By Song Zhang
Digital fringe projection (DFP) recommendations are used for non-contact form size of 3D pictures. within the speedily increasing box of 3D high-speed imaging, the call for for DFP maintains to develop end result of the technology’s quickly pace, flexibility, low-cost, and excessive accuracy.
High-Speed 3D Imaging with electronic Fringe Projection Techniques discusses the new release of electronic fringe with electronic video projection units, overlaying numerous middle technical elements. The booklet starts off by means of developing the theoretical foundations of fringe trend research, reviewing numerous 3D imaging thoughts whereas highlighting some great benefits of DFP. the writer then:
- Describes the diversities among electronic gentle processing (DLP), lcd (LCD), and liquid crystal on silicon (LCoS)
- Explains how you can unwrap section maps temporally and spatially
- Shows the best way to generate fringe styles with video projectors
- Demonstrates easy methods to convert section to coordinates via method calibrations
- Provides a close instance of a built-from-scratch 3D imaging system
Incorporating worthy insights won throughout the author’s 15+ years of 3D imaging study, High-Speed 3D Imaging with electronic Fringe Projection Techniques illuminates the pathway to development in high-speed 3D optical imaging utilizing DFP.
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Additional resources for High-Speed 3D Imaging with Digital Fringe Projection Techniques
Because of their different operation mechanisms, measurement error could be introduced without careful considerations and handling. The key to successfully perform measurements for a DFP system is to properly generate fringe patterns with a computer, send those patterns to the projector, and then capture those patterns by the camera. It is highly desirable to capture high-quality sinusoidal for high-quality 3D imaging. Yet, in most cases, before any 3D imaging, phase unwrapping is usually required.
The blue–green light is split again by another dichroic mirror (D2) into blue and green lights. The green light eventually enters the dichroic prism after passing through the green LCD. Similarly, the blue light enters the dichroic prism after being redirected by two regular mirrors (M2 and M3) and passing through the blue LCoS. Finally, the dichroic prism combines all the lights that are sent to the projection lens for display. The same photodiode was used to test the response of an LCD projector (Epson 730HD, Nagano, Japan) to different grayscale images.
8 illustrates one possible optical configuration for an LCoS projection system. The white light coming out of a lamp is split into two different color spectral, the red and the blue–green, by a dichromic mirror (D1). The red light enters a polarizing beam splitter (B1), hits the red LCoS, and is reflected back to the dichroic prism (P). The blue–green light, redirected by a regular mirror (M1), is split again by another dichroic mirror (D2) into blue and green lights. The green light eventually enters the dichroic prism after passing through the polarizing beam splitter (B2) and being reflected back by the green LCoS.
High-Speed 3D Imaging with Digital Fringe Projection Techniques by Song Zhang