Art, design, and Raspberry Pi: A face tracking painting #piday #raspberrypi @Raspberry_Pi
Check out this great project from Pierre posted on Think RPI.
This painting was exhibited in Berlin during Pictoplasma 2014 Festival.
Eyes are following visitors (if many, change randomly).
It’s powered by a Raspberry Pi, C++ Code and Open CV (using Face Recognition)
Technical Stuff – Face Recognition
Software is based on Raspberry Pi and strongly inspired from my previous “OpenCV and Pi camera” posts.
For face recognition, software is very easy : it only detects faces, without recognizing people. It’s fast.
face_cascade.detectMultiScale(imageMat, faces, 1.1,3,CV_HAAR_SCALE_IMAGE,Size(80,80));
g_nVisitors = faces.size(); // number of visitors found
Once faces are detected, instructions are sent to servos to move eyes. Actually, it looks like a physical version of XEyes, for old good X11 geeks 😉
The code implements a lot of funny behaviors :
if unique visitor, follow him
if many visitors, randomly change
if a new visitor appears, focus on him
if nobody, search visitors with funny eyes moves sometimes, take a nap, close eyelids.
The tricky part was how to remember which visitor is where, frame after frame. And, when the face is lost while few seconds, be able to remember this visitor was already here (it’s not a new one, no need to focus on him/her).
Technical Stuff – Servo Control
Eyes are controlled by 2 servos (horizontal and vertical moves). Eyelid is controlled by a third servo. Thanks to ServoBlaster, control servos with Raspberry Pi is really very easy.
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Each Friday is PiDay here at Adafruit! Be sure to check out our posts, tutorials and new Raspberry Pi related products. Adafruit has the largest and best selection of Raspberry Pi accessories and all the code & tutorials to get you up and running in no time!