OpenCV-Python是旨在解决计算机视觉问题的Python绑定库。cv2.rectangle()方法用于在任何图像上绘制矩形。
用法： cv2.rectangle(image, start_point, end_point, color, thickness)
参数：
image:它是要在其上绘制矩形的图像。
start_point：它是矩形的起始坐标。坐标表示为两个值的元组，即(X坐标值，Y坐标值)。
end_point：它是矩形的结束坐标。坐标表示为两个值的元组，即(X坐标值ÿ坐标值)。
color:它是要绘制的矩形的边界线的颜色。对于BGR，我们通过一个元组。例如：(255，0，0)为蓝色。
thickness:它是矩形边框线的粗细像素。厚度-1像素将以指定的颜色填充矩形形状。
返回值：它返回一个图像。
用于以下所有示例的图像：
示例1:
# Python program to explain cv2.rectangle() 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'
# 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)
输出：
示例2:
使用-1 px的厚度用黑色填充矩形。
# Python program to explain cv2.rectangle() method
# importing cv2
import cv2
# path
path = r'C:\Users\Rajnish\Desktop\geeksforgeeks\geeks.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)
输出：
