image recognition of numerical display

[labmaster]

I would like to set up some image recognition of LCD display (0.5~2 cm in each dimension for each digit).

Unfortunately, I am a beginer in IMAQ in my academic research.

The recognized number of the display and obtained real number from DAQ (from an independent multithread) will be compared each other.

Could you estimate the comparing speed (what times per sec) and failure rate (incorrect-reading)?

Would you please let me know some document for this starting point and what hardware and software should I prepare for my purpose?

(CCD, Labview, image recognition tools)

Some specific commercial brandnames are welcomed for my convenience and understanding..

메시지가 07-07-2008 10:48 PM에 labmaster에 의해 편집되었음

[muks]

Is there anyway to get the lcd output directly to pc via rs232? have u explored this? r u talking abt OCR?The have a look at this page


zone.ni.com/devzone/cda/epd/p/id/5575



Hope it helps

[Nate.H]

Dear LabMaster,

Tools exist in the Vision Development Module for implementing OCR (Optical Character Recognition). Specifically, there are already two VIs provided under the Vision and Motion»Machine Vision»Instrument Readers palette. There is also an OCR palette.

To acquire the image, you will need a grayscale camera and the appropriate NI IMAQ driver. You have the choice of a variety of camera buses if you have not purchased a camera yet, and you can learn more about their various features here:

Choosing the Right Camera Bus
http://zone.ni.com/devzone/cda/tut/p/id/5386

To do the comparison, you will have to figure out a way to synchronize the DAQ readings with each analyzed frame from your camera. Once you do this, it shouldn't be hard to time the loop execution to get an idea of the comparison speed, and to keep track of the failure rate in LabVIEW.

So for the Hardware: Camera, DAQ card, and whatever cabling is necessary to connect and synchronize them.

For the Software: LabVIEW with the Vision Development Module, or you could also investigate VBAI (Vision Builder for Automated Inspection), though I would recommend sticking to LabVIEW for this kind of application.

Best Regards,

~Nate