ZHANG Shao-jun, GOU Zhong-kui, LI Qing-li, LI Zhong-fu, JIN Jian. Digital image processing technology for spur gear measurement[J]. Editorial Office of Optics and Precision Engineering, 2004,(6): 619-625
ZHANG Shao-jun, GOU Zhong-kui, LI Qing-li, LI Zhong-fu, JIN Jian. Digital image processing technology for spur gear measurement[J]. Editorial Office of Optics and Precision Engineering, 2004,(6): 619-625DOI:
Digital image processing technology for spur gear measurement
Non-contact measuring for spur gears using digital image processing technology is studied. At first
distortion correction and filter in the original image captured by CCD camera. Were taken account of edge image of single pixel was achieved after treatments such as threshold segmentation and four-neighborhood erosion based on mathematical morphology. As to the shape character istic of gear
some basic principles such as gravity model
least squares fit
Hough transform
and Bresenham drawing circle were applied synthetically
and the algorithm of measuring numbers of teeth
module
radius of center hole
radius of addendum circle
radius of dedendum circle
modification coefficient
etc. was established. A gear whose diameter of indexing circle is 50 mm was tested using 1280×1024 CCD camera and acquisition block
and the results indicated that absolute error of measuring value is less than a pixel compared with manual measurement; the absolute error of radius of addendum circle-the largest size in all the measuring parameters is 13 μm. The research indicates that by high resolution CCD camera and optical amplifying system
minute gear and high precision gear can be measured
because the higher the resolution of CCD camera is and the smaller the objects are
the higher the measuring precision is
what's more
they are of linear relation. When spur gears whose diameters of indexing circle are less than 5 mm are measured by CCD camera with the resolution of over 1280×1024
the precision of measurement is below than 2 μm.
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references
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