Python OpenCV cv2.rectangle () method

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OpenCV-Python — is a Python bindings library for solving computer vision problems. cv2.rectangle () 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  ( X coordinate value, Y coordinate value).
end_point: It is the ending coordinates of rectangle. The coordinates are represented as tuples of two values ( 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.

Example # 1:

# Python program to explain cv2.rectangle() method

# importing cv2
import cv2

# path
path = r’C:UsersRajnishDesktopgeeksforgeeksgeeks.png’

# Reading an image in default mode
image = cv2.imread(path)

# Window name in which image is displayed
window_name = ’Image’

# Start coordinate, here (5, 5)
# represents the top left corner of rectangle
start_point = (5, 5)

# Ending coordinate, here (220, 220)
# represents the bottom right corner of rectangle
end_point = (220, 220)

# Blue color in BGR
color = (255, 0, 0)

# Line thickness of 2 px
thickness = 2

# Using cv2.rectangle() method
# Draw a rectangle with blue line borders of thickness of 2 px
image = cv2.rectangle(image, start_point, end_point, color, thickness)

# Displaying the image
cv2.imshow(window_name, image)

Example # 2:

Using thickness -1 px to fill the rectangle with black.

# Python program to explain cv2.rectangle() method
	
# importing cv2
import cv2
	
# path
path = r’C:UsersRajnishDesktopgeeksforgeeksgeeks.png’
	
# Reading an image in grayscale mode
image = cv2.imread(path, 0)
	
# Window name in which image is displayed
window_name = ’Image’

# Start coordinate, here (100, 50)
# represents the top left corner of rectangle
start_point = (100, 50)

# Ending coordinate, here (125, 80)
# represents the bottom right corner of rectangle
end_point = (125, 80)

# Black color in BGR
color = (0, 0, 0)

# Line thickness of -1 px
# Thickness of -1 will fill the entire shape
thickness = -1

# Using cv2.rectangle() method
# Draw a rectangle of black color of thickness -1 px
image = cv2.rectangle(image, start_point, end_point, color, thickness)

# Displaying the image
cv2.imshow(window_name, image)

opencv cv2.rectangle

he cv2.rectangle function is to draw a simple rectangle on the image. The cv2.rectangle function definition given on the opencv official site is as follows:

Python: cv2.rectangle(img, pt1, pt2, color[, thickness[, lineType[, shift]]]) → None

• img – Image.
• pt1 – Vertex of the rectangle.
• pt2 – Vertex of the rectangle opposite to pt1 .
• color – Rectangle color or brightness (grayscale image).
• thickness – Thickness of lines that make up the rectangle. Negative
  values, like CV_FILLED , mean that the function has to draw a filled
  rectangle.
• lineType – Type of the line. See the line() description.
  — 8 (or omitted) - 8-connected line.
  — 4 - 4-connected line.
• —CV_AA - antialiased line.
• shift – Number of fractional bits in the point coordinates.**

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