How to test the VFD displays

[Tanite]

Hi all,

We are currently setting up a machine vision use LabWindows CVI and NI IMAQ
Our goal is to test a VFD 132X4 pixel
1) Can you tell me how to count the number of pixels on the VFD display images?
Function that allows it Through the Library NI IMAQ?
2) How to detect the alinement of the VFD?

Do you have a exemlpe?

I thank you in advance

[Courtney_L]

Hi Tanite,

There are a few shipping examples for using IMAQ with CVI. The examples can be found by opening CVI and navigating to Help » Find Examples. Once in the folder, I selected the search tab and typed in IMAQ. The results include 10 sample projects on subjects such as performing a Grab and Attributes Setup, a Low-Level Grab, etc. I'd recommend checking here to see if any of these examples have the functionality you're looking for.

[Tanite]

Hi Courtney L,

Thank you very much for your answer !
I already watched the NI IMAQ examples, but I can not find a clear solution
For my project, I try to actually calculate the numbers of pixels in the image

Attached is an example of an image I try to find the number of pixels
Can you tell me what functions to use ?

Well thank you for the support, it really is very nice

[Courtney_L]

Hey Tanite, 

I found a few links that might be helpful:

 http://lavag.org/topic/6917-pixel-count-in-roi/

http://forums.ni.com/t5/Machine-Vision/how-do-I-get-machine-vision-collected-data-to-show-on-the-fro...

In LabVIEW the VI to determine the number of pixels to use would be "IMAQ GetImageSize" - there should be an equivalent in CVI. For your alignment question, can I ask you to clarify things a little bit, ie, what are you looking for in terms of detecting the alignment?