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Height measurement of microchip connecting pins by use of stereovision
Cho Jui Tay1, Xin Kang, Chenggen Quan
1Department of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260. mpetaycj@nus.edu.sg
Abstract:
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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