python opencv 画点获取外接矩形

目录

打点就行：

选多个点：

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打点就行：

import cv2

# 定义全局变量，存储鼠标选择的点坐标
point = []

# 定义鼠标事件回调函数
def select_point(event, x, y, flags, param):
    global point

    if flags == cv2.EVENT_FLAG_RBUTTON:
        point = []
        cv2.imshow('image', img)
    if event == cv2.EVENT_LBUTTONDOWN:
        point = [x, y]

    elif event == cv2.EVENT_MOUSEMOVE:
        img_temp = img.copy()
        if len(point) > 0:
            cv2.rec