Opencv:检测鼠标在图片上点击的位置 [英] Opencv: detect mouse position clicking over a picture

问题描述

我有这个代码，我只是在其中使用 OpenCV 显示图像:

I have this code in which I simply display an image using OpenCV:

    import numpy as np 
    import cv2

    class LoadImage:
        def loadImage(self):
            self.img=cv2.imread('photo.png')
            cv2.imshow('Test',self.img)

            self.pressedkey=cv2.waitKey(0)

            # Wait for ESC key to exit
            if self.pressedkey==27:
                cv2.destroyAllWindows()

    # Start of the main program here        
    if __name__=="__main__":
        LI=LoadImage()
        LI.loadImage()

一旦窗口显示了其中的照片，我想在控制台(终端)上显示单击图片时鼠标的位置.我不知道如何执行此操作.有什么帮助吗?

Once the window displayed with the photo in it, I want to display on the console (terminal) the position of the mouse when I click over the picture. I have no idea how to perform this. Any help please?

推荐答案

这里是一个鼠标回调函数示例，捕获左键双击

Here is an example mouse callback function, that captures the left button double-click

def draw_circle(event,x,y,flags,param):
    global mouseX,mouseY
    if event == cv2.EVENT_LBUTTONDBLCLK:
        cv2.circle(img,(x,y),100,(255,0,0),-1)
        mouseX,mouseY = x,y

然后您需要将该函数绑定到将捕获鼠标单击的窗口

You then need to bind that function to a window that will capture the mouse click

img = np.zeros((512,512,3), np.uint8)
cv2.namedWindow('image')
cv2.setMouseCallback('image',draw_circle)

然后，在无限处理循环中(或任何你想要的)

then, in a infinite processing loop (or whatever you want)

while(1):
    cv2.imshow('image',img)
    k = cv2.waitKey(20) & 0xFF
    if k == 27:
        break
    elif k == ord('a'):
        print mouseX,mouseY

这段代码有什么作用?

它将鼠标位置存储在全局变量 mouseX &mouseY 每次在黑色窗口内双击并按下将创建的 a 键.

It stores the mouse position in global variables mouseX & mouseY every time you double click inside the black window and press the a key that will be created.

elif k == ord('a'):
    print mouseX,mouseY

每次按下 a 按钮时都会打印当前存储的鼠标点击位置.

will print the current stored mouse click location every time you press the a button.

代码借用"来自这里.

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