以下代码测试于ubuntu18.04下，opencv3.4.0

注意:opencv必须编译下的contrib中的freetype模块

# -*- coding:utf-8 -*-
import cv2
import numpy as np

img = np.zeros((100, 300, 3), dtype=np.uint8)

ft = cv2.freetype.createFreeType2()
# sudo apt-get install ttf-wqy-zenhei  #安装字体
ft.loadFontData(fontFileName='/usr/share/fonts/truetype/wqy/wqy-zenhei.ttc', id=0)  # 文泉驿的开源中文字体

ft.putText(img=img,
           text='你好中文',
           org=(15, 70),
           fontHeight=60,
           color=(255, 255, 255),
           thickness=-1,
           line_type=cv2.LINE_AA,
           bottomLeftOrigin=True)

cv2.imshow('freetype', img)
cv2.waitKey(0)