FD.ipynb

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   "source": [
    "pip install opencv-python"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "c6ea292a",
   "metadata": {},
   "outputs": [],
   "source": [
    "import numpy as np"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "f4537c21",
   "metadata": {},
   "outputs": [],
   "source": [
    "import numpy as np\n",
    "import cv2\n",
    "# cascade classifier funziona solo con immagini in bianco e nero\n",
    "face_cascade = cv2.CascadeClassifier(cv2.data.haarcascades + 'haarcascade_frontalface_default.xml')\n",
    "eye_cascade = cv2.CascadeClassifier(cv2.data.haarcascades + 'haarcascade_eye.xml')\n",
    "\n",
    "img = cv2.imread('test.jpg')\n",
    "\n",
    "# conversione B and W\n",
    "gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)\n",
    "\n",
    "# 1.1 significa ridurre la finestra di un 10% ad ogni iterazione, meno riduci più preciso ma più lento\n",
    "faces = face_cascade.detectMultiScale(gray, 1.1, 5)\n",
    "#faces = face_cascade.detectMultiScale(gray)\n",
    "\n",
    "# x,y sono i punti di origine della finestra, w,h invece sono altezza e larghezza della finestra\n",
    "for (x,y,w,h) in faces:\n",
    "    # disegna il rettangolo per ogni finestra trovata\n",
    "    cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,0),2)\n",
    "    roi_gray = gray[y:y+h, x:x+w]\n",
    "    roi_color = img[y:y+h, x:x+w]\n",
    "    eyes = eye_cascade.detectMultiScale(roi_gray)\n",
    "    for (ex,ey,ew,eh) in eyes:\n",
    "        cv2.rectangle(roi_color,(ex,ey),(ex+ew,ey+eh),(0,255,0),2)\n",
    "\n",
    "cv2.imshow('img',img)\n",
    "\n",
    "cv2.waitKey(0)\n",
    "#k = cv2.waitKey(0)\n",
    "# if k == 27:         # wait for ESC key to exit\n",
    "cv2.destroyAllWindows()\n",
    "# elif k == ord('s'): # wait for 's' key to save and exit\n",
    "    # cv2.imwrite('messigray.png',img)\n",
    "    # cv2.destroyAllWindows()"
   ]
  },
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   "cell_type": "code",
   "execution_count": null,
   "id": "ce1ec485",
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   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "60922ebe",
   "metadata": {},
   "outputs": [],
   "source": []
  }
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