter in the stimulus presentation. This parameter change allows for precise measurement of stereoacuity across a continuous range of disparities, accommodating patients with varying stereo vision abilities while maintaining manageable system complexity through software-based control.
4Measurement precision
If sub-pixel interpolation is used to achieve precise disparity presentation, then measurement precision is improved, but device complexity increases due to the need for sophisticated stimulus generation and processing
Solution Approach 1:
The patent replaces complex mechanical or hardware-based precision positioning systems with software-based sub-pixel interpolation techniques. This substitution allows for precise disparity presentation through computational methods rather than physical adjustments, reducing hardware complexity while maintaining or improving measurement precision.
Data Source
AI summary
A system and method for stereo vision measurement are provided. A three-dimensional visual stimulus is generated. The visual stimulus is composed of a plurality of spatially filtered dot elements configured to isolate stereo function. The visual stimulus is then presented to a user via a display device and input data is received in response to the user viewing the visual stimulus as presented. A stereo performance of the user is then determined from the input data.