[Pyhon]人臉偵測

今天剛好有個需求需要偵測照片中的臉部，然後將臉部切割出來，後續可以做人臉比對(臉部偵測)應用，這方面技術可以採用opencv等作法，算是蠻成熟的一個應用，在這邊採用python作法．

其實最著名的做法是採用dlib C++這個套件來應用，可以在很機器學習或深度學習引用此套件，他透過LFW人臉數據進行機器學習與深度學習，所以若只是單抓人臉應該還蠻準確的．

而Python中有個face-recognition套件就將此應用集合起來．

話不多說來安裝吧！

Step1. 安裝

pip install face_recognition

安裝過程中有出現錯誤，類似

CMake must be installed to build the following extensions: dlib

基本上就是因為會引用到dlib套件，我是試圖直接安裝dlib，發現會有問題，後來發現他又引用了其它套件，所以要先安裝cmake(要根據訊息來安裝相關套件)，我是安裝以下即可．

pip install cmake

Step2. 準備一張有多人的圖片(節錄至攝圖網)

多人合照

Step3. 寫一段程式，分割臉部(採用官方教學)

from PIL import Image
  2 import face_recognition
  3
  4 # Load the jpg file into a numpy array
  5 image = face_recognition.load_image_file("photoname.jpg")
  6
  7 # Find all the faces in the image using the default HOG-based model.
  8 # This method is fairly accurate, but not as accurate as the CNN model and not GPU accelerated.
  9 # See also: find_faces_in_picture_cnn.py
 10 face_locations = face_recognition.face_locations(image)
 11
 12 print("I found {} face(s) in this photograph.".format(len(face_locations)))
 13
 14 for face_location in face_locations:
 15
 16     # Print the location of each face in this image
 17     top, right, bottom, left = face_location
 18     print("A face is located at pixel location Top: {}, Left: {}, Bottom: {}, Right: {}".format(top, left, bottom, right))
 19
 20     # You can access the actual face itself like this:
 21     face_image = image[top:bottom, left:right]
 22     pil_image = Image.fromarray(face_image)
 23     pil_image.show()

Step4. 什麼！已經完成了，看結果吧！

分割臉部影像

未完待續…其實他也可以進行人臉比對，有機會再跟各位分享！