While executing the below code i'm getting this 'TypeError: img is not a numerical tuple'

Question

    import cv2
    ram_frames=30
    cam = cv2.VideoCapture(0)
    def get_image():
          cap = cam.read()
          return cap
    for i in xrange(ramp_frames):         


        

Answer 1

if np.any( initial == None): #your code It will definitely work for you. The error in this code because initial is treated as a numpy array.

I initialized initial with None in my program

Answer 2

You have changed the code while copying. Obviously, cam.read() returns a tuple. From the documentation:

Python: cv2.VideoCapture.read([image]) → retval, image

You are returning the whole tuple of retval and image, while the example only returns the second part of it (the image). So your image variable in line 9 contains the complete tuple that is returned by read() while the example only returns the second part of it. imwrite then fails because it does not expect a tuple as argument.

Try changing your code like this:

def get_image():
      _, cap = cam.read()
      return cap

or, even better,

def get_image():
    return cam.read()[1]

Additionally, you have misspelled the variable ramp_frames as ram_frames in line 2.