Python圖像處理之簡單畫板實現方法示例

2020-01-04 14:37:05

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本文實例講述了Python圖像處理之簡單畫板實現方法。分享給大家供大家參考，具體如下：

Python圖像處理也是依賴opencv的Python接口實現的，Python語言簡單易懂，簡潔明了。本次實現畫板涂鴉，一個是在里面畫矩形，還有畫線。其他也都可以擴展，本案例只做例程，思路是對鼠標事件的處理，以及滾動條調節顏色處理。鼠標事件就包含有左鍵按下，以及釋放事件的處理。

import cv2import numpy as np# null functiondef nothing(x):  passDrawing = FalseMode = TrueIX,IY = -1,-1def drawCircle(Event,X,Y,Flags,Param):  R = cv2.getTrackbarPos('R','Image')  G = cv2.getTrackbarPos('G','Image')  B = cv2.getTrackbarPos('B','Image')#get color value  Color = (B,G,R);  global IX,IY,Drawing,Mode  if Event == cv2.EVENT_LBUTTONDOWN:    Drawing = True    IX,IY = X,Y  elif Event == cv2.EVENT_MOUSEMOVE and Flags == cv2.EVENT_FLAG_LBUTTON:    if Drawing == True:      if Mode == True:        cv2.rectangle(Img,(IX,IY),(X,Y),Color,-1)      else:        cv2.circle(Img,(X,Y),3,Color,-1);  elif Event == cv2.EVENT_LBUTTONUP:    Drawing = False#create image with 3 chanelsImg = np.zeros((660,660,3),np.uint8)#create windowcv2.namedWindow('Image')#create track bar, range for 0~255cv2.createTrackbar('R','Image',0,255,nothing)cv2.createTrackbar('G','Image',0,255,nothing)cv2.createTrackbar('B','Image',0,255,nothing)#set mouse ackcv2.setMouseCallback('Image',drawCircle)while(1):  cv2.imshow('Image',Img)  k = cv2.waitKey(10)&0xFF  #switch draw mode  if k == ord('m'):    Mode = not Mode  elif k == 27:    break#you must destroy all of sourcescv2.destroyAllWindows()

最后的效果圖如下：

Python,圖像處理,畫板