Python OpenCV | cv2.circle() method
OpenCV-Python is a library of Python bindings designed to solve computer vision problems. cv2.circle() method is used to draw a circle on any image.
Syntax: cv2.circle(image, center_coordinates, radius, color, thickness)
Parameters:
image: It is the image on which circle is to be drawn.
center_coordinates: It is the center coordinates of circle. The coordinates are represented as tuples of two values i.e. (X coordinate value, Y coordinate value).
radius: It is the radius of circle.
color: It is the color of border line of circle to be drawn. For BGR, we pass a tuple. eg: (255, 0, 0) for blue color.
thickness: It is the thickness of the circle border line in px. Thickness of -1 px will fill the circle shape by the specified color.
Return Value: It returns an image.
Image used for all the below examples:
Example #1:
# Python program to explain cv2.circle() method # importing cv2 import cv2 # path path = r 'C:\Users\Rajnish\Desktop\geeksforgeeks\geeks.png' # Reading an image in default mode image = cv2.imread(path) # Window name in which image is displayed window_name = 'Image' # Center coordinates center_coordinates = ( 120 , 50 ) # Radius of circle radius = 20 # Blue color in BGR color = ( 255 , 0 , 0 ) # Line thickness of 2 px thickness = 2 # Using cv2.circle() method # Draw a circle with blue line borders of thickness of 2 px image = cv2.circle(image, center_coordinates, radius, color, thickness) # Displaying the image cv2.imshow(window_name, image) |
Output:
Example #2:
Using thickness of -1 px to fill the circle by red color.
# Python program to explain cv2.circle() method # importing cv2 import cv2 # path path = r 'C:\Users\Rajnish\Desktop\geeksforgeeks\geeks.png' # Reading an image in default mode image = cv2.imread(path) # Window name in which image is displayed window_name = 'Image' # Center coordinates center_coordinates = ( 120 , 100 ) # Radius of circle radius = 30 # Red color in BGR color = ( 0 , 0 , 255 ) # Line thickness of -1 px thickness = - 1 # Using cv2.circle() method # Draw a circle of red color of thickness -1 px image = cv2.circle(image, center_coordinates, radius, color, thickness) # Displaying the image cv2.imshow(window_name, image) |
Output:
Last Updated on October 28, 2021 by admin