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A stereovision method for estimating the height of connecting pins on a microchip is described. The technique uses a centroidal method to simplify the calculation. A few seconds are required for a Pentium 586 PC to calculate the heights of 300 connecting pins on a 50 mm x 50 mm microchip. The method is described, and experimental results are presented. The optical system, which consists of two CCD cameras with long-focal-length lenses and a two-channel digital image grabber, is capable of in situ measurement.
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Tay et al. (2003) studied this question.
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