II. COMPOSITION OF THE MEASURING SYSTEM
III. IMAGE PROCESSING
A. Grayscale Processing
C. Median Filtering
D. Contour Extraction
B. Binarization
IV. SYSTEM CALIBRATION AND PARAMETER ACQUISITION
A. System Calibration
D. Module
B. The Gear Center, Outside Diameter, Root Diameter
E. The Keyway Depth and Width
C. Number of Teeth
F. Dimension Marking
V. EXPERIMENTAL RESULTS AND SUMMARY