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OpenCV is an open source computer vision tool kit.

OpenCV Accessors

Cape Code and OpenCV

The Cape Code Host as $PTII/org/ptolemy/opencv

Cape Code OpenCV Demo

$PTII/org/terraswarm/accessor/demo/OccupancyLights/OccupancyLights.xml contains a demo that uses Ptolemy II actors and Accessors.

However, this demo will not work in the Browser or in Node. The FaceRecognizer actor is a Ptolemy actor that uses Java and C/C++, not JavaScript.

Browser Host and OpenCV

Alex Veidenbaum <> is working on porting OpenCV to JavaScript, see

Node Host and OpenCV

There is a nice demo at

The demo uses node and opencv to do face detection.

There are some caveats:

1) the opencv npm module uses OpenCV 2.x, which is out of date

2) I had various problems installing under Mac OS X because I have mac port and homebrew installed. The error messages are not helpful.

Running npm install opencv resulted in

npm ERR! errno 1
npm ERR! opencv@6.0.0 install: `node-pre-gyp install --fallback-to-build`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the opencv@6.0.0 install script 'node-pre-gyp install --fallback-to-build'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the opencv package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     node-pre-gyp install --fallback-to-build
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs opencv
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls opencv
npm ERR! There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/cxh/.npm/_logs/2017-04-17T19_14_52_332Z-debug.log

See MAC OSX 10.11.6 error #441, which suggests checking pkgconfig. This comment was helpful:

"Run brew ls opencv and check where opencv.pc is. Also run which pkg-config and ls -l $(which pkg-config) to figure out where pkg-config you're using is installed. You might have to export PKG_CONFIG_PATH with /usr/local/lib/pkgconfig."

I ended up doing

export PATH=/usr/local/Cellar/pkg-config/0.29.2/bin:${PATH}
brew tap homebrew/science
brew install homebrew/science/opencv
npm install opencv

Node, OpenCV and RHEL

Under RHEL, I believe it was necessary to install OpenCV first with:

yum install opencv-devel.x86_64

and then:

export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
npm install opencv
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Page last modified on April 18, 2017, at 09:22 PM