opencv 简单图形绘制(线段，圆，矩阵)和图片上添加信息

缺乏、安全感 2021-11-17 13:52 158阅读 0赞

1，绘制线段：

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 width(线宽)
    cv2.line(dst,(100,200),(400,200),(0,255,255),20)
    # 6 line type
    cv2.line(dst,(100,300),(400,300),(0,255,0),20,cv2.LINE_AA)
    
    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)

运行结果如下：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMDA4MzI1_size_16_color_FFFFFF_t_70][]

2，矩阵圆的绘制：

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 5 fill -1 >0 line w
    cv2.rectangle(dst,(50,100),(200,300),(255,0,0),5)
    # 2 center 3 r 
    cv2.circle(dst,(250,250),(50),(0,255,0),2)
    # 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)
    
    points = np.array([[150,50],[140,140],[200,170],[250,250],[150,50]],np.int32)
    print(points.shape)
    points = points.reshape((-1,1,2))
    print(points.shape)
    cv2.polylines(dst,[points],True,(0,255,255))
    cv2.imshow('dst',dst)
    cv2.waitKey(0)

运行结果如下：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMDA4MzI1_size_16_color_FFFFFF_t_70 1][]

3,图片上添加汉字等信息：

import cv2 
    import numpy as np
    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 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)

运行结果如下：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMDA4MzI1_size_16_color_FFFFFF_t_70 2][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMDA4MzI1_size_16_color_FFFFFF_t_70]: /images/20211116/076f04da58254a4cbf1831c20ab93f7c.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMDA4MzI1_size_16_color_FFFFFF_t_70 1]: /images/20211116/d902a58c544d4843a46bc0d6790a1031.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMDA4MzI1_size_16_color_FFFFFF_t_70 2]: /images/20211116/b964306adb934ff5af127089ee35fc1b.png