python+opencv鼠标操作以及制作调色板并画图

来源：互联网发布：事件提醒软件编辑：程序博客网时间：2024/06/06 04:01

鼠标操作：

#!/usr/bin/env pythonimport numpy as npimport cv2events=[i for i in dir(cv2) if 'EVENT' in i]#events=[i for i in dir(cv2)]print eventsdef draw_circle(event, x, y, flags, param):    if event == cv2.EVENT_LBUTTONDBLCLK:        cv2.circle(img, (x, y), 100, (255,0,0), -1)img = np.zeros((512,512,3), np.uint8)cv2.namedWindow('image')cv2.setMouseCallback('image', draw_circle)while(True):    cv2.imshow('image', img)    if cv2.waitKey(20)&0xff == 27:        breakcv2.deltroyAllWindows()

跟随鼠标移动进行绘制矩形或者画圆

#!/usr/bin/env pythonimport numpy as npimport cv2drawing = Falsemode = Trueix, iy = -1, -1def draw_circle(event, x, y, flags, param):    global ix, iy, drawing, mode    if event == cv2.EVENT_LBUTTONDOWN:        print 'left button down'        drawing = True        ix, iy = x,y    #elif event == cv2.EVENT_MOUSEMOVE and flags == cv2.EVENT_FLAG_LBUTTON:    elif event == cv2.EVENT_MOUSEMOVE:        print 'mouse move'        if drawing == True:            if mode == True:                cv2.rectangle(img, (ix, iy), (x,y), (0,255,0), -1)            else:                cv2.circle(img, (x, y), 10, (255,0,0), -1)    elif event == cv2.EVENT_LBUTTONUP:        print 'left button up'        drawing = Falseimg = np.zeros((512,512,3), np.uint8)cv2.namedWindow('image')cv2.setMouseCallback('image', draw_circle)while(True):    cv2.imshow('image', img)    k = cv2.waitKey(1)&0xff    if k == ord('m'):        print 'you typed key m'        mode = not mode    elif k == 27:        break

制作调色板：

#!/usr/bin/env pythonimport numpy as npimport cv2def def_func(x):    passimg = np.zeros((512,512,3), np.uint8)cv2.namedWindow('image')cv2.createTrackbar('R','image',0,255,def_func)cv2.createTrackbar('G','image',0,255,def_func)cv2.createTrackbar('B','image',0,255,def_func)switch = '0:OFF\n1:ON'cv2.createTrackbar(switch,'image',0,1,def_func)while(True):    cv2.imshow('image', img)    k = cv2.waitKey(1)&0xff    if k == 27:        break    r = cv2.getTrackbarPos('R', 'image')    g = cv2.getTrackbarPos('G', 'image')    b = cv2.getTrackbarPos('B', 'image')    s = cv2.getTrackbarPos(switch, 'image')    if s == 0:        img[:] = 0    else:        img[:] = [b,g,r]cv2.destroyAllWindows()

制作一个画板，可以选择颜色，然后移动鼠标画图：

#!/usr/bin/env pythonimport numpy as npimport cv2drawing = Falsemode = Trueix, iy = -1, -1def def_func(x):    passdef draw_circle(event, x, y, flags, param):    r = cv2.getTrackbarPos('R', 'image')    g = cv2.getTrackbarPos('G', 'image')    b = cv2.getTrackbarPos('B', 'image')    color = (b,g,r)    global ix, iy, drawing, mode    if event == cv2.EVENT_LBUTTONDOWN:        print 'left button down'        drawing = True        ix, iy = x,y    #elif event == cv2.EVENT_MOUSEMOVE and flags == cv2.EVENT_FLAG_LBUTTON:    elif event == cv2.EVENT_MOUSEMOVE:        print 'mouse move'        if drawing == True:            if mode == True:                cv2.rectangle(img, (ix, iy), (x,y), color, -1)            else:                cv2.circle(img, (x, y), 10, color, -1)    elif event == cv2.EVENT_LBUTTONUP:        print 'left button up'        drawing = Falseimg = np.zeros((512,512,3), np.uint8)cv2.namedWindow('image')cv2.createTrackbar('R','image',0,255,def_func)cv2.createTrackbar('G','image',0,255,def_func)cv2.createTrackbar('B','image',0,255,def_func)cv2.setMouseCallback('image', draw_circle)while(True):    cv2.imshow('image', img)    k = cv2.waitKey(1)&0xff    if k == ord('m'):        print 'you typed key m'        mode = not mode    elif k == 27:        breakcv2.destroyAllWindows()

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