在 OpenCV 中，仅支持 Hershey 字体的一个子集。
In opencv2/core.hpp，你可以找到这个枚举 HersheyFonts。
//! Only a subset of Hershey fonts
enum HersheyFonts {
FONT_HERSHEY_SIMPLEX = 0, //!< normal size sans-serif font
FONT_HERSHEY_PLAIN = 1, //!< small size sans-serif font
FONT_HERSHEY_DUPLEX = 2, //!< normal size sans-serif font (more complex than FONT_HERSHEY_SIMPLEX)
FONT_HERSHEY_COMPLEX = 3, //!< normal size serif font
FONT_HERSHEY_TRIPLEX = 4, //!< normal size serif font (more complex than FONT_HERSHEY_COMPLEX)
FONT_HERSHEY_COMPLEX_SMALL = 5, //!< smaller version of FONT_HERSHEY_COMPLEX
FONT_HERSHEY_SCRIPT_SIMPLEX = 6, //!< hand-writing style font
FONT_HERSHEY_SCRIPT_COMPLEX = 7, //!< more complex variant of FONT_HERSHEY_SCRIPT_SIMPLEX
FONT_ITALIC = 16 //!< flag for italic font
};
如果你想使用自定义字体，你可以尝试 PIL.ImageFont。
这里提供一个基本示例：
import numpy as np
from PIL import ImageFont, ImageDraw, Image
import cv2
import time
## Make canvas and set the color
img = np.zeros((200,400,3),np.uint8)
b,g,r,a = 0,255,0,0
## Use cv2.FONT_HERSHEY_XXX to write English.
text = time.strftime("%Y/%m/%d %H:%M:%S %Z", time.localtime())
cv2.putText(img, text, (50,50), cv2.FONT_HERSHEY_SIMPLEX, 0.7, (b,g,r), 1, cv2.LINE_AA)
## Use simsum.ttc to write Chinese.
fontpath = "./simsun.ttc"
font = ImageFont.truetype(fontpath, 32)
img_pil = Image.fromarray(img)
draw = ImageDraw.Draw(img_pil)
draw.text((50, 100), "国庆节/中秋节 快乐!", font = font, fill = (b, g, r, a))
img = np.array(img_pil)
## Display
cv2.imshow("res", img);cv2.waitKey();cv2.destroyAllWindows()
cv2.imwrite("res.png", img)
