Event-Driven Vision Sensor 3D Position Detection
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Solution Overview
Problem
Existing event-driven type vision sensors lack effective techniques to accurately and efficiently detect the position of objects in a space, differing from conventional frame type sensors.
Innovation Solution
An event-driven type vision sensor system that outputs event signals indicating two-dimensional positions of light intensity changes, combined with a light source emitting directional light, allows for the detection of three-dimensional positions using the angle of light emission and positional relations between the sensor and light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an event-driven type vision sensor is used to detect object positions, then detection speed and power efficiency are improved, but the ability to accurately determine three-dimensional position from two-dimensional event signals deteriorates
Solution Approach 1:
The patent introduces a light source as an intermediary element that emits directional light toward the space being monitored. This light source works in conjunction with the event-driven vision sensor to provide additional information about the three-dimensional position of objects. The light source acts as a mediator that bridges the gap between the two-dimensional sensor data and the required three-dimensional position information, enabling accurate spatial localization while maintaining the high-speed advantages of event-driven sensing.
2Measurement precision
If conventional frame type vision sensors are used, then three-dimensional position information can be obtained, but detection speed and power consumption deteriorate
Solution Approach 1:
The patent segments the vision sensing function into two distinct components: an event-driven vision sensor that operates asynchronously to detect light intensity changes at high speed, and a light source that provides directional information. This segmentation allows each component to operate in its optimal mode - the sensor maintains high-speed event-driven operation while the light source supplements the positional information, thereby achieving both speed and accuracy without the power consumption penalties of conventional frame-based sensors.
3Use of energy by moving object
If event-driven type vision sensors are used without additional light source information, then power consumption is reduced, but the completeness of position detection information deteriorates
Solution Approach 1:
The patent merges the event-driven vision sensor system with a directional light source to create a hybrid detection system. The light source emits light in specific directions and the sensor detects events where light intensity changes occur. By combining these two elements, the system recovers the three-dimensional positional information that would otherwise be lost in pure event-driven sensing, while maintaining lower power consumption compared to conventional frame-based approaches since only specific pixels activate events rather than scanning the entire sensor array.
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
Enables high-speed and accurate detection of object positions in a space by leveraging the asynchronous nature of event-driven sensors and directional light sources, improving upon the limitations of conventional vision sensors.
Implementation Method 1
an event-driven type vision sensor that outputs an event signal indicating a two-dimensional position which is located within a field of view of the vision sensor and at which a light intensity change has occurred
Implementation Method 2
a light source that emits light having directivity toward the space
Data Source
AI summary
A system includes an event-driven type vision sensor that outputs an event signal indicating a two-dimensional position which is located within a field of view of the vision sensor and at which a light intensity change has occurred in a space, and a time of day at which the light intensity change has occurred, a light source that emits light having directivity toward the space, and a position detecting device including an event signal receiving section that receives the event signal, and a position detecting section that detects a three-dimensional position of the light intensity change on the basis of an angle at which the light source has emitted the light at the time of day, the two-dimensional position, and a positional relation between the vision sensor and the light source.