How , from an IMAQ image turned into Array, split it in two pieces , and show them as IMAQ image after ?

[Magea]

Hi

I am currently using the IMAQ vi's to get an image in real time out of a camera with 1024*1024 pixels.

What I am trying to do is :

1) Get the IMAQ image ( OK )

2) turn it into Array ( OK )

3) Get 2 smaller arrays ,each containing half the rows, one the top rows, the other one the bottom rows (not OK )

4) Do some calculations with those arrays ( multiplicate / divide them ) ( not OK )

5) Show the array resulting of the calculations as an XY pixels map just like the first IMAQ image i had ( not OK )

Could you please guide in the resolution of this ? I am litle confused ...

Step 3), I figured out that using the "Delete from Array" VI could be the right one, but I do not understand how to select half the rows ( top or bottom )

Step 4), I think I will not have problem to do this.

Step 5) this one I am lost, I can only plot some waveform out of this, but never a XY pixel map like the IMAQ

Thak you !

[Sam_Sharp]

The array size function will give you the dimensions of the array (in your case - 1024 by 1024). The first element in the array returned is the number of rows.

You can then use either the Delete from Array to delete half the rows - it will return the deleted portion as well as the array with the items deleted (essentially splitting the array). You can also use Array Subset, which just returns a section from the array without modifying the original array.

[Magea]

Alright, thank you for this addition.

To be able to graph an image again after my analysis, just like if I would use an "Array to IMAQ" vi, can you giv me a hint ? 

[Sam_Sharp]

Use the 'Array to IMAQ' VI! You've already found the IMAQ Image to Pixel array function, so just use the reverse operation VI. There is 'IMAQ ArrayToImage' and 'IMAQ ArrayToColorImage' - depending on the type of image you have. You can then wire the output of that to an IMAQ Image control on your front panel.

[Magea]

Hi again Sam,

I must say I feel confused, but I can not found in my library the "IMAQ toimage" Vi !

To be more specific, I have no VI starting by "IMAQ array ..."

I am using Labview 8.5

Is it me not seeing the giant elephant under my noze, or ? 

Thank you !

[Sam_Sharp]

I have the following in LabVIEW 2013:

(Unfortunately I don't have LabVIEW 8.5 to see if it is there)

[Magea]

Alright, I see.

the only VI  I have in "Pixel manipulation" is "IMAQ imagetoarray " ....

I must say that the computer I am using is not mine, and on top of that is really old, so I might be missing some VI, or updates ...

I ll refer to my administrator, but now I am sure that my trouble was not really from me but more from a "logistic approach".

Thank you !

[Magea]

I am back ! 

I installed the full version of Vision control for my computer.

I now have the VI you were talking about.

I must say that I am surprised, beacuse it ask a mandatory "image input", and not only the array input.

WHat is it for ? I do not understand why it requieres an image, as I am providing one from my array's data.

Should I use the "IMAQ create" VI ?

[Sam_Sharp · Accepted solution]

I think it is just a reference to the image (i.e. like passing in a blank canvas). For example, I think you could re-use your IMAQ image coming in - it might be done like that for performance reasons, or because it sets up things like the image size / canvas. It isn't explained very well in the documentation but if you look at some of the built-in IMAQ examples it might help.