2020
DOI: 10.1364/oe.403013
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Displacement-free stereoscopic phase measuring deflectometry based on phase difference minimization

Abstract: In this paper, we propose a phase difference minimization algorithm to measure the specular surface shape in a displacement-free stereoscopic phase measuring deflectometry (PMD) system. The presented system is capable of solving the height-normal ambiguity appearing in a PMD system without moving any system component. Both the surface normal and the absolute height are simultaneously obtained by implementing phase difference minimization between the phase distributions in the LCD screen and the camera image pl… Show more

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Cited by 13 publications
(2 citation statements)
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“…In the stereo deflectometry, the normal vector at a measured point is specified by the geometrical constraints provided by the imaging relationship between the two cameras, as shown in Figure 6 [15]. After reconstruction from the partial gradients using the Zernike modal method [16], the form of the overlapped area BC can be obtained.…”
Section: Extension Of Stereo Deflectometrymentioning
confidence: 99%
“…In the stereo deflectometry, the normal vector at a measured point is specified by the geometrical constraints provided by the imaging relationship between the two cameras, as shown in Figure 6 [15]. After reconstruction from the partial gradients using the Zernike modal method [16], the form of the overlapped area BC can be obtained.…”
Section: Extension Of Stereo Deflectometrymentioning
confidence: 99%
“…Similar to Liu's system, Li et al [7] construct a biplanar PMD structure by using an ordinary screen and a transparent screen. Instead of adding one screen, ambiguity can also be eliminated by using stereo-PMD, which uses two cameras [8][9][10][11][12][13][14][15][16][17][18]. Reflected points (RP) are searched along the incident rays of the first camera, and the second camera is utilized to aid the first camera in determining points by matching normal to both the first camera and the second camera.…”
Section: Introductionmentioning
confidence: 99%