IMAQ USB camera->black screen

[hlod]

I use "vision"module for labview; and try to snap a picture from usb camera; I can normally use "grab", picture is shown; but what I need is picture, so I use "snap", but there is just "black screen" on camera(usb logitech).

any advice on this?

thanks

[PrimaryKey]

Hi hlod,

your problem is usually related to poor lighting conditions with short exposition time. Please check those two parameters and see if changing them influences your picture. You can also check the aperture of your camera if there is an option to change it. 

Please also post the code that you are using. Maybe using the code from the examples in LabVIEW is going to solve your problem, so please try to do that as well.

Best regards, Piotr

[hlod]

Well camera is grabing picture(when I use IMAQ dx grab), but I can't "snap" picture, just black screen( see code)-picture. Camera is USB logitech quickcam.

[PrimaryKey]

Hi hlod, please try to connect your image indicator to Image Out output on the Snap function.

Hope that clears things up.

[Silver_Shaper]

As for as my opinion normally USB camera take little time to expose. Try to add wait (ms) function, initialize 5 to 10 sec delay and check.

[Silver_Shaper]

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@sac. wrote:

As for as my opinion normally USB camera take little time to expose. Try to add wait (ms) function, initialize 5 to 10 sec delay and check.

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Yes you try like this.. if not change delay time.

[hlod]

Try this, same "black picture" 😕

[hlod]

I try also with delay (5-10ms), now it's not taking any picture(not "black screen")

[Silver_Shaper]

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@hlod wrote:

I try also with delay (5-10ms), now it's not taking any picture(not "black screen")

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what about image type in imaq create function?

[Zekasa]

hi,

hi did you try to change the name of the image in the "IMAQ Create" vi