opencv3/python 滑鼠響應操作詳解
阿新 • • 發佈:2020-01-09
滑鼠回撥函式:
def setMouseCallback( windowName,#視窗名稱 onMouse,#滑鼠響應處理函式 param=None) #處理函式的ID
event滑鼠事件:
event: EVENT_LBUTTONDBLCLK = 7 左鍵雙擊 EVENT_LBUTTONDOWN = 1 左鍵點選 EVENT_LBUTTONUP = 4 左鍵釋放 EVENT_MBUTTONDBLCLK = 9 中間釋放 EVENT_MBUTTONDOWN = 3 中間點選 EVENT_MBUTTONUP = 6 中間釋放 EVENT_MOUSEHWHEEL = 11 滾輪事件 EVENT_MOUSEMOVE = 0 滑動 EVENT_MOUSEWHEEL = 10 滾輪事件 EVENT_RBUTTONDBLCLK = 8 右鍵雙擊 EVENT_RBUTTONDOWN = 2 右鍵點選 EVENT_RBUTTONUP = 5 右鍵釋放 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 左鍵拖拽 EVENT_FLAG_MBUTTON = 4 中鍵拖拽 EVENT_FLAG_RBUTTON = 2 右鍵拖拽 EVENT_FLAG_SHIFTKEY = 16 按Shift不放事件
示例
在影象上用滑鼠點選左鍵拖拽畫一矩形,並輸出矩形資訊:
import cv2 def draw_rectangle(event,x,y,flags,param): global ix,iy if event==cv2.EVENT_LBUTTONDOWN: ix,iy = x,y print("point1:=",y) elif event==cv2.EVENT_LBUTTONUP: print("point2:=",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") #載入圖片 cv2.namedWindow('image') cv2.setMouseCallback('image',draw_rectangle) while(1): cv2.imshow('image',img) if cv2.waitKey(20) & 0xFF == 27: break cv2.destroyAllWindows()
輸出:
point1:= 254 64 point2:= 708 569 width= 454 height= 505
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