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1. python2.7 is installed on ubuntu
2. apt-get install python-pip
3.pip install numpy sklearn
4.apt-get install libopencv-dev
5.apt-get install libcv-dev
6.apt-get install python-opencv
7. test:
--->import cv2
--->img = cv2.imread("demo.jpg")
--->cv2.imwrite("new-demo.jpg", img)
if you get new-demo.jpg it says python+opencv ok
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8. pip install imutils
9. test usb camera
camera = cv2.VideoCapture(0)
img = camera.read()
cv2.imwrite("capture.jpg", img)