8 March 1999 3D profiling by optical demodulation with an image intensifier
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The acquirement of 3D-information is currently achieved by stereophotography, line and grid projection techniques or by laser scanning in combination with a fast distance measuring device. This paper describes a new principle using a single CCD-camera with an optical demodulator in front of it. The scene is illuminated by a high frequency intensity modulated light source. Demodulating the backscattered light by a gateable image intensifier yields a grey level image which directly corresponds to the object's form. Intensity variations within the image due to inhomogeneous object reflectivity or illumination intensity are overcome by a phase shift technology. Possible applications for such a 3D- camera industrial automation, medical and industrial endoscopic analyses, robotics or 3D-digitalization.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Heinrich A. Hoefler, Heinrich A. Hoefler, Volker Jetter, Volker Jetter, Elmar E. Wagner, Elmar E. Wagner, } "3D profiling by optical demodulation with an image intensifier", Proc. SPIE 3640, Three-Dimensional Image Capture and Applications II, (8 March 1999); doi: 10.1117/12.341068; https://doi.org/10.1117/12.341068

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