Program crashing when grabbing USB Camera frame + misc comm issues

[RufflesRidge]

Originally Posted by bob.wolff68

In the case of wanting it on the smartdashboard - that can be accomplished by adding the video pane to the smartdashboard directly. I think this is in the menus or it is a right-click on the dashboard to add it. No programming necessary.

bob

This is not true for the USB camera. You need code to forward the image.

OP, you should check to make sure that you are actually getting a non-null image of non-zero size back from your call to GetImage. If you are calling GetImage every 20ms that's 50FPS which the camera can't provide, I haven't played with this enough to know if that's why your having an issue, but it would be my first suspicion.

[FleventyFive]

Originally Posted by RufflesRidge

OP, you should check to make sure that you are actually getting a non-null image of non-zero size back from your call to GetImage. If you are calling GetImage every 20ms that's 50FPS which the camera can't provide, I haven't played with this enough to know if that's why your having an issue, but it would be my first suspicion.

This was my guess as well. How to I check if it is non-null? The WPILIB image class has no public functions or attributes at all. It's very confusing... like how can I convert between the Image returned from the USBcamera and the other wpilib image classes like ColorImage (which have public functions like thresholding or w/e)? The AxisCamera class has functions to return these other types of images, but not the USBcamera. Thanks for the help.

[Team3266Spencer]

I know that I have to power cycle the roboRIO when I upload code it can find the camera sometimes.