More server issues and bad links fixed
Filed under: Frozentux.net
Several more server issues where found which in turn caused the server to DoS’ing itself with disk-io. I’m sorry for the inconvenience, personal life has taken too much time simply.
Also, based on reports from some users, I’ve fixed several bad links in the iptables-tutorial and ipsysctl-tutorial documents. This was caused by an earlier move between servers.
If you find any other issues, let me know!
Raspicam and OpenCV instructions
Filed under: Development, Hardware, Linux, Robots
I have previously gotten the opencv and python bindings to work via the 2.3 opencv system and facial recognition did work, but the system is bugged out and I could only get 64x64px image size.
I followed these instructions to get the raspicam to work with opencv and simplecv
http://tothinkornottothink.com/post/59305587476/raspberry-pi-simplecv-opencv-raspicam-csi-camera
However, there where some minor details wrong with it so here is a short list of the updates to the installation instructions on that page.
I noticed a few problems as I saw it with the above instructions, or possibly I didn’t read the instructions well enough. That said, very good info! Thank you!
Here are the issues I had:
The opencv_2.4.5.sh script pulls in libopencv-dev which in turn pulls in the entire libopencv2.3 from raspbian repositories, which in turn meant that simplecv was still using libopencv2.3.
apt-get remove libopencv-core2.3
Once that is removed, python-opencv is also removed and simplecv will not even run anymore. Adding the following will add the path to where the python cv bindings are.
export PYTHONPATH=/usr/local/lib/python2.7/site-packages/
And finally, the LD_PRELOAD to actually use the correct uv4l libraries.
export LD_PRELOAD=/usr/lib/uv4l/uv4lext/armv6l/libuv4lext.so
Once this is done, you should no longer get the munmap errors etc, and large resolution should work:
SimpleCV:1> cam = Camera(0, {“width”:640, “height”:480})
SimpleCV:2> cam.live()
etc.
Server troubles
Since the server update we’ve experienced several issues causing disruptions and downtimes. We believe that the issue causing the problems have been addressed and that webserver should resume normal operations from now on.