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© 2016 Cognex Confidential 1
INTRODUCTION TO MACHINE VISION
TOOLS AND METHODOLOGIES
Shweta Kapdoskar
Product Marketing Manager, Machine Vision
© 2016 Cognex Confidential 2
AGENDA
What is machine vision?
What is image analysis?
Principal image analysis tools
Summary of key points
Q&A
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WHAT IS MACHINE VISION?
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A SIMPLE CONCEPT
Formal definition:
Machine vision is the use of devices for optical non-contact sensing to automatically receive and interpret an image of a real scene in order to obtain information and/or control machines or processes.
- from the Society of Manufacturing Engineers
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MACHINE VISION SYSTEM
5
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IMAGE ANALYSIS
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IMAGE ANALYSIS TOOLS
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Trained Part
Out of focus
180° Rotation
Reversed Polarity Occlusion
Scale Change
Dim Lighting
Confusing Background
PATTERN SEARCH TOOL
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WHAT TO LOOK FOR IN PATTERN
MATCHING TECHNOLOGY?
Pattern-based search technology more closely resembles the way humans discern between similar things and recognize familiar ones.
Consider the examples of remembering the faces of people.
Even if the faces change due to lighting, extra features, and less features, you will still likely recognize them if there is enough of the original detail intact.
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PATTERN MATCHING
CHALLENGES
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OVERCOMING INSPECTION
OBSTACLES
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Have you used machine vision analysis tools before?
a. Yes
b. No
POLL QUESTION #1
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EDGE DETECTION
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INSPECTEDGE
Detect short shots on caps
Chips in outer boundary
Deformations on the outer circumference of a bottle Or even to Find the minimum width and maximum width in a PET bottle
Bead Inspection
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ADVANCED EDGE INSPECTION
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CALIPER TOOLS
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CALIPER APPLICATIONS
Ideal for gauging applications
Measure the width of a part
Measure the distance between parts
Useful when fixturing a part
When a part has positional uncertainty
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BLOB DETECTION
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BLOB TOOL
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Which of the following best describes your industry?
a. Food and Beverage
b. Automotive
c. Consumer
d. Electronics
e. Other
POLL QUESTION #2
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OPTICAL CHARACTER
RECOGNITION /VERIFICATION
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OCRMAX AUTOTUNE
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BARCODE READING
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HISTOGRAM
Histogram is a graphical representation of statistics and grey values found within a specified area of the image.
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COLOR ANALYSIS
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COLOR VERIFICATION
Is this the correct color?
Color Monitoring/Uniformity of color (Color ID)
Single color detection
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COLOR QUANTITY
How much of each color is found?
Color Makeup Inspection – Quantify the distribution of color(s) across the part
Extract specific
color sets
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COLOR TOOLS
Match Color – Measure Color
Average color found in region
Returns RGB and HSI value
Match score to trained color
24 bit color resolution
Color Sorting, Color Monitoring, Color ID, Single Color Verification
Extract Color – Measure Amount of Color(s)
Extracts specific colors for inspection
Outputs pixel counts, match scores & filtered images
16 bit color resolution
Color Filters, Color Blobs, Pixel Counting, Color Complexity, Color Verification
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SUMMARY
• Machine Vision : enables better, faster and less expensive manufacturing.
• Image Analysis Methodologies and Tools : Pattern Matching, Edge Detection, OCR, BarCode Reading, Blob Analysis and Color Tools
Don't go for it alone...get help from experts!
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THANK YOU FOR YOUR TIME