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Face detection dengan OpenCV

http://jampasir.wordpress.com/2014/07/12/face-detection-dengan-opencv/

Saya suka sekali belajar sesuatu yang baru. Beberapa waktu yang lalu saya mulai belajar bahasa pemrograman Python. Python sangat menarik bagi saya karena dia scripting languange yang secara default sudah keinstall di OS X, jadi sewaktu waktu saya butuh simple programming, selain dengan shell script saya bisa langsung menggunakan Python. Ketertarikan saya ini berlanjut dengan mencoba menggunakan Pandas, python library/modules yang bisa kita gunakan untuk data (big atau small) analysis. Dan akhirnya, saya mencoba python untuk face detection dengan python opencv module. dengan menggunakan tutorial di sini, saya membuat simple script seperti ini:

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import numpy as np
import cv2
 
face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')
eye_cascade = cv2.CascadeClassifier('haarcascade_eye.xml')
nose_cascade = cv2.CascadeClassifier('haarcascade_mcs_nose.xml')
img = cv2.imread('ayahahmad.png')
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
 
faces = face_cascade.detectMultiScale(gray, 1.3, 5)
 
for (x, y, w, h) in faces:
    cv2.rectangle(img, (x,y), (x+w, y+h), (255, 0, 0), 2)
    roi_gray = gray[y:y+h, x:x+w]
    roi_color = img[y:y+h, x:x+w]
    eyes = eye_cascade.detectMultiScale(roi_gray)
    for (ex, ey, ew, eh) in eyes:
        cv2.rectangle(roi_color, (ex, ey), (ex+ew, ey+eh), (0, 255, 0), 2)
 
    nose = nose_cascade.detectMultiScale(roi_gray)
    for (nx, ny, nw, nh) in nose:
        cv2.rectangle(roi_color, (nx, ny), (nx+nw, ny+nh), (0, 0, 255), 2)
 
cv2.imshow('img', img)
cv2.waitKey(0)
cv2.destroyAllWindows()

disini saya mencoba medeteksi wajah, sepasang mata dan juga hidung dengan metode Haar Cascades Classifier. OpenCV sudah menyediakan training classifier dalam format xml, jadi saya tinggal menggunakannya saja sebagaimana terlihat di source code di atas. Berikut hasil eksekusi dari script tersebut: wah, ternyata mata Ahmad yang lagi menyipit tidak terdeteksi :)
kotak biru adalah bagian yang dideteksi sebagai wilayah wajah, kotak hijau adalah mata dan kotak merah adalah hidung.

Ahmad sedang sakit 3 hari ini, semoga lekas sembuh ya nak. Aamiin :’(


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