Robust phase-shifting algorithms designed for high-dynamic range in fringe-projection profilometry

2018 ◽  
Author(s):  
Moises Padilla ◽  
Manuel Servin ◽  
Guillermo Garnica
Keyword(s):  
Dynamic Range ◽  
High Dynamic Range ◽  
Phase Shifting ◽  
Fringe Projection ◽  
High Dynamic ◽  
Fringe Projection Profilometry

scholarly journals High-Accuracy 3-D Sensor for Rivet Inspection Using Fringe Projection Profilometry with Texture Constraint

Sensors ◽  
2020 ◽  
Vol 20 (24) ◽  
pp. 7270
Author(s):  
Yunfan Wang ◽  
Huijie Zhao ◽  
Xudong Li ◽  
Hongzhi Jiang
Keyword(s):  
Measurement Accuracy ◽  
Dynamic Range ◽  
High Dynamic Range ◽  
High Accuracy ◽  
Additional Constraint ◽  
Fringe Projection ◽  
Diameter Measurement ◽  
Edge Points ◽  
High Dynamic ◽  
Fringe Projection Profilometry

Riveted workpieces are widely used in manufacturing; however, current inspection sensors are mainly limited in nondestructive testing and obtaining the high-accuracy dimension automatically is difficult. We developed a 3-D sensor for rivet inspection using fringe projection profilometry (FPP) with texture constraint. We used multi-intensity high dynamic range (HDR) FPP method to address the varying reflectance of the metal surface then utilized an additional constraint calculated from the fused HDR texture to compensate for the artifacts caused by phase mixture around the stepwise edge. By combining the 2-D contours and 3-D FPP data, rivets can be easily segmented, and the edge points can be further refined for diameter measurement. We tested the performance on a sample of riveted aluminum frame and evaluated the accuracy using standard objects. Experiments show that denser 3-D data of a riveted metal workpiece can be acquired with high accuracy. Compared with the traditional FPP method, the diameter measurement accuracy can be improved by 50%.

High dynamic range 3D measurements with fringe projection profilometry: a review

2018 ◽  
Vol 29 (12) ◽  
pp. 122001 ◽  
Author(s):  
Shijie Feng ◽  
Liang Zhang ◽  
Chao Zuo ◽  
Tianyang Tao ◽  
Qian Chen ◽  
...  
Keyword(s):  
Dynamic Range ◽  
High Dynamic Range ◽  
Fringe Projection ◽  
3D Measurements ◽  
High Dynamic ◽  
Fringe Projection Profilometry

scholarly journals Multi-polarization fringe projection imaging for high dynamic range objects

2014 ◽  
Vol 22 (8) ◽  
pp. 10064 ◽  
Author(s):  
Basel Salahieh ◽  
Zhenyue Chen ◽  
Jeffrey J. Rodriguez ◽  
Rongguang Liang
Keyword(s):  
Dynamic Range ◽  
High Dynamic Range ◽  
Fringe Projection ◽  
High Dynamic

scholarly journals Adaptive Binocular Fringe Dynamic Projection Method for High Dynamic Range Measurement

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 4023 ◽  
Author(s):  
Changzhi Yu ◽  
Fang Ji ◽  
Junpeng Xue ◽  
Yajun Wang
Keyword(s):  
Projection Method ◽  
Dynamic Range ◽  
Three Dimensional ◽  
High Dynamic Range ◽  
Fringe Projection ◽  
Range Measurement ◽  
Optimal Projection ◽  
Three Dimensional Measurement ◽  
High Dynamic ◽  
Adaptively Adjusting

Three-dimensional measurement with fringe projection sensor has been commonly researched. However, the measurement accuracy and efficiency of most fringe projection sensors are still seriously affected by image saturation and the non-linear effects of the projector. In order to solve the challenge, in conjunction with the advantages of stereo vision technology and fringe projection technology, an adaptive binocular fringe dynamic projection method is proposed. The proposed method can avoid image saturation by adaptively adjusting the projection intensity. Firstly, the flowchart of the proposed method is explained. Then, an adaptive optimal projection intensity method based on multi-threshold segmentation is introduced to adjust the projection illumination. Finally, the mapping relationship of binocular saturation point and projection point is established by binocular transformation and left camera–projector mapping. Experiments demonstrate that the proposed method can achieve higher accuracy for high dynamic range measurement.

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