National Instruments IMAQTM 用户手册

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Before you classify objects, you must create a classifier file with samples 
of the objects using the NI Classification Training Interface. Go to Start»
Programs»National Instruments»Classification Training to launch the 
NI Classification Training Interface.

After you have trained samples of the objects you want to classify, use the 
following methods to classify the image under inspection:

•

Use 

CWIMAQVision.ReadClassifierFile

 to read in the classifier 

file you created with the NI Classification Training Interface. 

•

Use 

CWIMAQClassifier.Classify

 to classify the image under 

inspection.

Use OCR to read text and/or characters in an image. Typical uses for OCR 
in an inspection application include identifying or classifying components.

Before you read text and/or characters in an image, you must create a 
character set file with samples of the characters using the OCR Training 
Interface. Go to Start»Programs»National Instruments»Vision»OCR 
Training to launch the OCR Training Interface.

After you have trained samples of the characters you want to read, use the 
following methods to read the characters:

•

Use 

NIOCR.ReadOCRFile

 to read in a character set file that you 

created using the OCR Training Interface.

•

Use 

NIOCR.ReadText

 to read the characters inside the ROI of the 

image under inspection.

Use barcode reading objects to read values encoded into 1D barcodes, Data 
Matrix symbols, and PDF417 symbols.

To read a 1D barcode, locate the barcode in the image using one of the 
techniques described in the 

then pass the Regions parameter into 

CWIMAQVision.ReadBarcode

.

Use 

CWIMAQVision.ReadBarcode

 to read values encoded in the 1D 

barcode. Specify the type of 1D barcode in the application using the 
BarcodeType parameter. IMAQ Vision supports the following 1D barcode