EmguCV on the Raspberry Pi with Mono #3

It is getting even easier to build EmguCv and OpenCV for the Raspberry Pi. Recent commits to EmguCV have added build support for Raspbian. From commit [1fa5e56] I only had to follow the EmguCV instructions with a minor tweak.

At near 100% complete compilation, there was an error

fatal error: opencv2/hal/defs.h: No such file or directory 

which I solved with

mkdir ~/emgucv/opencv/modules/core/include/opencv2/core/opencv2/hal -p

cp ~/emgucv/opencv/modules/hal/include/opencv2/hal/defs.h ~/emgucv/opencv/modules/core/include/opencv2/core/opencv2/hal

Note that EmguCV's CMAKE builds OpenCV with TBB=FALSE - disabling support for Intel's Thread Building Blocks. TBB isn't available on Raspian's ARM hard float Wheezy at the time of writing (via apt-get package management at least). I plan to get this going at some point though. Face detection in OpenCV uses the detectMultiScale method which should get a nice speed boost on the Raspberry Pi 2 when TBB is enabled.

UPDATE 20 June - Also compiles flawlessly in commit [56f898c].

Trap for new players

After switching branches and remotes around I started getting all sorts of errors like:

error: expected constructor, destructor, or type conversion before 'cveGpuMatIsContinuous'

and:

error: 'cvSampleLine' was not declared in this scope

until I realised my submodules were out of sync. It wasn't until I completely purged the repo that I realised, there must be a more elegant way to resync git submodules which I will try next time.