Simple OpenCV setup and rectangle detection
Move the Rectangle class in the lib/ folder
Keyboard detection: done;
Show GUI in real time
Don't save image to local file
Change some variables to make the image smoother
Remember position of piano when it vanishes

This makes moving keyboards much smoother
Another attempt at stabilising the image
Final adjustement to canny parameters
First pass at finger detection.

Finger has to be red-colored to be detected. This code assumed the
fingertip is bright red.