Opencv cv2.putText 函数详解

目录

1. 函数讲解

具体函数如下：

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

函数源码如下：

defputText(img, text, org, fontFace, fontScale, color, thickness=None, lineType=None, bottomLeftOrigin=None):# real signature unknown; restored from __doc__"""
    putText(img, text, org, fontFace, fontScale, color[, thickness[, lineType[, bottomLeftOrigin]]]) -> img
    .   @brief Draws a text string.
    .   
    .   The function cv::putText renders the specified text string in the image. Symbols that cannot be rendered
    .   using the specified font are replaced by question marks. See #getTextSize for a text rendering code
    .   example.
    .   
    .   @param img Image.
    .   @param text Text string to be drawn.
    .   @param org Bottom-left corner of the text string in the image.
    .   @param fontFace Font type, see #HersheyFonts.
    .   @param fontScale Font scale factor that is multiplied by the font-specific base size.
    .   @param color Text color.
    .   @param thickness Thickness of the lines used to draw a text.
    .   @param lineType Line type. See #LineTypes
    .   @param bottomLeftOrigin When true, the image data origin is at the bottom-left corner. Otherwise,
    .   it is at the top-left corner.
    """pass

对应的参数如下：
参数具体表述image绘制的图像text绘制的文本org文本在图像中显示的坐标，用元组表示格式为(X坐标，Y坐标)font文本字体类型，值可以为

FONT_HERSHEY_SIMPLEX

、

FONT_HERSHEY_PLAIN

fontScale字体比例因子乘以font-specific基本大小color文本颜色，设置三通道的元组，比如(255，0，0)thickness线的粗细lineType可选参数，行的类型bottomLeftOrigin可选参数，true表示数据位于原点左下角，flase位于左上角。
对应的字体类型如下：

• cv.FONT_ITALIC：斜体字的标志
• cv.FONT_HERSHEY_PLAIN：小尺寸无衬线字体
• cv.FONT_HERSHEY_SIMPLEX：正常大小的无衬线字体
• cv.FONT_HERSHEY_DUPLEX：正常大小的无衬线字体（比FONT_HERSHEY_SIMPLEX更复杂）
• cv.FONT_HERSHEY_COMPLEX：正常大小的衬线字体
• cv.FONT_HERSHEY_TRIPLEX：正常大小的衬线字体（比FONT_HERSHEY_COMPLEX更复杂）
• cv.FONT_HERSHEY_SCRIPT_SIMPLEX：手写体字体
• cv.FONT_HERSHEY_SCRIPT_COMPLEX（比FONT_HERSHEY_SCRIPT_SIMPLEX的更复杂）

2. 代码讲解

import cv2 
import matplotlib.pyplot as plt

image = cv2.imread("Gym.jpg") 
     
font = cv2.FONT_HERSHEY_SIMPLEX 
org =(100,100) 
fontScale =1
color =(255,0,0) 
thickness =3
   
image = cv2.putText(image,'manong yanjiuseng', org, font,fontScale, color, thickness, cv2.LINE_AA) 
   
plt.imshow(image)
plt.show()

截图如下：