National Instruments IMAQTM ユーザーズマニュアル

niocr.ocx

 provides one ActiveX control and a collection of ActiveX 

objects you use in a machine vision application to perform optical character 
recognition (OCR). 

Use this control to perform OCR, which is the process by which the 
machine vision software reads text and/or characters in an image. OCR 
consists of the following two procedures: 

•

Training characters 

•

Reading characters

Training characters is the process by which you teach the machine vision 
software the types of characters and/or patterns you want to read in the 
image during the reading procedure. You can use IMAQ Vision to train any 
number of characters, creating a character set, which is the set of characters 
that you later compare with objects during the reading procedure. You store 
the character set you create in a character set file. Training might be a 
one-time process, or it might be a process you repeat several times, creating 
several character sets to broaden the scope of characters you want to detect 
in an image.

Reading characters is the process by which the machine vision application 
you create analyzes an image to determine if the objects match the 
characters you trained. The machine vision application reads characters in 
an image using the character set that you created when you trained 
characters.

cwmv.ocx

 contains one ActiveX control and a collection of ActiveX 

objects. Refer to the 

 section for more information about 

ActiveX objects.

Use this control to perform high-level machine vision tasks, such as 
measuring distances. This control is written entirely in Visual Basic using 
the methods on the CWIMAQVision and CWIMAQViewer controls. The 
source code for the CWMachineVision control is included in the product. 
For more information about CWMachineVision methods, refer to 
Chapter 5, 

.