title: Enhancement of the dynamic range of the detected intensity in an optical measurement system by a three-channel technique.
abstract: When three-dimensional optical topometry of technical surfaces is performed, one major problem is that often the local reflectance of the object's surface varies within a wide range. This leads to overexposed and underexposed areas on the detector, where no measurements can be made. To overcome this problem, we have developed a method that extends the dynamic range of an imaging system. As an example we implemented this method to a measurement system that is based on fringe projection with a data projector and a color CCD camera. By projection of quasi-monochromatic fringes a different dynamic range in each of the three color channels of the camera is achieved. Hence the overall dynamic range of the system is increased by a factor larger than 5.
authors.affiliation: Institut für Technische Optik, Universität Stuttgart, Germany. proll@ito.uni-stuttgart.de
authors.forename: Klaus-Peter
authors.initials: KP
authors.lastname: Proll
authors.forename: Jean-Marc
authors.initials: JM
authors.lastname: Nivet
authors.forename: Christoph
authors.initials: C
authors.lastname: Voland
authors.forename: Hans J
authors.initials: HJ
authors.lastname: Tiziani