一、线段绘制

import cv2
import numpy as np

newImageInfo = (500, 500, 3)
dst = np.zeros(newImageInfo, np.uint8)
# line
# 绘制线段 1 dst 2 begin 3 end 4 color
cv2.line(dst, (100, 100), (400, 400), (0, 0, 255))
# 5 line w，线条宽度
cv2.line(dst, (100, 200), (400, 200), (0, 255, 255), 20)
# 6 line type，线条类型，LINE_AA圆角更光滑
cv2.line(dst, (100, 300), (400, 300), (0, 255, 0), 20, cv2.LINE_AA)

# 绘制三角形
cv2.line(dst, (200, 150), (50, 250), (25, 100, 255))
cv2.line(dst, (50, 250), (400, 380), (25, 100, 255))
cv2.line(dst, (400, 380), (200, 150), (25, 100, 255))

cv2.imshow('dst', dst)
cv2.waitKey(0)

二、矩形圆形绘制

import cv2
import numpy as np

newImageInfo = (500, 500, 3)
dst = np.zeros(newImageInfo, np.uint8)
#  1 2 左上角 3 右下角 4 参数5 fill -1代表填充， >0代表宽度 line w
cv2.rectangle(dst, (50, 100), (200, 300), (255, 0, 0), 5)  # 矩形
# 2 center 3 r
cv2.circle(dst, (250, 250), 50, (0, 255, 0), 2)  # 圆形
# 2 center 3 轴 4 angle 5 begin 6 end 7
cv2.ellipse(dst, (256, 256), (150, 100), 0, 0, 180, (255, 255, 0), -1)  # 椭圆

points = np.array([[150, 50], [140, 140], [200, 170], [250, 250], [150, 50]], np.int32)  # 任意多边形
print(points.shape)
points = points.reshape((-1, 1, 2))  # 矩阵转换
print(points.shape)
cv2.polylines(dst, [points], True, (0, 255, 255))
cv2.imshow('dst', dst)
cv2.waitKey(0)

三、文字图片绘制

1 - 文字绘制

import cv2

img = cv2.imread('image0.jpg', 1)
font = cv2.FONT_HERSHEY_SIMPLEX
cv2.rectangle(img, (200, 100), (500, 400), (0, 255, 0), 3)
# 1 dst，2 文字内容，3 坐标，4 字体，5 字体大小，6 color，7 粗细，8 line type
cv2.putText(img, 'this is flow', (100, 300), font, 1, (200, 100, 255), 2, cv2.LINE_AA)
cv2.imshow('src', img)
cv2.waitKey(0)

2 - 图片绘制

import cv2

img = cv2.imread('image0.jpg', 1)
height = int(img.shape[0] * 0.2)
width = int(img.shape[1] * 0.2)
imgResize = cv2.resize(img, (width, height))
for i in range(0, height):
    for j in range(0, width):
        img[i + 200, j + 350] = imgResize[i, j]
cv2.imshow('src', img)
cv2.waitKey(0)