Abstract
When three-dimensional optical topometry of technicalsurfaces is performed, one major problem is that often the localreflectance of the object's surface varies within a widerange. This leads to overexposed and underexposed areas on thedetector, where no measurements can be made. To overcome thisproblem, we have developed a method that extends the dynamic range ofan imaging system. As an example we implemented this method to ameasurement system that is based on fringe projection with a dataprojector and a color CCD camera. By projection ofquasi-monochromatic fringes a different dynamic range in each of thethree color channels of the camera is achieved. Hence the overalldynamic range of the system is increased by a factor larger than5.
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