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camera.py
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camera.py
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# -*- coding: utf-8 -*-
"""
Created on Fri Jan 26 17:11:53 2018
@author: casal guillaume
"""
import cv2
import time
class Camera():
# Constructor...
def __init__(self):
w = 640 # Frame width...
h = 480 # Frame hight...
fps = 20.0 # Frames per second...
resolution = (w, h) # Frame size/resolution...
self.cap = cv2.VideoCapture(0) # Prepare the camera...
print("Camera warming up ...")
time.sleep(1)
# Prepare Capture
self.ret, self.frame = self.cap.read()
# Prepare output window...
self.winName = "Motion Indicator"
cv2.namedWindow(self.winName, cv2.WINDOW_AUTOSIZE)
# Read three images first...
self.prev_frame = cv2.cvtColor(self.cap.read()[1],cv2.COLOR_RGB2GRAY)
self.current_frame = cv2.cvtColor(self.cap.read()[1],cv2.COLOR_RGB2GRAY)
self.next_frame = cv2.cvtColor(self.cap.read()[1],cv2.COLOR_RGB2GRAY)
# Define the codec and create VideoWriter object
self.fourcc = cv2.VideoWriter_fourcc(*'H264') # You also can use (*'XVID')
self.out = cv2.VideoWriter('output.avi',self.fourcc, fps, (w, h), True)
# Frame generation for Browser streaming wiht Flask...
def get_frame(self):
self.frames = open("stream.jpg", 'wb+')
s, img = self.cap.read()
if s: # frame captures without errors...
cv2.imwrite("stream.jpg", img) # Save image...
return self.frames.read()
def diffImg(self, tprev, tc, tnex):
# Generate the 'difference' from the 3 captured images...
Im1 = cv2.absdiff(tnex, tc)
Im2 = cv2.absdiff(tc, tprev)
return cv2.bitwise_and(Im1, Im2)
def captureVideo(self):
# Read in a new frame...
self.ret, self.frame = self.cap.read()
# Image manipulations come here...
# This line displays the image resulting from calculating the difference between
# consecutive images...
diffe = self.diffImg(self.prev_frame, self.current_frame, self.next_frame)
cv2.imshow(self.winName,diffe)
# Put images in the right order...
self.prev_frame = self.current_frame
self.current_frame = self.next_frame
self.next_frame = cv2.cvtColor(self.frame, cv2.COLOR_RGB2GRAY)
return()
def saveVideo(self):
# Write the frame...
self.out.write(self.frame)
return()
def __del__(self):
self.cap.release()
cv2.destroyAllWindows()
self.out.release()
print("Camera disabled and all output windows closed...")
return()
def main():
# Create a camera instance...
cam1 = Camera()
while(True):
# Display the resulting frames...
cam1.captureVideo() # Live stream of video on screen...
cam1.saveVideo() # Save video to file 'output.avi'...
if cv2.waitKey(1) & 0xFF == ord('q'):
break
return()
if __name__=='__main__':
main()