生成一张白色图片的算法--逻辑

　　

先生成一张黑色图，再用白色填充  

 

 

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import numpy as np import cv2  #create a black use numpy,size is:512*512 img = np.zeros((512,512,3), np.uint8)   #fill the image with white img.fill(255) ########################################### ####Main Function                      #### #draw #        start x  y end x    y      color cv2.line(img, (10,50), (511, 511), (255,0,0), 5) cv2.rectangle(img, (384,0), (510, 128), (0, 255, 0), 3) cv2.circle(img, (447, 63), 63, (0,0,255), -1) cv2.ellipse(img, (256,256), (100,50),45,0,290,(0,0,255),-1) font = cv2.FONT_HERSHEY_SIMPLEX  cv2.putText(img, 'Hello', (10,500), font, 4, (255,2,255), 2)  cv2.imshow('image', img)  cv2.waitKey(0)  cv2.destroyAllWindows()

　　

 

中文字符

 

import cv2
from PIL import Image, ImageDraw, ImageFont
import numpy as np

frame = np.zeros((512, 512, 3), np.uint8)
pil_img = Image.fromarray(cv2.cvtColor(frame, cv2.COLOR_BGR2RGB))  # 转化为pil 图片
draw = ImageDraw.Draw(pil_img)
font = ImageFont.truetype('simhei.ttf', 20, encoding="utf-8")
draw.text((50, 200), "中文字符ABC", (0, 0, 255), font)
frame = cv2.cvtColor(np.array(pil_img), cv2.COLOR_RGB2BGR)  # 转化为cv2 image
cv2.imwrite('my{}.jpg'.format(int(time.time())), frame)
os._exit(4232)