Wide-angle lenses distortion calibration using phase demodulation of phase-shifting fringe-patterns

2020 ◽  
Vol 49 (6) ◽  
pp. 20200039
Author(s):  
周维帅 Weishuai Zhou ◽  
翁嘉文 Jiawen Weng ◽  
彭军政 Junzheng Peng ◽  
钟金钢 Jingang Zhong
Keyword(s):  
Phase Shifting ◽  
Wide Angle ◽  
Fringe Patterns ◽  
Phase Demodulation

Wide-angle lenses distortion calibration using phase demodulation of phase-shifting fringe-patterns

2020 ◽  
Vol 49 (6) ◽  
pp. 20200039
Author(s):  
周维帅 Weishuai Zhou ◽  
翁嘉文 Jiawen Weng ◽  
彭军政 Junzheng Peng ◽  
钟金钢 Jingang Zhong
Keyword(s):  
Phase Shifting ◽  
Wide Angle ◽  
Fringe Patterns ◽  
Phase Demodulation

Temporal evaluation of fringe patterns with spatial carrier with an improved asynchronous phase demodulation algorithm

2004 ◽  
Vol 51 (1) ◽  
pp. 97-109 ◽  
Author(s):  
J. A. Gómez-Pedrero ◽  
J. A. Quiroga ◽  
M. Servín
Keyword(s):  
Fringe Patterns ◽  
Phase Demodulation

A New Three-Dimensional Profilometer for Surface Profile Measurement Using Digital Fringe Projection and Phase Shifting

2005 ◽  
Vol 295-296 ◽  
pp. 471-476
Author(s):  
Liang Chia Chen ◽  
S.H. Tsai ◽  
Kuang Chao Fan
Keyword(s):  
High Speed ◽  
Structured Light ◽  
Three Dimensional ◽  
Surface Profile ◽  
Phase Shifting ◽  
Fringe Projection ◽  
Surface Measurement ◽  
Profile Measurement ◽  
Digital Fringe Projection ◽  
Fringe Patterns

The development of a three-dimensional surface profilometer using digital fringe projection technology and phase-shifting principle is presented. Accurate and high-speed three-dimensional profile measurement plays a key role in determining the success of process automation and productivity. By integrating a digital micromirror device (DMD) with the developed system, exclusive advantages in projecting flexible and accurate structured-light patterns onto the object surface to be measured can be obtained. Furthermore, the developed system consists of a specially designed micro-projecting optical unit for generating flexibly optimal structured-light to accommodate requirements in terms of measurement range and resolution. Its wide angle image detection design also improves measurement resolution for detecting deformed fringe patterns. This resolves the problem in capturing effective deformed fringe patterns for phase shifting, especially when a coaxial optical layout of a stereomicroscope is employed. Experimental results verified that the maximum error was within a reasonable range of the measured depth. The developed system and the method can provide a useful and effective tool for 3D full field surface measurement ranging from µm up to cm scale.

scholarly journals Reconstruction of Isolated Moving Objects by Motion-Induced Phase Shift Based on PSP

2021 ◽  
Vol 12 (1) ◽  
pp. 252
Author(s):  
Ke Wu ◽  
Min Li ◽  
Lei Lu ◽  
Jiangtao Xi
Keyword(s):  
Phase Shift ◽  
Fringe Pattern ◽  
Moving Objects ◽  
Object Motion ◽  
Moving Object ◽  
Phase Shifting ◽  
Phase Information ◽  
Object Reconstruction ◽  
Fringe Patterns

The reconstruction of moving objects based on phase shifting profilometry has attracted intensive interests. Most of the methods introduce the phase shift by projecting multiple fringe patterns, which is undesirable in moving object reconstruction as the errors caused by the motion will be intensified when the number of the fringe pattern is increased. This paper proposes the reconstruction of the isolated moving object by projecting two fringe patterns with different frequencies. The phase shift required by the phase shifting profilometry is generated by the object motion, and the model describing the motion-induced phase shift is presented. Then, the phase information in different frequencies is retrieved by analyzing the influence introduced by movement. Finally, the mismatch on the phase information between the two frequencies is compensated and the isolated moving object is reconstructed. Experiments are presented to verify the effectiveness of the proposed method.

scholarly journals Tactile Whole-Field Imaging Sensor on Photoelasticity

2007 ◽  
Author(s):  
Venketesh N. Dubey ◽  
Gurtej S. Grewal
Keyword(s):  
Phase Shifting ◽  
Sensing Applications ◽  
Shear Loads ◽  
Photoelastic Effect ◽  
Low Modulus ◽  
Fringe Patterns ◽  
Imaging Sensor ◽  
Field Imaging ◽  
New Strategies

The paper describes a whole-field imaging sensor developed on the principles of photoelasticity. The sensor produces colored fringe patterns when load is applied on the contacting surface. These fringes can be analyzed using conventional photoelastic techniques, however, as the loading in the present case is not conventional some new strategies need to be devised to analyze the load imprint. The loading is unconventional in the sense that low modulus photoelastic material is deformed under vertical load in the direction of light travel to induce the photoelastic effect. The paper discusses the efficacy of both RGB calibration and phase shifting techniques in sensing applications. The characteristics of fringe patterns obtained under vertical and shear loads have been studied and the results obtained under these conditions are discussed with their limitations specifically when this is applied for sensing applications. Finally a case study has been conducted to analyze a foot image and conclusions drawn from this have been presented.

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