opencv - 用画笔样式的绘图覆盖实时视频？

Question

我需要一些最佳编程方法的指导，以便用画笔覆盖网络摄像头的实时视频(或预加载的视频)。即绘制线条，圆圈等以标记视频播放时的区域。

现在使用OpenCV + Tkinter，有没有更好的方法来解决这个问题？

谢谢

编辑:尝试直接在视频窗口上绘制，但无法使其正常工作..这是我的代码:

import cv2
import numpy as np
def interactive_drawing(event,x,y,flags,param):
    global ix,iy,drawing, mode

    if event==cv2.EVENT_LBUTTONDOWN:
        drawing=True
        ix,iy=x,y

    elif event==cv2.EVENT_MOUSEMOVE:
        if drawing==True:
            if mode==True:
                cv2.line(frame,(ix,iy),(x,y),(0,0,255),10)
                ix=x
                iy=y
                print x,y
    elif event==cv2.EVENT_LBUTTONUP:
        drawing=False
        if mode==True:
            cv2.line(frame,(ix,iy),(x,y),(0,0,255),10)
            ix=x
            iy=y
    return x,y

drawing=False # true if mouse is pressed
mode=True # if True, draw rectangle. Press 'm' to toggle to curve
cap = cv2.VideoCapture('track.avi')


while(cap.isOpened()):
    ret, frame = cap.read()
    if frame is None:
        break
 #   cv2.namedWindow("frame", cv2.WND_PROP_FULLSCREEN)
 #   cv2.setWindowProperty("frame",cv2.WND_PROP_FULLSCREEN,cv2.WINDOW_FULLSCREEN)
    cv2.setMouseCallback('frame',interactive_drawing)
    cv2.imshow('frame',frame)
    if cv2.waitKey(15) & 0xFF == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()



# mouse callback function






##img = np.zeros((512,512,3), np.uint8)
##
##cv2.namedWindow('begueradj')
##cv2.setMouseCallback('begueradj',interactive_drawing)
##while(1):
##    cv2.imshow('begueradje',img)
##    k=cv2.waitKey(1)&0xFF
##    if k==27:
##        break
##cv2.destroyAllWindows()

Answer 1

我只会为此使用 OpenCV ，因为它已经提供了drawing functions，例如:

行

矩形

圈子

椭圆

多边形

等

编辑:此代码段应帮助您入门。这里的重点是您必须将绘图元素保存在变量中(在我的情况下为 curve_points)，并在每个新框架上绘制它们:

import cv2
import numpy as np
def interactive_drawing(event,x,y,flags,param):
    global drawing, mode

    if event==cv2.EVENT_LBUTTONDOWN:
        drawing=True

    elif event==cv2.EVENT_MOUSEMOVE:
        if drawing==True:
            if mode==True:
                curves[len(curves)-1].append((x,y)) #append new points to the last list of curves

    elif event==cv2.EVENT_LBUTTONUP:
        drawing=False
        if mode==True:
            curves.append([]) #adding a new list to curves

    return x,y

def draw_curves(myArray):

    for j in range(0, len(myArray)):
        for i in range(1, len(myArray[j])):
            cv2.line(frame,myArray[j][i-1],myArray[j][i],(0,0,255),10)

drawing=False # true if mouse is pressed
mode=True # if True, draw rectangle. Press 'm' to toggle to curve
cap = cv2.VideoCapture(0) #cap = cv2.VideoCapture('track.avi')
curves = [[]] # initializing curves list with an empty list
cv2.namedWindow('frame')
cv2.setMouseCallback('frame',interactive_drawing)

while(cap.isOpened()):
    ret, frame = cap.read()
    if frame is None:
        break
    draw_curves(curves)
    cv2.imshow('frame',frame)
    if cv2.waitKey(15) & 0xFF == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()