37648

python face detection raspberry pi with picamera

Question:

I am a newbie with python and opencv i am trying to build a face detection project with raspberry pi. i am getting this error and here is my code

Traceback (most recent call last):

File "/home/pi/Desktop/picamera-code/FaceDetection1.0", line 19, in <module> for frame in camera.capture_continuous(rawCapture, format="bgr", use_video_port=True):

Code:

import numpy as np import cv2 from picamera.array import PiRGBArray from picamera import PiCamera import time camera = PiCamera() camera.resolution = (640, 480) camera.framerate = 32 rawCapture = PiRGBArray(camera, size=(640, 480)) time.sleep(0.1) face_cascade = cv2.CascadeClassifier('/home/pi/Downloads/haarcascade_frontalface_default.xml') for frame in camera.capture_continuous(rawCapture, format="bgr", use_video_port=True): img=np.asarray(frame.array) gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY) faces = face_cascade.detectMultiScale(gray, 1.3, 5) for (x,y,w,h) in faces: img = cv2.Rectangle(img,(x,y),(x+w,y+h),(255,0,0),2) roi_gray = gray[y:y+h, x:x+w] roi_color = img[y:y+h, x:x+w] cv2.imshow('img',img) cv2.waitKey(0) cv2.destroyAllWindows()

Answer1:

The problem is in your camera.capture_continuos. First value, output, cannot be just an array as it records with an infinite iteration as the docs says. Instead of this you should put an output file. If you want an stream to capture this you can use the io.Bytes as well.

In this <a href="http://picamera.readthedocs.org/en/latest/api_camera.html/#picamera.camera.PiCamera.capture_continuous" rel="nofollow">link</a> it explains you examples on how tu use the frame and where should you redirect the output.

You can do something like what suggest on the API docs. Take the stream and truncate it to get the image that you are currently getting:

import io import time import picamera with picamera.PiCamera() as camera: stream = io.BytesIO() for foo in camera.capture_continuous(stream, format='jpeg'): # YOURS: for frame in camera.capture_continuous(stream, format="bgr", use_video_port=True): # Truncate the stream to the current position (in case # prior iterations output a longer image) stream.truncate() stream.seek(0) if process(stream): break

Answer2:

The correct answer is that you need to truncate the stream at the end of the loop. Add

rawCapture.truncate(0)

at the end of the first for loop.

Answer3:

if you change the part in line 11 640, 420 to 160, 120 it should work

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