Python获取图像中像素点坐标实例代码

# -*- coding: utf-8 -*-
"""
Created on Mon Jan 10 13:58:57 2022
@author: 2540817538（有问题联系此QQ）
"""
import cv2
img=cv2.imread('C:/Users/25408/Desktop/p1.jpg')
 
def on_EVENT_LBUTTONDOWN(event, x, y, flags, param):
    if event == cv2.EVENT_LBUTTONDOWN:
        xy = "%d,%d" % (x, y)
        print(x,y)
        cv2.circle(img, (x, y), 2, (0, 0, 255))
        cv2.putText(img, xy, (x, y), cv2.FONT_HERSHEY_PLAIN,1.0, (0,0,255))
        cv2.imshow("image", img)
        
cv2.namedWindow("image")
cv2.setMouseCallback("image", on_EVENT_LBUTTONDOWN)
while(1):
    cv2.imshow("image", img)
    key = cv2.waitKey(5) & 0xFF
    if key == ord('q'):
        break
cv2.destroyAllWindows()

import cv2
import numpy as np
img = cv2.imread('C:\\Users\\mimi\\Desktop\\1.jpg')
a =[]
b = []
def on_EVENT_LBUTTONDOWN(event, x, y,flags, param):
    if event == cv2.EVENT_LBUTTONDOWN:
        xy = "%d,%d" % (x, y)
        a.append(x)
        b.append(y)
        cv2.circle(img, (x, y), 1, (255, 0, 0), thickness=-1)
        cv2.putText(img, xy, (x, y), cv2.FONT_HERSHEY_PLAIN,
                    1.0, (0, 0, 0), thickness=1)
        cv2.imshow("image", img)

cv2.namedWindow("image")
cv2.setMouseCallback("image", on_EVENT_LBUTTONDOWN)
cv2.imshow("image", img)
cv2.waitKey(0)
print(a[0],b[0])

img[b[0]:b[1],a[0]:a[1],:] = 0   #注意是 行，列（y轴的，X轴）
cv2.imshow("image", img)
cv2.waitKey(0)
print (a,b)

import matplotlib.pyplot as plt
from PIL import Image

im = Image.open("C:\\Users\\mimi\\Desktop\\1.jpg")
plt.imshow(im, cmap = plt.get_cmap("gray"))
pos=plt.ginput(2)
print(pos)
a=[]
b=[]
for i in range(len(pos)):
    a.append(pos[i][0])
    b.append(pos[i][1])
print (a,b)
im[a[0]:a[1],b[0]:b[1],:]
plt.imshow(im)