National Instruments IMAQ Vision for LabWindows TM /CVI - page 48

Chapter 4 Performing Particle Analysis

IMAQ Vision for LabWindows/CVI User Manual 4-6 ni.com

IMAQ_MT_EQUIVALENT_ELLIPSE_MAJOR_AXIS Length of the major axis of the ellipse

with the same perimeter and area as

the particle

IMAQ_MT_EQUIVALENT_ELLIPSE_MINOR_AXIS Length of the minor axis of the

ellipse with the same perimeter

andarea as the particle

IMAQ_MT_EQUIVALENT_ELLIPSE_MINOR_AXIS_FERET Length of the minor axis of the

ellipse with the same area as the

particle, and major axis equal in

length to the max feret diameter

IMAQ_MT_EQUIVALENT_RECT_DIAGONAL Distance between opposite corners of

the rectangle with the same perimeter

and area as the particle

IMAQ_MT_EQUIVALENT_RECT_LONG_SIDE Longest side of the rectangle with

thesame perimeter and area as the

particle

IMAQ_MT_EQUIVALENT_RECT_SHORT_SIDE Shortest side of the rectangle with

thesame perimeter and area as the

particle

IMAQ_MT_EQUIVALENT_RECT_SHORT_SIDE_FERET Shortest side of the rectangle with the

same area as the particle, and longest

side equal in length to the max feret

diameter

IMAQ_MT_ELONGATION_FACTOR Max feret diameter divided by

equivalent rectangle short side (feret)

IMAQ_MT_FIRST_PIXEL_X X-coordinate of the highest, leftmost

particle pixel

IMAQ_MT_FIRST_PIXEL_Y Y-coordinate of the highest, leftmost

particle pixel

IMAQ_MT_HU_MOMENT_1 First Hu moment

IMAQ_MT_HU_MOMENT_2 Second Hu moment

IMAQ_MT_HU_MOMENT_3 Third Hu moment

IMAQ_MT_HU_MOMENT_4 Fourth Hu moment

Table 4-1. Particle Measurements (Continued)

Measurement Description

Contents

Main IMAQ Page Important Information Warranty Copyright Trademarks Patents Contents About This Manual Chapter 1 Introduction to IMAQ Vision Chapter 2 Getting Measurement-Ready Images Chapter 3 Making Grayscale and Color Measurements Chapter 4 Performing Particle Analysis Chapter 5 Performing Machine Vision Tasks Chapter 6 Calibrating Images Page About This Manual Conventions Related Documentation IMAQ Vision NI Vision Assistant NI Vision Builder for Automated Inspection Other Documentation Introduction to IMAQ Vision About IMAQ Vision Application Development Environments IMAQ Vision Function Tree IMAQ Machine Vision Function Tree Creating IMAQ Vision Applications Chapter 1 Introduction to IMAQ Vision National Instruments Corporation 1-5 IMAQ Vision for LabWindows/CVI User Manual Chapter 1 Introduction to IMAQ Vision IMAQ Vision for LabWindows/CVI User Manual 1-6 ni.com Getting Measurement-Ready Images Set Up Your Imaging System Calibrate Your Imaging System Create an Image Page Source and Destination Images Acquire or Read an Image Acquiring an Image Reading a File Converting an Array to an Image Display an Image Attach Calibration Information Analyze an Image Improve an Image Lookup Tables Filters Convolution Filter Nth Order Filter Grayscale Morphology FFT Complex Image Operations Making Grayscale and Color Measurements Define Regions of Interest Defining Regions Interactively Page Page Page Tools Palette Transformation Defining Regions Programmatically Defining Regions with Masks Measure Grayscale Statistics Measure Color Statistics Figure 3-4. Primary Components of a 32-Bit Color Image Figure 3-5. Primary Components of a 64-Bit Color Image Note You can also use imaqExtractColorPlanes() to process the red, green, and blue components of a 64-bit image. Comparing Colors Learning Color Information Specifying the Color Information to Learn Using the Entire Image Using a Region in the Image Using Multiple Regions in the Image Choosing a Color Representation Sensitivity Ignoring Learned Colors Performing Particle Analysis Create a Binary Image Improve the Binary Image Removing Unwanted Particles Separating Touching Particles Improving Particle Shapes Make Particle Measurements Page Page Page Page Page Page Performing Machine Vision Tas ks Locate Objects to Inspect Page Using Edge Detection to Build a Coordinate Transform Page Using Pattern Matching to Build a Coordinate Transform Chapter 5 Performing Machine Vision Tasks National Instruments Corporation 5-7 IMAQ Vision for LabWindows/CVI User Manual Choosing a Method to Build the Coordinate Transform Figure 5-4. Building a Coordinate Transform Set Search Areas Defining Regions Interactively Defining Regions Programmatically Find Measurement Points Finding Features Using Edge Detection Finding Lines or Circles Finding Edge Points Along One Search Contour Finding Edge Points Along Multiple Search Contours Finding Points Using Pattern Matching Defining and Creating Good Template Images Symmetry Feature Detail Positional Information Background Information Training the Pattern Matching Algorithm Defining a Search Area Setting Matching Parameters and Tolerances Match Mode Minimum Contrast Rotation Angle Ranges Testing the Search Algorithm on Test Images Using a Ranking Method to Verify Results Finding Points Using Color Pattern Matching Defining and Creating Good Color Template Images Color Information Symmetry Feature Detail Positional Information Training the Color Pattern Matching Algorithm Defining a Search Area Setting Matching Parameters and Tolerances Color Sensitivity Search Strategy Color Score Weight Minimum Contrast Rotation Angle Ranges Testing the Search Algorithm on Test Images Finding Points Using Color Location Convert Pixel Coordinates to Real-World Coordinates Make Measurements Distance Measurements Analytic Geometry Measurements Instrument Reader Measurements Identify Parts Under Inspection Classifying Samples Reading Characters Reading Barcodes Reading 1D Barcodes Reading Data Matrix Barcodes Reading PDF417 Barcodes Display Results Page Page Calibrating Images Perspective and Nonlinear Distortion Calibration Defining a Calibration Template Defining a Reference Coordinate System Page Learning Calibration Information Specifying Scaling Factors Choosing a Region of Interest Choosing a Learning Algorithm Using the Learning Score Learning the Error Map Learning the Correction Table Setting the Scaling Method Calibration Invalidation Simple Calibration Save Calibration Information Attach Calibration Information A Technical Support and Professional Services Glossary Numbers A B Page C D E F G H I Page J K L Page M N O P Q R S T V Index Numerics A B C D E F G H I K L M N O P R S T U V W