Unlock instant, AI-driven research and patent intelligence for your innovation.

System for measuring the distance of an obstacle by optical flow

A technology of obstacles and optical flow, applied in the field of aircraft, can solve the problem that optical flow does not need to measure distance quantitatively

Active Publication Date: 2019-05-21
UNIV DE PROVENCE D AIX MARSEILLE I +1
View PDF13 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, optical flow is not usually used to quantitatively measure distance

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • System for measuring the distance of an obstacle by optical flow
  • System for measuring the distance of an obstacle by optical flow
  • System for measuring the distance of an obstacle by optical flow

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] Optical flow is inseparable from the presence of motion in the image observed by the sensor. The measurement is better if the speed is high and the target zone is far from the axis of travel. So far, measurements of optical flow in aircraft have been based on the only movement of the aircraft. However, certain types of aircraft, such as helicopters, may have slow or stationary flight, making it difficult to employ known techniques based on optical flow to detect obstacles near the blades, such as rock walls.

[0022] This paper proposes to make an optical flow sensor with constant movement relative to the vehicle effective in a configuration that provides usable optical flow even when the vehicle is stationary. More specifically, it is proposed to measure the optical flow while rotating along a circle, for example at the end of a helicopter's rotor blade.

[0023] In principle, rotations are not available in optical flow, since these introduce components that are inde...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a system for measuring the distance of an obstacle (14), wherein an optical flow is radially measured in rotation around a circle (12) in a plane intersecting the obstacle; and the distance of the obstacle is determined according to the amplitude of the optical flow, the radius of the circle, and the speed of rotation.

Description

technical field [0001] The invention relates to an obstacle detection system using optical flow technology, especially for aircraft. Background technique [0002] Optical flow techniques are often considered in collision avoidance systems for drones. For example, the article by Laurent Muratet et al., "A Contribution to Vision-Based Autonomous Helicopter Flight in Urban Environments" (Robotics and Autonomous Systems, Volume 50, Issue 4, Pages 195-209, March 31, 2005), and Simon Zingg et al. The article, "MAV Navigation Through IndoorCorridors Using Optical Flow" (ICRA 2010), proposes to guide drones between buildings by equalizing the optical flow of the sidebands of images captured by cameras oriented in the direction of displacement. Therefore, the optical flow of an image is used qualitatively or differentially without calculating absolute speed or distance. [0003] Figure 1A Images taken by the front camera during the movement of the drone between buildings according...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01B11/02B64C27/04G05D1/04
CPCG01B11/026G05D1/0231B64C27/006B64C27/04G01S13/93G05D1/00G01F1/3209G01P13/045G05D1/0858
Inventor S·M·V·维奥利特F·T·A·科洛尼耶E·范霍特
Owner UNIV DE PROVENCE D AIX MARSEILLE I