National Instruments IMAQTM

Contents

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..........................................................5-12

Defining and Creating Effective Template Images...........................5-13

Training the Pattern Matching Algorithm.........................................5-15

Defining a Search Area.....................................................................5-16

Setting Matching Parameters and Tolerances...................................5-17

Testing the Search Algorithm on Test Images..................................5-18

Using a Ranking Method to Verify Results......................................5-19

Finding Points Using Color Pattern Matching................................................5-19

Defining and Creating Effective Color Template Images................ 5-20

Training the Color Pattern Matching Algorithm...............................5-21

Defining a Search Area.....................................................................5-22

Setting Matching Parameters and Tolerances...................................5-23

Testing the Search Algorithm on Test Images..................................5-25

Finding Points Using Color Location..............................................................5-25

Convert Pixel Coordinates to Real-World Coordinates.................................................5-26

Make Measurements......................................................................................................5-26

Distance Measurements...................................................................................5-26

Analytic Geometry Measurements..................................................................5-27

Instrument Reader Measurements...................................................................5-28

Identify Parts Under Inspection.....................................................................................5-28

Classifying Samples........................................................................................5-28

Reading Characters..........................................................................................5-29

Reading Barcodes............................................................................................5-29

Read 1D Barcodes.............................................................................5-29

Read Data Matrix Barcode................................................................5-30

Read PDF417 Barcode......................................................................5-31

Display Results..............................................................................................................5-31