Updating OpenCV 3 support info

[gokhansolak]

Hello, apparently at one point OpenCV3 got support. I was able to build it with ROS Melodic / Ubuntu 18.04 and run kinect2_bridge.launch. The camera runs, I can read the camera_info, image_color etc and view it using image_view.

However, the readme still says that it won't work:

Could you please confirm that it is fully supported and update the readme accordingly?

Thank you

[Ktysai]

I have ROS Melodic and Ubuntu 18. Still in a struggle to make it work. Can you post details?

[gokhansolak]

Hi Ktysai,

I did not do anything special, besides following the installation instructions. During libfreenect2 installation, I installed the optional OpenCL and VAAPI libs. My system:

ROS-Melodic (standard setup)
Ubuntu 18.04 (everything up-to-date)
Graphics card: Intel Corporation HD Graphics 620 (rev 02)
OpenCV version: 3.2.0

Note: I only run kinect2_bridge.launch, no errors. I use bridge outputs, but I did not use any other features of this package, yet.

[Ktysai]

Thank you, @gokhansolak

I have installed all on Intel NUC i5, but OpenCL does not work.
What has helped was to run the bridge with those settingsrosrun kinect2_bridge kinect2_bridge _depth_method:=cpu _reg_method:=cpu