OpenCV-Python is a library of Python bindings designed to solve computer vision problems. cv2.rectangle() method is used to draw a rectangle on any image.
Syntax: cv2.rectangle(image, start_point, end_point, color, thickness)
Parameters:
image: It is the image on which rectangle is to be drawn.
start_point: It is the starting coordinates of rectangle. The coordinates are represented as tuples of two values i.e. (X coordinate value, Y coordinate value).
end_point: It is the ending coordinates of rectangle. The coordinates are represented as tuples of two values i.e. (X coordinate value, Y coordinate value).
color: It is the color of border line of rectangle to be drawn. For BGR, we pass a tuple. eg: (255, 0, 0) for blue color.
thickness: It is the thickness of the rectangle border line in px. Thickness of -1 px will fill the rectangle 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.rectangle() method # importing cv2 import cv2 # path path = r'C:\Users\Rajnish\Desktop\neveropen\Lazyroar.png' # Reading an image in default modeimage = cv2.imread(path) # Window name in which image is displayedwindow_name = 'Image' # Start coordinate, here (5, 5)# represents the top left corner of rectanglestart_point = (5, 5) # Ending coordinate, here (220, 220)# represents the bottom right corner of rectangleend_point = (220, 220) # Blue color in BGRcolor = (255, 0, 0) # Line thickness of 2 pxthickness = 2 # Using cv2.rectangle() method# Draw a rectangle with blue line borders of thickness of 2 pximage = cv2.rectangle(image, start_point, end_point, color, thickness) # Displaying the image cv2.imshow(window_name, image) |
Output:
Example #2:
Using thickness of -1 px to fill the rectangle by black color.
# Python program to explain cv2.rectangle() method # importing cv2 import cv2 # path path = r'C:\Users\Rajnish\Desktop\neveropen\Lazyroar.png' # Reading an image in grayscale modeimage = cv2.imread(path, 0) # Window name in which image is displayedwindow_name = 'Image' # Start coordinate, here (100, 50)# represents the top left corner of rectanglestart_point = (100, 50) # Ending coordinate, here (125, 80)# represents the bottom right corner of rectangleend_point = (125, 80) # Black color in BGRcolor = (0, 0, 0) # Line thickness of -1 px# Thickness of -1 will fill the entire shapethickness = -1 # Using cv2.rectangle() method# Draw a rectangle of black color of thickness -1 pximage = cv2.rectangle(image, start_point, end_point, color, thickness) # Displaying the image cv2.imshow(window_name, image) |
Output:
