OpenCV: Dibujar gráficos usando python-cv2

1. Dibuja un segmento de línea

cv2.line(img, pt1, pt2, color, thickness, lineType):

-img: 目标图像
-pt1: 起点
-pt2: 终点
-color: 绘制的颜色
-thickness: 线段宽度
-lineType: 线段类型

import cv2
import numpy as np
newImageInfo = (200,200,3)
dat = np.zeros(newImageInfo, np.uint8)
# 绘制线段 1.目标图像 2.begin 3.end 4.color
cv2.line(dat, (0,0), (200, 200), (0,,255))
cv2.line(dat, (50, 100), (150, 100), (0,255,255), 20)
cv2.imshow('dat', dat)
cv2.waitKey(0)

2. Dibuja rectángulos, círculos y elipses.

cv2.rectangle(img, pt1, pt2, color,thickness,lineType)

cv2.circle(img, center, radius, color,thickness,lineType

cv2.ellipse(mg, center, axes, angle, startAngle, endAngle, color,thickness,lineType)

cv2.ellipse?

import cv2
import numpy as np
newImageInfo = (200,200,3)
dat = np.zeros(newImageInfo, np.uint8)
# -1表示填充
cv2.rectangle(dat, (50,50), (150, 150), (0, 255, 0), -1) 
# 2.center 3 半径 4 color 
cv2.circle(dat, (100,100), (25), (0,0,255),2)
# 1.图像 2 圆心 3 轴 4 角度 5 起始角度 6 终止角度 7 颜色 8宽度
cv2.ellipse(dat,(100,100), (50,25),0,0,360,(255,0,0),2)
cv2.imshow('dat', dat)
cv2.waitKey(0)

3. Dibuja cualquier polígono

cv2.polylines(img, pts, isClosed, color,thickness,lineType)

import cv2
import numpy as np
newImageInfo = (200,200,3)
dat = np.zeros(newImageInfo, np.uint8)

points = np.array([[25,25], [50, 25], [25, 75], [150, 175], [100, 75]], np.int32)
points = points.reshape((-1, 1, 2))
cv2.polylines(dat, [points], True, (0,255,255))
cv2.imshow('dat', dat)
cv2.waitKey(0)

4. Dibujo de imagen de texto

Dibujar texto

cv2.putText(img, text, org, fontFace, fontScale, color,thickness,lineType)

import cv2
import numpy as np
img = cv2.imread('img.jpg', 1)
font = cv2.FONT_HERSHEY_SIMPLEX

#2 text 3 坐标起点 4 字体类型 5 字体大小 6 颜色 7粗细 8 linetype
cv2.putText(img,"this is flower",(100, 160), font, 1, (200,100,255),2,cv2.LINE_AA)
cv2.imshow('img', img)
cv2.waitKey(0)

Hacer dibujos

import cv2
import numpy as np
img = cv2.imread('img.jpg', 1)
height = int(img.shape[0] * 0.3)
width = int(img.shape[1] * 0.3)
imgResize = cv2.resize(img, (width, height))
for i in range(height):
    for j in range(width):
        img[i + 125, j + 125] = imgResize[i, j]
cv2.imshow('img', img)
cv2.waitKey(0)