New to Python, help with saving image from camera

[tantony]

I'm new to Python, but I decided to write a program that takes a picture of a person's face and saves it as "who.jpg". When I run this code, I'm able to see the camera and rectangles around the face, but the "who.jpg" is blank, and it's 0 kb in size. What can I do to have the "who.jpg" take picture of the face and save it? I just need to take the picture of the face one time.

import cv2 import sys cascPath = 'haarcascade_frontalface_default.xml' faceCascade = cv2.CascadeClassifier(cascPath) video_capture = cv2.VideoCapture('rtsp://ituser:[email protected]/mpeg4/media.amp') while True: # Capture frame-by-frame ret, frame = video_capture.read() gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY) faces = faceCascade.detectMultiScale( gray, scaleFactor=1.1, minNeighbors=5, minSize=(30, 30) ) # Draw a rectangle around the faces for (x, y, w, h) in faces: cv2.rectangle(frame, (x, y), (x + w, y + h), (0, 255, 0), 2) # Display the resulting frame img = cv2.imshow('Server Room', frame) cv2.imwrite("who.jpg", img) if cv2.waitKey(1) & 0xFF == ord('q'): break # When everything is done, release the capture video_capture.release() cv2.destroyAllWindows()

Thanks,

Tony

---

I guess I can't use imread for videos, and this says I need to use ffmpeg. Am I correct?

https://stackoverflow.com/questions/3726...ng-a-video

[ThomasL]

The cv2.imwrite("who.jpg", img) is inside the loop, so every img shown on the screen
is written into that filename. I don´t think that is what you want and i assume the code can´t write that fast.
In addition cv2.imwrite() returns an integer, if i´m not wrong 0 means ok, 1 means error.

Untested and only an idea:

 # Display the resulting frame img = cv2.imshow('Server Room', frame) if cv2.waitKey(1) & 0xFF == ord('q'): break if cv2.waitKey(1) & 0xFF == ord('p'): err = cv2.imwrite("who.jpg", img) print(error) break

Should save an image if you press p key and then quit.

[tantony]

I got it figured it out, and its working now! Thanks everybody for the help.

""" Importing libraries """ import cv2 import datetime import os """ Declaring variables """ cascPath = 'haarcascade_frontalface_default.xml' faceCascade = cv2.CascadeClassifier(cascPath) camera = cv2.VideoCapture('rtsp://ituser:[email protected]/mpeg4/media.amp') path = './Images' """ Do this while the camera is working """ while (camera.isOpened()): ret, frame = camera.read() gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY) faces = faceCascade.detectMultiScale( gray, scaleFactor=1.2, minNeighbors=5, minSize=(30, 30) ) for (x, y, w, h) in faces: cv2.rectangle(frame, (x, y), (x + w, y + h), (0, 255, 255), 2) date = datetime.datetime.now() date = (date.strftime("%m-%d-%Y_%H%M%S")) jpeg = date + '.jpg' cv2.imwrite(os.path.join(path,jpeg), frame) cv2.imshow('SCA Server Room', frame) if cv2.waitKey(1) & 0xFF == ord('q'): break """ Finally, release the capture and close windows """ camera.release() cv2.destroyAllWindows()