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6. Drawing text and images

6.1. Drawing text and images

cv2.putText(img, str, origin, font, size, color, thickness)

The parameters are: image, added text, upper left corner coordinates (integer), font, font size, color, font thickness.

The font types are as follows:

6.2. Actual effect display

Source code path:

/home/pi/Rider-pi_class/4.Open Source CV/C.Image_Processing_Text_Drawing/06_Text_on_Image_Drawing.ipynb

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import cv2 
import numpy as np
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img = cv2.imread('yahboom.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 5 字体大小 6 color 7 粗细 8 line type 1 dst 2 text content 3 coordinates 4 5 font size 6 color 7 thickness 8 line type
cv2.putText(img,'Yahboom',(250,50),font,1,(200,200,0),2,cv2.LINE_AA)
# cv2.imshow('src',img)
# cv2.waitKey(0)

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import matplotlib.pyplot as plt
​
dst = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
plt.imshow(dst)
plt.show()

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import cv2 
img = cv2.imread('yahboom.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)

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img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
plt.imshow(img)
plt.show()