Title :
Measurement of the effective focal length by the centerline detection of light stripes
Author :
Zhang, Zhenjiu ; Hu, Hong
Author_Institution :
Dept. of Mech. Eng. & Autom., Harbin Inst. of Technol. Shenzhen Grad. Sch., Harbin, China
Abstract :
A composite method for detecting the centerline of straight light stripe is presented in this paper. In order to locate the image of stripe, a conditional dilation algorithm based on mathematical morphology is proposed to extract the regions of interest (ROI), and a shape factor is applied to eliminate the disturbance regions, so the straight light stripes are determined finally. Barycenter method is used to detect the centerline of stripe, and the outliers on the detected centerline are removed by a method based on probabilistic theory. The novel method has been used in the effective focal length measurement and the accuracy of measurement is better than 0.2 percent.
Keywords :
feature extraction; mathematical morphology; object detection; optical images; optical variables measurement; probability; Barycenter method; centerline detection; conditional dilation algorithm; disturbance region elimination; focal length measurement; image location; light stripes; mathematical morphology; probabilistic theory; regions of interest; Charge coupled devices; Curve fitting; Length measurement; Lenses; Manufacturing industries; Optical collimators; Optical sensors; Protective relaying; Quality control; Relays; ROI extraction; centerline detection; conditional dialtion algorithm; effective focal length measurement;
Conference_Titel :
Robotics Automation and Mechatronics (RAM), 2010 IEEE Conference on
Conference_Location :
Singapore
Print_ISBN :
978-1-4244-6503-3
DOI :
10.1109/RAMECH.2010.5513160
