I'm trying and failing to make opencv_traincascade use multiple threads. The only documentation I can find says to "build OpenCV with TBB". I'm not sure if I'm failing to successfully build OpenCV with TBB, or whether there's some flag I need to set for opencv_traincascade.
I've downloaded the OpenCV version 2.3.1 windows superpack and tbb40_20111003oss_win.zip, which I extracted to C:\tbb40_20111003oss. I then generated VC8 .sln and .proj files using CMake, setting
WITH_TBB: ON
TBB_INCLUDE_DIR:PATH=C:\tbb40_20111003oss\include
TBB_LIB_DIR:PATH=C:/tbb40_20111003oss/lib/intel64/vc8
OpenCV then builds without errors, but when I run opencv_traincascade it's singlethreaded. Does anyone know what I'm doing wrong?
Answer
If you are on Mac you can do this with homebrew:
brew tap homebrew/science
brew install opencv --with-tbb
Or if you have already installed with homebrew:
brew uninstall opencv
brew install opencv --with-tbb
Also, the info command tells you about other flags you might be interested in, e.g. --with-java
brew info opencv