RPi : 顔画像の自動収集

 

pi@raspberrypi:~ $ git clone https://github.com/sey323/hello_ghome
Cloning into ‘hello_ghome’…
remote: Enumerating objects: 23, done.
remote: Total 23 (delta 0), reused 0 (delta 0), pack-reused 23
Unpacking objects: 100% (23/23), done.
pi@raspberrypi:~ $
pi@raspberrypi:~ $ cd hello_ghome/
pi@raspberrypi:~/hello_ghome $

顔画像の収集

OpenCVには顔認識用のライブラリがあらかじめ用意されており，そちらを利用するだけで簡単に顔画像を収集できる．

それを利用してWebカメラから撮影した画像から，顔領域で切り抜きを行い，保存をするプログラムを作成し画像を収集した．

コード実行してみる

pi@raspberrypi:~/hello_ghome $ mkdir img
pi@raspberrypi:~/hello_ghome $ python3 face_camera/camera.py img/
Traceback (most recent call last):
  File “face_camera/camera.py”, line 38, in <module>
    main(save_path)
  File “face_camera/camera.py”, line 26, in main
    camera_facedetect(save_path)
  File “face_camera/camera.py”, line 16, in camera_facedetect
    face_list = detector.face_detect( image )
  File “/home/pi/hello_ghome/face_camera/detector.py”, line 18, in face_detect
    facerect = cascade.detectMultiScale(image_gray, scaleFactor=1.2, minNeighbors=2, minSize=(10, 10))
cv2.error: OpenCV(4.1.1) /home/pi/opencv-python/opencv/modules/objdetect/src/cascadedetect.cpp:1689: error: (-215:Assertion failed) !empty() in function ‘detectMultiScale’
エラーに出会いました！！！

* 原因

調べてみたら、カスケードファイルのパスが異なることで起こっているエラーのようです。

* 解決策

pi@raspberrypi:~/hello_ghome $ vi face_camera/detector.py
プログラムに、haarcascadeファイル場所をみる、ありませんね。
pi@raspberrypi:~/hello_ghome $ ll /usr/local/share/OpenCV/haarcascades/haarcascade_frontalface_alt.xml
ls: cannot access ‘/usr/local/share/OpenCV/haarcascades/haarcascade_frontalface_alt.xml’: No such file or directory

haarcascadeファイルの場所を確認。

pi@raspberrypi:~/hello_ghome $ locate haarcas
/usr/local/lib/python3.7/dist-packages/cv2/data/haarcascade_eye.xml
/usr/local/lib/python3.7/dist-packages/cv2/data/haarcascade_eye_tree_eyeglasses.xml
/usr/local/lib/python3.7/dist-packages/cv2/data/haarcascade_frontalcatface.xml
/usr/local/lib/python3.7/dist-packages/cv2/data/haarcascade_frontalcatface_extended.xml
/usr/local/lib/python3.7/dist-packages/cv2/data/haarcascade_frontalface_alt.xml
/usr/local/lib/python3.7/dist-packages/cv2/data/haarcascade_frontalface_alt2.xml
/usr/local/lib/python3.7/dist-packages/cv2/data/haarcascade_frontalface_alt_tree.xml
/usr/local/lib/python3.7/dist-packages/cv2/data/haarcascade_frontalface_default.xml
/usr/local/lib/python3.7/dist-packages/cv2/data/haarcascade_fullbody.xml
/usr/local/lib/python3.7/dist-packages/cv2/data/haarcascade_lefteye_2splits.xml
/usr/local/lib/python3.7/dist-packages/cv2/data/haarcascade_licence_plate_rus_16stages.xml
/usr/local/lib/python3.7/dist-packages/cv2/data/haarcascade_lowerbody.xml
/usr/local/lib/python3.7/dist-packages/cv2/data/haarcascade_profileface.xml
/usr/local/lib/python3.7/dist-packages/cv2/data/haarcascade_righteye_2splits.xml
/usr/local/lib/python3.7/dist-packages/cv2/data/haarcascade_russian_plate_number.xml
/usr/local/lib/python3.7/dist-packages/cv2/data/haarcascade_smile.xml
/usr/local/lib/python3.7/dist-packages/cv2/data/haarcascade_upperbody.xml
/usr/share/gst-plugins-bad/1.0/opencv_haarcascades
/usr/share/gst-plugins-bad/1.0/opencv_haarcascades/fist.xml
/usr/share/gst-plugins-bad/1.0/opencv_haarcascades/palm.xml
pi@raspberrypi:~/hello_ghome $

ファイルリンクしてみる

pi@raspberrypi:~/hello_ghome $ sudo mkdir /usr/local/share/OpenCV
pi@raspberrypi:~/hello_ghome $ cd /usr/local/share/OpenCV
pi@raspberrypi:/usr/local/share/OpenCV $ sudo ln -s /usr/local/lib/python3.7/dist-packages/cv2/data haarcascades
pi@raspberrypi:/usr/local/share/OpenCV $ ll
total 0
lrwxrwxrwx 1 root root 47 Jul 3 00:26 haarcascades -> /usr/local/lib/python3.7/dist-packages/cv2/data

再度, 同じコマンドでファイル確認できた。

pi@raspberrypi:/usr/local/share/OpenCV $ ll /usr/local/share/OpenCV/haarcascades/haarcascade_frontalface_alt.xml
-rw-r–r– 1 root staff 676709 Jul 2 15:37 /usr/local/share/OpenCV/haarcascades/haarcascade_frontalface_alt.xml

再度Webカメラから撮影した画像から，顔領域で切り抜きのコードを実行
pi@raspberrypi:~/hello_ghome $ python3 face_camera/camera.py img/
img//2020-07-03-003242_0.jpgis clip and saved!
img//2020-07-03-003243_0.jpgis clip and saved!
img//2020-07-03-003243_0.jpgis clip and saved!
img//2020-07-03-003243_0.jpgis clip and saved!
img//2020-07-03-003243_0.jpgis clip and saved!
img//2020-07-03-003243_0.jpgis clip and saved!
img//2020-07-03-003243_0.jpgis clip and saved!
img//2020-07-03-003243_0.jpgis clip and saved!
img//2020-07-03-003244_0.jpgis clip and saved!
img//2020-07-03-003244_0.jpgis clip and saved!
img//2020-07-03-003244_0.jpgis clip and saved!
img//2020-07-03-003244_0.jpgis clip and saved!
img//2020-07-03-003244_0.jpgis clip and saved!
img//2020-07-03-003244_0.jpgis clip and saved!
img//2020-07-03-003244_0.jpgis clip and saved!
img//2020-07-03-003245_0.jpgis clip and saved!
img//2020-07-03-003245_0.jpgis clip and saved!
img//2020-07-03-003248_0.jpgis clip and saved!
顔検出するたび、保存できた。

参考

RaspberryPi＋GoogleHome+Webカメラで顔認識でお出迎えしてくれるGoogleHomeを構築する

Filed under: Python ML＠ RPi - @ 6:19 pm