鼠标回调函数：

def setMouseCallback(windowName, #窗口名称onMouse, #鼠标响应处理函数param=None) #处理函数的ID

event鼠标事件：

event：EVENT_LBUTTONDBLCLK = 7 左键双击EVENT_LBUTTONDOWN = 1 左键点击EVENT_LBUTTONUP = 4 左键释放EVENT_MBUTTONDBLCLK = 9 中间释放EVENT_MBUTTONDOWN = 3 中间点击EVENT_MBUTTONUP = 6 中间释放EVENT_MOUSEHWHEEL = 11 滚轮事件EVENT_MOUSEMOVE = 0 滑动EVENT_MOUSEWHEEL = 10 滚轮事件EVENT_RBUTTONDBLCLK = 8 右键双击EVENT_RBUTTONDOWN = 2 右键点击EVENT_RBUTTONUP = 5 右键释放flags:EVENT_FLAG_ALTKEY = 32 按Alt不放事件EVENT_FLAG_CTRLKEY = 8 按Ctrl不放事件EVENT_FLAG_LBUTTON = 1 左键拖拽EVENT_FLAG_MBUTTON = 4 中键拖拽EVENT_FLAG_RBUTTON = 2 右键拖拽EVENT_FLAG_SHIFTKEY = 16 按Shift不放事件

示例

在图像上用鼠标点击左键拖拽画一矩形，并输出矩形信息：

import cv2def draw_rectangle(event,x,y,flags,param): global ix, iy if event==cv2.EVENT_LBUTTONDOWN: ix, iy = x, y print("point1:=", x, y) elif event==cv2.EVENT_LBUTTONUP: print("point2:=", x, y) print("width=",x-ix) print("height=", y - iy) cv2.rectangle(img, (ix, iy), (x, y), (0, 255, 0), 2)img = cv2.imread("max.png") #加载图片cv2.namedWindow('image')cv2.setMouseCallback('image', draw_rectangle)while(1): cv2.imshow('image', img) if cv2.waitKey(20) & 0xFF == 27: breakcv2.destroyAllWindows()

输出：

point1:= 254 64point2:= 708 569width= 454height= 505

以上这篇opencv3/python 鼠标响应操作详解就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。