Scanning ToF Sensor for Visually Impaired Obstacle Detection
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Solution Overview
Problem
Visually-impaired individuals face limitations in understanding their terrain and obstacles while walking due to the limited capabilities of traditional walking canes, which do not provide comprehensive multi-axis obstacle detection.
Innovation Solution
A multi-axis obstacle sensing system incorporating a scanning Time of Flight (ToF) sensor, a processor, and a global navigation satellite system (GNSS) module, which creates a matrix of distance measurements to identify obstacles and outputs directional and distance information through synthesized speech or a touch-based interface, and can transmit data to a cloud-based database for shared obstacle alerts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional walking cane is used for obstacle detection, then the device is simple and easy to operate, but the measurement precision and comprehensive understanding of terrain is limited
Solution Approach 1:
The patent replaces the traditional mechanical walking cane with an optical sensing system using Time of Flight (ToF) sensors to detect obstacles. The mechanical probing method is substituted with optical measurement, enabling non-contact, multi-axis detection of obstacles and terrain features, thereby significantly improving measurement precision while maintaining operational simplicity through automated processing
Solution Approach 2:
The patent transitions from single-point mechanical detection to multi-dimensional optical scanning. By using a scanning ToF sensor that measures distance in multiple directions (creating an m by n matrix of distance indications), the system adds spatial dimensions to obstacle detection, providing comprehensive 3D terrain understanding rather than limited linear probing
2Area of stationary object
If a scanning ToF sensor creates an m by n matrix of distance measurements, then the obstacle detection coverage is improved, but the processing complexity increases
Solution Approach 1:
The patent divides the detection space into an m by n matrix of discrete distance measurements, where each element represents a specific directional sector. This segmentation allows the system to process and interpret terrain information in manageable units, identifying obstacles by analyzing differences between adjacent matrix elements rather than processing the entire 3D space at once
Solution Approach 2:
The processor automatically analyzes the distance matrix to identify obstacles and terrain features without requiring manual interpretation. The system self-processes the raw distance data, compares it against threshold criteria, and generates obstacle indications with directional and distance information, eliminating the need for external processing intervention
3Loss of information
If multi-axis obstacle sensing is implemented, then the information completeness is improved, but the energy consumption increases
Solution Approach 1:
The scanning ToF sensor operates periodically, measuring distance in multiple directions at discrete time intervals rather than continuously. This periodic scanning approach captures sufficient terrain information for obstacle detection while significantly reducing energy consumption compared to continuous omnidirectional sensing, balancing information completeness with power usage
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
Enhances the visually-impaired pedestrian's ability to navigate by providing detailed, real-time obstacle information, improving safety and awareness of the environment, and can also alert other users and devices, such as snowplows, to hidden obstacles.
Implementation Method 1
a scanning time of flight (ToF) sensor component that determines a distance from the scanning ToF sensor component to a nearest object for an m by n direction matrix
Data Source
AI summary
Various arrangements for avoiding obstacles for a visually-impaired pedestrian are presented. An m by n matrix of distance measurements may be created using a scanning time of flight (ToF) sensor component for various different directions. The m by n matrix of distance measurements and the m by n direction matrix may be analyzed to identify a first obstacle having a vertical height that differs by at least a predefined threshold measurement from a neighboring second region. Based on identifying the first obstacle, an indication of the first obstacle and an indication of the distance to the first obstacle determined using the m by n matrix of distance indications may be output.