Python OpenCV cv2 imwrite

Question

I m trying to detect a face and write down area with the face in a separate file  How can I do it  I think that i must use  faces   you can see this var in code   But how   from ffnet import mlgraph  ffnet  tmlgraph  imlgraph import pylab import sys import cv cv2 import numpy cascade   cv Load  C  opencv data haarcascades haarcascade frontalface alt xml     def detect image    bitmap   cv fromarray image   faces   cv HaarDetectObjects bitmap  cascade  cv CreateMemStorage 0    if faces    for  x y w h  n in faces       cv2 rectangle image  x y   x w y h   255 255 255  3   return image  if   name         main         cam   cv2 VideoCapture 0      while 1            frame  cam read           frame   numpy asarray detect frame           cv2 imshow  features   frame          if cv2 waitKey 1     0x1b    ESC             print  ESC pressed  Exiting                  break

User · Answer

wtluo  great   May I propose a slight modification of your code 2    Here it is   for i  detected box in enumerate detect boxes       box   detected box  box       face img   img  box 1  box 1    box 3   box 0  box 0    box 2        cv2 imwrite  face-  03d  jpg  format i 1   face img

User · Answer

Alternatively  with MTCNN and OpenCV other dependencies including TensorFlow also required   you can   1 Perform face detection Input an image  output all boxes of detected faces    from mtcnn mtcnn import MTCNN import cv2  face detector   MTCNN    img   cv2 imread  Anthony Hopkins 0001 jpg   detect boxes   face detector detect faces img  print detect boxes          box    73  69  98  123    confidence   0 9996458292007446   keypoints     left eye    102  116    right eye    150  114    nose    129  142    mouth left    112  168    mouth right    146  167       2 save all detected faces to separate files   for i in range len detect boxes        box   detect boxes i   box       face img   img box 1   box 1    box 3    box 0   box 0    box 2        cv2 imwrite  face-  03d  jpg  format i 1   face img    3 or Draw rectangles of all detected faces   for box in detect boxes      box   box  box       pt1    box 0   box 1     top left     pt2    box 0    box 2   box 1    box 3     bottom right     cv2 rectangle img  pt1  pt2   0 255 0   2  cv2 imwrite  detected-boxes jpg   img

User · Answer

This following code should extract face in images and save faces on disk  def detect image       image faces          bitmap   cv fromarray image      faces   cv HaarDetectObjects bitmap  cascade  cv CreateMemStorage 0       if faces          for  x y w h  n in faces              image faces append image y  y h   x  x w                 cv2 rectangle image  x y   x w y h   255 255 255  3      return image faces  if   name         main         cam   cv2 VideoCapture 0      while 1            frame  cam read           image faces              image faces   detect frame          for i  face in enumerate image faces               cv2 imwrite  face-    str i      jpg   face            cv2 imshow  features   frame          if cv2 waitKey 1     0x1b    ESC             print  ESC pressed  Exiting                  break

[python] Python+OpenCV: cv2.imwrite

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