National Instruments IMAQ Vision for LabWindows TM /CVI - Manual (Page 5)

Contents
IMAQ Vision for LabWindows/CVI User Manual vi ni.com
Chapter 3
Making Grayscale and Color Measurements
Define Regions of Interest............................................................................................. 3-1
Defining Regions Interactively ....................................................................... 3-1
Tools Palette Transformation ........................................................... 3-5
Defining Regions Programmatically............................................................... 3-6
Defining Regions with Masks......................................................................... 3-6
Measure Grayscale Statistics ......................................................................................... 3-7
Measure Color Statistics................................................................................................ 3-7
Comparing Colors ........................................................................................... 3-9
Learning Color Information ............................................................................ 3-9
Specifying the Color Information to Learn ...................................... 3-9
Choosing a Color Representation Sensitivity ................................... 3-12
Ignoring Learned Colors................................................................... 3-13
Chapter 4
Performing Particle Analysis
Create a Binary Image ................................................................................................... 4-1
Improve the Binary Image............................................................................................. 4-2
Removing Unwanted Particles........................................................................ 4-3
Separating Touching Particles ........................................................................ 4-3
Improving Particle Shapes .............................................................................. 4-3
Make Particle Measurements ........................................................................................ 4-4
Chapter 5
Performing Machine Vision Tasks
Locate Objects to Inspect .............................................................................................. 5-2
Using Edge Detection to Build a Coordinate Transform ................................ 5-4
Using Pattern Matching to Build a Coordinate Transform ............................. 5-6
Choosing a Method to Build the Coordinate Transform................................. 5-7
Set Search Areas............................................................................................................ 5-8
Defining Regions Interactively ....................................................................... 5-8
Defining Regions Programmatically............................................................... 5-9
Find Measurement Points .............................................................................................. 5-9
Finding Features Using Edge Detection ......................................................... 5-9
Finding Lines or Circles ................................................................... 5-10
Finding Edge Points Along One Search Contour ............................. 5-11
Finding Edge Points Along Multiple Search Contours .................... 5-12
Finding Points Using Pattern Matching .......................................................... 5-13
Defining and Creating Good Template Images ................................ 5-13
Training the Pattern Matching Algorithm ........................................ 5-15