Single 3D laser projector with speckle suppression

2013 ◽  
Vol 11 (s2) ◽  
pp. S21102-321106 ◽  
Author(s):  
Lei Dong Lei Dong ◽  
Anting Wang Anting Wang ◽  
Fugui Yang Fugui Yang ◽  
Shulu Wang Shulu Wang ◽  
Lixin Xu Lixin Xu ◽  
...  
Keyword(s):  
Laser Projector ◽  
Speckle Suppression

Theory of speckle suppression in a laser projector based on a long multimode fiber

2021 ◽  
Vol 144 ◽  
pp. 107416
Author(s):  
A.S. Lapchuk ◽  
Qiyong Xu ◽  
Zichun Le ◽  
Jun Zhou ◽  
Zongshen Liu ◽  
...  
Keyword(s):  
Multimode Fiber ◽  
Laser Projector ◽  
Speckle Suppression

scholarly journals Dynamic Speckle Illumination Digital Holographic Microscopy by Doubly Scattered System

Photonics ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 276
Author(s):  
Yun Liu ◽  
Peihua Bu ◽  
Mingxing Jiao ◽  
Junhong Xing ◽  
Ke Kou ◽  
...  
Keyword(s):  
Time Correlation ◽  
Digital Holographic Microscopy ◽  
Laser Source ◽  
Speckle Reduction ◽  
Single Shot ◽  
Coherent Noise ◽  
Real Time Measurement ◽  
Dynamic Speckle ◽  
Holographic Microscopy ◽  
Speckle Suppression

The coherent noise always exists in digital holographic microscopy due to the laser source, degrading the image quality. A method of speckle suppression using the dynamic speckle illumination, produced by double-moving diffusers, is presented in digital holographic microscopy. The space–time correlation functions are theoretically analyzed from the statistics distribution in the doubly and singly scattered system, respectively. The configuration of double-moving diffusers is demonstrated to have better performance in speckle suppression compared with the single diffuser and moving-static double diffusers cases. The experiment results verify the feasibility of the approach. The presented approach only requires a single shot interferogram to realize the speckle reduction, accordingly it has the potential application in real-time measurement.

scholarly journals A 200Hz Compact Range Image Sensor Using a Multi-Spot Laser Projector

2008 ◽  
Vol 74 (739) ◽  
pp. 499-505 ◽  
Author(s):  
Masateru TATEISHI ◽  
Hidetoshi ISHIYAMA ◽  
Kazunori UMEDA
Keyword(s):  
Image Sensor ◽  
Range Image ◽  
Compact Range ◽  
Laser Projector

scholarly journals Three-dimensional speckle suppression in optical coherence tomography based on the curvelet transform

2010 ◽  
Vol 18 (2) ◽  
pp. 1024 ◽  
Author(s):  
Zhongping Jian ◽  
Lingfeng Yu ◽  
Bin Rao ◽  
Bruce J. Tromberg ◽  
Zhongping Chen
Keyword(s):  
Optical Coherence Tomography ◽  
Three Dimensional ◽  
Curvelet Transform ◽  
Optical Coherence ◽  
Speckle Suppression

scholarly journals OS12-1-5 THz speckle suppression by Hadamard diffuser

2007 ◽  
Vol 2007.6 (0) ◽  
pp. _OS12-1-5--_OS12-1-5-
Author(s):  
Irina Jaeger ◽  
Johan Stiens ◽  
Gaetan Koers ◽  
Lixiao Zhang ◽  
Roger Vounckx
Keyword(s):  
Speckle Suppression

scholarly journals Calibration Method for Line-Structured Light Three-Dimensional Measurements Based on a Single Circular Target

2022 ◽  
Vol 12 (2) ◽  
pp. 588
Author(s):  
Jun Wang ◽  
Xuexing Li
Keyword(s):  
Structured Light ◽  
Three Dimensional ◽  
Calibration Method ◽  
Optical Center ◽  
3D Measurements ◽  
Light Plane ◽  
Laser Projector ◽  
Dimensional Measurements ◽  
Intersection Points ◽  
Circular Target

Single circular targets are widely used as calibration objects during line-structured light three-dimensional (3D) measurements because they are versatile and easy to manufacture. This paper proposes a new calibration method for line-structured light 3D measurements based on a single circular target. First, the target is placed in several positions and illuminated by a light beam emitted from a laser projector. A camera captures the resulting images and extracts an elliptic fitting profile of the target and the laser stripe. Second, an elliptical cone equation defined by the elliptic fitting profile and optical center of the camera is established based on the projective geometry. By combining the obtained elliptical cone and the known diameter of the circular target, two possible positions and orientations of the circular target are determined and two groups of 3D intersection points between the light plane and the circular target are identified. Finally, the correct group of 3D intersection points is filtered and the light plane is progressively fitted. The accuracy and effectiveness of the proposed method are verified both theoretically and experimentally. The obtained results indicate that a calibration accuracy of 0.05 mm can be achieved for an 80 mm × 80 mm planar target.

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