OpenCV with Python By Example

Mouse inputs

In this section, we will see how to use the mouse to interact with the display window. Let's start with something simple. We will write a program that will detect the quadrant in which the mouse click was detected. Once we detect it, we will highlight that quadrant.

import cv2 import numpy as np def detect_quadrant(event, x, y, flags, param): if event == cv2.EVENT_LBUTTONDOWN: if x > width/2: if y > height/2: point_top_left = (int(width/2), int(height/2)) point_bottom_right = (width-1, height-1) else: point_top_left = (int(width/2), 0) point_bottom_right = (width-1, int(height/2)) else: if y > height/2: point_top_left = (0, int(height/2)) point_bottom_right = (int(width/2), height-1) else: point_top_left = (0, 0) point_bottom_right ...