Optical vortex position detection with a Shack-Hartmann wavefront sensor using extended closed contour method

2015 ◽  
Author(s):  
Hongxin Huang ◽  
Jia Luo ◽  
Yoshinori Matsui ◽  
Haruyoshi Toyoda ◽  
Takashi Inoue
Keyword(s):  
Optical Vortex ◽  
Contour Method ◽  
Wavefront Sensor ◽  
Closed Contour ◽  
Position Detection

scholarly journals Correlation matching method for high-precision position detection of optical vortex using Shack–Hartmann wavefront sensor

2012 ◽  
Vol 20 (24) ◽  
pp. 26099 ◽  
Author(s):  
Chenxi Huang ◽  
Hongxin Huang ◽  
Haruyoshi Toyoda ◽  
Takashi Inoue ◽  
Huafeng Liu
Keyword(s):  
High Precision ◽  
Optical Vortex ◽  
Wavefront Sensor ◽  
Matching Method ◽  
Position Detection ◽  
Correlation Matching

Adaptive position detection of optical vortex using a Shack-Hartmann wavefront sensor

2015 ◽  
Author(s):  
Jia Luo ◽  
Hongxin Huang ◽  
Yoshinori Matsui ◽  
Haruyoshi Toyoda ◽  
Takashi Inoue ◽  
...  
Keyword(s):  
Optical Vortex ◽  
Wavefront Sensor ◽  
Position Detection

scholarly journals High-order optical vortex position detection using a Shack-Hartmann wavefront sensor

2015 ◽  
Vol 23 (7) ◽  
pp. 8706 ◽  
Author(s):  
Jia Luo ◽  
Hongxin Huang ◽  
Yoshinori Matsui ◽  
Haruyoshi Toyoda ◽  
Takashi Inoue ◽  
...  
Keyword(s):  
Optical Vortex ◽  
High Order ◽  
Wavefront Sensor ◽  
Position Detection

scholarly journals Eight-connected contour method for accurate position detection of optical vortices using Shack–Hartmann wavefront sensor

2015 ◽  
Vol 54 (11) ◽  
pp. 111302 ◽  
Author(s):  
Hongxin Huang ◽  
Jia Luo ◽  
Yoshinori Matsui ◽  
Haruyoshi Toyoda ◽  
Takashi Inoue
Keyword(s):  
Contour Method ◽  
Wavefront Sensor ◽  
Optical Vortices ◽  
Position Detection ◽  
Accurate Position

scholarly journals CONTOUR METHOD FOR POSITIONING OBJECTS IN MOBILE COMPUTER VISION SYSTEMS

2021 ◽  
pp. 62-69
Author(s):  
Sergey Kondratyev ◽  
Vitaliy Kostenko ◽  
Marina Yadrova
Keyword(s):  
Computer Vision ◽  
Control Unit ◽  
Contour Method ◽  
Raspberry Pi ◽  
Closed Contour ◽  
Vision Systems ◽  
Mobile Computer ◽  
Video Cameras ◽  
Computer Vision Systems

The paper considers the possibility of solving the problem of improving the quality of technical vision using the contour method, which is used to position objects in mobile computer vision systems. The hardware part of the object positioning system includes two video cameras, a Raspberry Pi 3 microcomputer, a depth contour map screen, and a motor control unit. The codes of programs based on the OpenCV library, the algorithm of the system and examples of the implementation of the contour method are given. The algorithm of the developed positioning technique includes the selection of the contours of objects on the frames of a stereopair, removal of all open contours, calculation of the moment (center of mass) of each closed contour, determination of the displacement along the x-axis of the moments of the corresponding contours, filling each closed contour with points with a brightness inversely proportional to the displacement of the moments. The presence of two video cameras, a Raspberry Pi 3 microcomputer, a contour depth map screen provides stereoscopic and panoramic "vision", that is, the ability to determine the presence of objects and their distance, as well as to get an overall picture in the "field of view" of the system. The engine control unit allows mobile devices to avoid obstacles. Based on the analysis of the research results, it was found that the proposed system provides an increase in the quality of positioning of objects and a decrease in the required computing resource, which gives a significant decrease in power consumption and ensures the autonomy of the system.

scholarly journals Aberration-resistible topological charge determination of annular-shaped optical vortex beams using Shack–Hartmann wavefront sensor

2019 ◽  
Vol 27 (5) ◽  
pp. 7803 ◽  
Author(s):  
Daiyin Wang ◽  
Hongxin Huang ◽  
Yoshinori Matsui ◽  
Hiroshi Tanaka ◽  
Haruyoshi Toyoda ◽  
...  
Keyword(s):  
Topological Charge ◽  
Optical Vortex ◽  
Wavefront Sensor ◽  
Vortex Beams ◽  
Charge Determination
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