Can you detect rectangles with OpenCV 2.4.4?

edit

Finding the C code isn't the problem (although a big thanks for that) but I can't seem to implement it in the JNI part of the Android project. Is there a tutorial on how to do that? Cause when i copy paste the code to my .cpp file in the JNI part everything seems to be an error (even the #include parts)

So I am not experienced in programming for Android, neither coding in Java. Basically, you need to transfer the code from C/C++ to Java. Or am I wrong? This shouldn't be too difficult. Replace the #includes to imports, e.g. import org.opencv.imgproc.Imgproc and then you can use any imageproc function, e.g. ImgProc.Canny(...) , the structure of the parameters should be the same, of course some data-types are different, e.g. Lists (or ArrayList?) vs std::vector. Some examples you'll find below samples/java and if you search here in the forum or via any search-machine. The java-api you'll find at http://docs.opencv.org/java/ . Good luck!