opencv3/python 鼠标响应操作详解
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 cv2
def 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:
break
cv2.destroyAllWindows()
输出:
point1:= 254 64
point2:= 708 569
width= 454
height= 505
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