Need help loading Axis Camera feed in Java

[TheModMaster8]

So I'm trying to do a little vision project and I'm stuck at how to import the live camera feed into java run on eclipse Kepler. I have OpenCV and, wpilib installed correctly. I can't get the Axis Camera "location" to work, (note I'm not using wpilib workspace at all, I made a project folder with openCV)

I have the Camera's IP set to 192.168.0.90 and it works on a web browser,
However I don't know how to initialize the camera correctly in java
Any help would be welcomed.

[pblankenbaker]

We have some Java code available on github that provides some examples of opening a video feed using the OpenCV methods.

The project can be found at:

https://github.com/frc868/2016-Vision

In particular the FrameGrabber.java class (https://github.com/frc868/2016-Vision/blob/master/src/com/techhounds/imgcv/FrameGrabber.java).


The open(String url, int devId, int width, int height) method demonstrates the OpenCV methods we use to connect to the video capture device.
The run() method within the CaptureThread class (also in FrameGrabber.java) demonstrates opening and reading in frames.


We did find that determining the correct URL for cameras was a bit tricky. For the Axis M1103 at IP 10.8.68.11, we ended up using:

http://10.8.68.11/mjpg/video.mjpg

This seemed to have lower latency than using the H264 encoding available at:

rtsp://10.8.68.11:554/axis-media/media.amp?videocodec=h264

Finally, setting up your OpenCV environment can be tricky. If the necessary libraries aren't found, you can easily find yourself in a situation where you can grab still images just fine from the camera just fine, but are unable to grab a live stream.

Hope that helps.