title: Height measurement of microchip connecting pins by use of stereovision.
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.
authors.affiliation: Department of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260. mpetaycj@nus.edu.sg
authors.forename: Cho Jui
authors.initials: CJ
authors.lastname: Tay
authors.forename: Xin
authors.initials: X
authors.lastname: Kang
authors.forename: Chenggen
authors.initials: C
authors.lastname: Quan
authors.forename: Xiao Yuan
authors.initials: XY
authors.lastname: He
authors.forename: Huai Min
authors.initials: HM
authors.lastname: Shang