An example of using OpenCV in a Cocoa application
This is an example of using OpenCV in a Cocoa application. It is written in Objective-C++.
To build this project
To run this example, you will need to install OpenCV. You can build it from the source, but you must have CMake.
Then clone the repo:
git clone git@github.com:opencv/opencv.git
I built it in another directory which I named OpenCVBuild. And I had CMake configure/generate makefiles with the option WITH_OPENCL on (so that it will use hardware acceleration via OpenCL when possible.) Then:
cd OpenCVBuild
make
sudo make install
Then the project should build and run.
What does it do?
Click the button that says "Start Capture". Ten times per second, the web cam will capture an image. That will be converted to a one-channel image that indicates where pixels are of a certain hue. (What hue? The hues on the balls in the 6-pack of Assorted Colors Franklin Wiffle Ball Softball. Where do you get these? I bought them at Target a couple of weeks ago, but no one seems to know anything about this particular product suddenly.)
Then, the system finds contours in the one-channel image. Then it finds the smallest circle that will contain the largest contour.
Then, it draws the image and draws that minimal circle on it.