Created
July 11, 2014 08:01
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Motion detection using a webcam, Python, OpenCV and Differential Images
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| #!/usr/bin/env python | |
| """ | |
| Found on | |
| http://www.steinm.com/blog/motion-detection-webcam-python-opencv-differential-images/ | |
| """ | |
| import cv2 | |
| def diffImg(t0, t1, t2): | |
| d1 = cv2.absdiff(t2, t1) | |
| d2 = cv2.absdiff(t1, t0) | |
| return cv2.bitwise_and(d1, d2) | |
| cam = cv2.VideoCapture(0) | |
| winName = "Movement Indicator" | |
| cv2.namedWindow(winName, cv2.CV_WINDOW_AUTOSIZE) | |
| # Read three images first: | |
| t_minus = cv2.cvtColor(cam.read()[1], cv2.COLOR_RGB2GRAY) | |
| t = cv2.cvtColor(cam.read()[1], cv2.COLOR_RGB2GRAY) | |
| t_plus = cv2.cvtColor(cam.read()[1], cv2.COLOR_RGB2GRAY) | |
| while True: | |
| cv2.imshow( winName, diffImg(t_minus, t, t_plus) ) | |
| # Read next image | |
| t_minus = t | |
| t = t_plus | |
| t_plus = cv2.cvtColor(cam.read()[1], cv2.COLOR_RGB2GRAY) | |
| key = cv2.waitKey(10) | |
| if key == 27: | |
| cv2.destroyWindow(winName) | |
| break | |
| print("Goodbye") |
I am having the same error, could you solve it ?
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OpenCV Error: Assertion failed (scn == 3 || scn == 4) in cvtColor, file /io/opencv/modules/imgproc/src/color.cpp, line 10638
Traceback (most recent call last):
File "MD.py", line 15, in
t_minus = cv2.cvtColor(cam.read()[1], cv2.COLOR_RGB2GRAY)
cv2.error: /io/opencv/modules/imgproc/src/color.cpp:10638: error: (-215) scn == 3 || scn == 4 in function cvtColor
it shows the error ? what should i do ?