OCR Functions
The following functions are available only with a licensed version of NI Vision.
Use the optical character recognition (OCR) functions to develop an OCR read application.
OCR 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 NI 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.
The following table lists the OCR functions. The functions in the OCR class are grouped according to the types of operations they perform. The first column contains the name of the class. The second column contains names of individual function panels. Each OCR function panel represents one function.
| Class | LabWindows/CVI Equivalent | Function Name |
|---|---|---|
| OCR | Create Character Set | imaqCreateCharSet |
| OCR | Delete Character | imaqDeleteChar |
| OCR | Get Character Count | imaqGetCharCount |
| OCR | Get Character Info 2 | imaqGetCharInfo2 |
| OCR | Read OCR File | imaqReadOCRFile |
| OCR | Read Text 3 | imaqReadText3 |
| OCR | Rename Character | imaqRenameChar |
| OCR | Set Reference Character | imaqSetReferenceChar |
| OCR | Train Characters | imaqTrainChars |
| OCR | Verify Patterns | imaqVerifyPatterns |
| OCR | Verify Text | imaqVerifyText |
| OCR | Write OCR File | imaqWriteOCRFile |