Resolution: argument 'radius' is required to be an integer

cv2.error: OpenCV(3.4.14) :-1: error: (-5:Bad argument) in function 'circle' 
> Overload resolution failed: 
> - Argument 'radius' is required to be an integer 
> - Argument 'radius' is required to be an integer

Problem description ： stay opencv Programming , Drawing a circle is wrong , The code is

cv2.circle(image, (x + w/2, y + w/2), w/2, (152, 251, 152), 1) #  Draw a circle 

In the above code block w/2 As the radius of

reason ： An integer divided by 2 There may be a decimal point , Half a pixel cannot be processed , Must be r Convert to an integer int type .

Solution ：

take w/2 Change to integer ：：

r = math.ceil(w/2)

Code meaning ：Math.ceil()  “ Rounding up ”, That is, the decimal part is directly rounded off , And go to the positive part 1

Case study ： math.ceil(3.1415926) The result is 4

Tips ： need

import math