Deflectometry using portable devices


2019-10-14 10:10 In addition, we develop a multiview technique to compensate for the small screen of a mobile device so that large surfaces can be densely reconstructed in their entirety. This work is a first step towards developing a selfcalibrating Deflectometry procedure capable of taking 3D surface measurements of specular objects in the wild and accessible to users with little to no technical imaging experience.

Deflectometry is a powerful metrology technique that uses offtheshelf equipment to achieve nanometerlevel accuracy surface measurements. However, there is no portable device to quickly measure eyeglasses, lenses, or mirrors. deflectometry using portable devices Deflectometry is used in a wide range of metrology applications, such as: plastic lens and car body inspection with submicrometer level accuracy [1, a nanometer for xray mirrors [4. A deflectometry apparatus consists of digital display and camera,

Uncalibrated Deflectometry with a Mobile Device on Extended Specular Surfaces FLORIAN WILLOMITZER, 1, CHIAKAI YEH, 1 VIKAS GUPTA, 1 WILLIAM SPIES, 1 FLORIAN SCHIFFERS, 1 MARC WALTON, 2 OLIVER COSSAIRT1 deflectometry using portable devices

Feb 01, 2015  title Deflectometry using portable devices , abstract Deflectometry is a powerful metrology technique that uses offtheshelf equipment to The deflectometry provides a powerful metrological technique enabling the highprecision testing of reflective surfaces with high dynamic range, such as aspheric and freeform surfaces. In the fringeillumination deflectometry based on reverseHartmanntest configuration, the calibration of system geometry is required to achieve& # x201C; null& # x201D; testing. How can the answer be improved? deflectometry using portable devices We introduce a system and methods for the threedimensional measurement of extended specular surfaces with high surface normal variations. Our system consists only of a mobile hand held device and exploits screen and front camera for Deflectometrybased surface measurements Binary Pattern Deflectometry allows almost instant, simple, and accurate slope retrieval, which is required for applications using mobile devices. The paper details the theory of this deflectometry method and the challenges of its implementation. Furthermore, the binary pattern method can also be combined with a classic phaseshifting method to Deflectometry is a powerful metrology technique that uses offtheshelf equipment to achieve nanometerlevel accuracy surface measurements. However, there is no portable device to quickly measure eyeglasses, lenses, or mirrors.



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