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Your guide to Machine Vision
Guide Topics
Machine Vision Systems
Machine Vision Selection Guide
Machine Vision Systems Overview
Image Processing Principles
Inspection Functions
Area Judgment by Binarization
Position Detection
Dimension Measurement
Additional Image Functions
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Machine Vision Systems
  

Dimension Measurement

Using Edge Detection

1. Point of Variation within Window (Edge Detection)

Over the target shape which need to be detected, set X and Y windows as shown in the figure below. Inside these windows are scanned and the first shade change (or color change) is recognized as an edge and its X and Y coordinates are detected. Of course, you can use only X window to detect X coordinates.
Point of variation example

2. Measuring the Distance between Edges with Various Test Mode

Outer diameter measurement   Inner diameter measurement  
Easy Measurement of Distance Between Edges

This function allows measurement of outer or inner diameter by detecting distance between outer edges or inner edges.

Outer diameter Inner diameter
Center pitch   Gap pitch  
Distance Measurement of Multiple Pins

This function measures distance of multiple edges within the window to obtain maximum, minimum, and mean pitch.

Center pitch Gap pitch
No. of edge   Position detection  
Easy Measurement of Number of Edges

This function measures the number of edges (bright to dark or dark to bright) within the window

Number of edges Position detection

3. Inspection Examples

Connector Pin Pitch Measurement
The maximum, minimum, and mean center pitch of all connector pins are measured and if either maximum or minimum value is out of tolerance, it is detected as defective.
Example of dimension measurment   Correct pin pitch
Normal
  Incorrect pin pitch
Abnormal


More on this topic...
-> A Desktop Reference for Sensors, Vision Systems and Measuring Instruments. General Catalog
-> Solve Poka-Yoke Applications with Rapid Setup Vision Sensor Solve Poka-Yoke Applications with Rapid Setup Vision Sensor
Image Processing Handbook: Trend Edge Tool Image Processing Handbook: Trend Edge Tool
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SEM
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