OpenCV使用命令行参数输入图像（Python）

Question

I am trying to load an image from a file specified on the command line then process it using the OpenCV command HoughCircles. What happens is that I am opening the file:

img = cv2.imread(argv[0],0)

Then trying to use the following function:

def _getCircles(img):
  _circles = cv2.HoughCircles(img,cv2.cv.CV_HOUGH_GRADIENT,1,20,param1=50,param2=30,minRadius=1,maxRadius=20)

But returns the error:

cv2.error: error: (-206) Unrecognized or unsupported array type in function cvGetMat

However if I load the file directly ie change argv[0] to the explicit filename everything works perfectly. Any ideas?

Answer 1

In python and most other languages argv[0] contains the program name. Try using argv[1] to get the correct result.

Here is some Python Documentation to help you. Python has an amazing library of documentation I highly recommend using it.