在图像中画点，画框

画点

from PIL import Image
from pylab import *
import cv2
import matplotlib.pyplot as plt
im = array(Image.open('E:/1.jpg'))
# im.astype(int)
plt.imshow(im)
print ('Please click 3 points')
click = plt.ginput(3, timeout = -1)
plt.close()
print ('you clicked:',click)
x = []
y = []
for a, b in click:
    a = int(a)
    b = int(b)
    cv2.circle(im, (a, b), 2, (0, 0, 255), -1)
cv2.imshow('name', im)
cv2.waitKey()
cv2.destroyAllWindows()

画框

'''
EVENT_FLAG_ALTKEY = 32        摁住Alt
EVENT_FLAG_CTRLKEY = 8        摁住Ctrl

EVENT_FLAG_LBUTTON = 1        摁住左键
EVENT_FLAG_MBUTTON = 4        摁住中键
EVENT_FLAG_RBUTTON = 2        摁住右键
EVENT_FLAG_SHIFTKEY = 16    摁住Shift

EVENT_LBUTTONDBLCLK = 7        左键双击
EVENT_LBUTTONDOWN = 1        左键击下
EVENT_LBUTTONUP = 4            左键弹起
EVENT_MBUTTONDBLCLK = 9        中键双击
EVENT_MBUTTONDOWN = 3        中键击下
EVENT_MBUTTONUP = 6            中键弹起
EVENT_MOUSEHWHEEL = 11        滚动条向左，flags>0。向右，flags<0
EVENT_MOUSEMOVE = 0            鼠标移动
EVENT_MOUSEWHEEL = 10        滚动条向上，flags>0。向下，flags<0
EVENT_RBUTTONDBLCLK = 8        中键双击
EVENT_RBUTTONDOWN = 2        中键击下
EVENT_RBUTTONUP = 5            中键弹起
'''

import numpy as np
import cv2
drawing = False #鼠标按下为真
mode = True #如果为真，画矩形，按m切换为曲线
ix,iy=-1,-1
def draw_circle(event,x,y,flags,param):
    global ix,iy,drawing,mode
    if event == cv2.EVENT_LBUTTONDOWN:
        drawing = True
        ix,iy=x,y
        cv2.circle(img, (ix, iy), 2, (0, 255, 0), -1)
    # elif event == cv2.EVENT_MOUSEMOVE:
    #     if drawing == True:
    #         if mode == True:
    #             cv2.rectangle(img,(ix,iy),(x,y),(0,255,0), -1)
    #         else:
    #             cv2.circle(img,(x,y),5,(0,0,255),-1)
    elif event == cv2.EVENT_LBUTTONUP:
        drawing = False
        if mode == True:
            cv2.rectangle(img,(ix,iy),(x,y),(0,255,0), 2)
            print((ix, iy), (x, y))
        else:
            cv2.circle(img,(x,y),5,(0,0,255),-1)
img = cv2.imread('E:/1.jpg')
cv2.namedWindow('image')
cv2.setMouseCallback('image',draw_circle)
while(1):
    cv2.imshow('image',img)
    k = cv2.waitKey(1) & 0xFF
    if k == ord('m') :
        mode = not mode
    elif k == 27:
        break
cv2.destroyAllWindows()