in the example,what does pt[0] and pt[1] mean??
for pt in zip(*loc[::-1]):
cv2.rectangle(img, pt, (pt[0] + w, pt[1] + h), (0,0,255), 2)
counter=counter+1
Umm...I guess it means initial point in the picture,but how do program know the initial point should be?
Can anyone help me to answer my question? Thank you in advance.
I assume you got the code from here
The result from zip(*loc[::-1]) is a tuple that is stored in pt. At this point, pt has the structure (x, y) and p[0] == x and p[1] == y.
Now, let's take a turn and look at OpenCV documentation of cv2.rectangle(). You will see that the third and fourth arguments are of type Point. A peek into Point shows that its attributes are x,y. In Python, this type definition is encapsulated into a tuple since data type declaration is not a thing.
I think this is enough for you to put two and two together and understand exactly what that drawing function does.
Happy coding, Cheers mate :)
Asked: 2018-05-24 12:28:50 -0600
Seen: 998 times
Last updated: May 24 '18
link to the example ?