Python OpenCV | cv2.putText() 方法

OpenCV-Python是一个Python绑定库，旨在解决计算机视觉问题。 cv2.putText()方法用于在任何图像上绘制文本字符串。

Syntax: cv2.putText(image, text, org, font, fontScale, color[, thickness[, lineType[, bottomLeftOrigin]]])

Parameters:
image: It is the image on which text is to be drawn.
text: Text string to be drawn.
org: It is the coordinates of the bottom-left corner of the text string in the image. The coordinates are represented as tuples of two values i.e. (X coordinate value, Y coordinate value).
font: It denotes the font type. Some of font types are FONT_HERSHEY_SIMPLEX, FONT_HERSHEY_PLAIN, , etc.
fontScale: Font scale factor that is multiplied by the font-specific base size.
color: It is the color of text string to be drawn. For BGR, we pass a tuple. eg: (255, 0, 0) for blue color.
thickness: It is the thickness of the line in px.
lineType: This is an optional parameter.It gives the type of the line to be used.
bottomLeftOrigin: This is an optional parameter. When it is true, the image data origin is at the bottom-left corner. Otherwise, it is at the top-left corner.

Return Value: It returns an image.

用于以下所有示例的图像：

示例 #1：

# Python program to explain cv2.putText() 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'
  
# font
font = cv2.FONT_HERSHEY_SIMPLEX
  
# org
org = (50, 50)
  
# fontScale
fontScale = 1
   
# Blue color in BGR
color = (255, 0, 0)
  
# Line thickness of 2 px
thickness = 2
   
# Using cv2.putText() method
image = cv2.putText(image, 'OpenCV', org, font, 
                   fontScale, color, thickness, cv2.LINE_AA)
   
# Displaying the image
cv2.imshow(window_name, image) 

示例 #2：

# Python program to explain cv2.putText() 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'
  
# text
text = 'GeeksforGeeks'
  
# font
font = cv2.FONT_HERSHEY_SIMPLEX
  
# org
org = (00, 185)
  
# fontScale
fontScale = 1
   
# Red color in BGR
color = (0, 0, 255)
  
# Line thickness of 2 px
thickness = 2
   
# Using cv2.putText() method
image = cv2.putText(image, text, org, font, fontScale, 
                 color, thickness, cv2.LINE_AA, False)
  
# Using cv2.putText() method
image = cv2.putText(image, text, org, font, fontScale,
                  color, thickness, cv2.LINE_AA, True) 
  
# Displaying the image
cv2.imshow(window_name, image) 

输出：