IMAQ extract (-1074396077), Crop Image

[MJ77]

Hi,

I have a 12 bit CCD camera (Vosskühler). I use the IMAQ vi's, to take the image from the CCD cam the IMAQ Snap.vi. The communication to the camera works fine...

I'd like to crop the "full" image, take a rectangular region of interest of this image. For this purpose I use the IMAQ Extract.vi.

Problem: when I try to crop directly the image which is coming from the camera, the IMAQ Extract.vi generates an error (-1074396077). BUT when I first save the picture on a local drive, reload it again and try to crop it then, then it works properly ! What can be the problem ?

I attached the vi which does not work...

Many thanks for your help

PS: I mean I have a solution with the save, close and reload, but I don't like this !

Cheers, Matthias

[Duffy2007]

Hello MJ77,

can you please delete the image type of the croped image, so no constant is connected?

[MJ77]

Hi Alexander,

unfortunately it also does not work ! I have deleted the constant (grayscale u16) from the croped image, but the error still occur.

In my understanding, the "depth" of the pixel (grayscale u8, u16, ...) should not affect a cropping function, but probably I'm wrong.

Do you have another idea ?

Best regards, Matthias

[Gregory]

What happens if you don't wire "Image Dst" into the IMAQ Extract VI?

[MJ77]

Hi,

if I don't wire the "Image Name" input of the "IMAQ Extract.VI" then the LabVIEW can't be executed...

if I wire "Image Dst" to the "Image Name" input --> same error...

Did I understand your answer right ?

Other ideas ?

Many thanks. Matthias

[Bob_Schor]

Remove the two IMAQ Dispose functions -- they are destroying your images (which are being built just fine, I checked) before you can see them, then when you try to manipulate non-existant images, you get an error.

Bob Schor

[Duffy2007 · Accepted solution]

Hello MJ77

attached a vi in this you can see what image type came out of the snap function and also the option to load from a file.

I get the same error like you if the image types are not the same.

[MJ77]

Thanks at all !

The problem was the data type. Although I defined U16, it was I16 returned from the camera.

LG Matthias