鼠標(biāo)事件類型 OpenCV 支持多種鼠標(biāo)事件類型，常見(jiàn)的包括：

cv2.EVENT_LBUTTONDOWN：左鍵按下

cv2.EVENT_RBUTTONDOWN：右鍵按下

cv2.EVENT_MBUTTONDOWN：中鍵按下

cv2.EVENT_LBUTTONUP：左鍵釋放

cv2.EVENT_RBUTTONUP：右鍵釋放

cv2.EVENT_MBUTTONUP：中鍵釋放

cv2.EVENT_MOUSEMOVE：鼠標(biāo)移動(dòng)

cv2.EVENT_LBUTTONDBLCLK：左鍵雙擊

cv2.EVENT_RBUTTONDBLCLK：右鍵雙擊

cv2.EVENT_MBUTTONDBLCLK：中鍵雙擊

代碼

實(shí)現(xiàn)點(diǎn)擊鼠標(biāo)左鍵不放移動(dòng)可以畫(huà)圖，點(diǎn)擊c鍵盤(pán)去掉恢復(fù)

import cv2
import numpy as np# 定義全局變量
drawing = False
ix, iy = -1, -1# 定義鼠標(biāo)回調(diào)函數(shù)
def mouse_callback(event, x, y, flags, param):global drawing, ix, iyif event == cv2.EVENT_LBUTTONDOWN:drawing = Trueix, iy = x, yelif event == cv2.EVENT_MOUSEMOVE:if drawing:cv2.line(img, (ix, iy), (x, y), (0, 123, 255), 2)  # 使用 BGR 顏色格式，紅色為 (0, 0, 255)ix, iy = x, yelif event == cv2.EVENT_LBUTTONUP:drawing = Falsecv2.line(img, (ix, iy), (x, y), (0, 133, 255), 2)  # 使用 BGR 顏色格式，紅色為 (0, 0, 255)# 創(chuàng)建一個(gè)純白底圖
img = np.ones((512, 512, 3), np.uint8) * 255  # 創(chuàng)建一個(gè)純白圖像# 創(chuàng)建一個(gè)窗口
cv2.namedWindow('Image')# 設(shè)置鼠標(biāo)回調(diào)函數(shù)
cv2.setMouseCallback('Image', mouse_callback)# 顯示圖像并等待用戶交互
while True:cv2.imshow('Image', img)key = cv2.waitKey(1) & 0xFFif key == 27:  # 按下 ESC 鍵退出breakelif key == ord('c'):  # 'c'鍵清除畫(huà)布img = np.ones((480, 640, 3), dtype=np.uint8) * 255# 保存圖像
cv2.imwrite('output_image.jpg', img)cv2.destroyAllWindows()