呼叫DestrionAllWindows()函数后，OPENCV窗口未关闭

Question

我使用openCV在python中实现凸轮速算法，并使用其给定的位置移动我的鼠标并绘制kolour应用程序。当我按tkinter UI中的按钮启动时，然后按下键" Q"帧"并没有关闭，框架只是冻结的，而强制退出的选项就会出现。我正在为UI使用TKINTER。

global paint_open
paint_open = 0
def func():
    global frame, roiPts, inputMode ,token
    camera = cv2.VideoCapture(0)
    cv2.namedWindow("frame")
    cv2.setMouseCallback("frame", selectROI)
    termination = (cv2.TERM_CRITERIA_EPS | cv2.TERM_CRITERIA_COUNT, 10, 1)
    roiBox = None
    li=[]
    while True:
        (grabbed, frame) = camera.read()
        if roiBox is not None:
            hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV)
            backProj = cv2.calcBackProject([hsv], [0], roiHist, [0, 180], 1) 
            (r, roiBox) = cv2.CamShift(backProj, roiBox, termination)
            pts = np.int0(cv2.cv.BoxPoints(r))
            li.append(pts)
            #coordinates contain the coordinates of the tracked object
            coordinates = r[0]
            # x, y contains the coordinates
            x = int(coordinates[0])
            y = int(coordinates[1])
            drawing(x,y)     
        #draws a circle around the center from x,y
        cv2.circle(frame, (int(x), int(y)), 4, (0, 0, 255), 2)

        #draws a colored frame around the object
        cv2.polylines(frame, [pts], True, (255, 0, 0), 2)
        #here imshow function start
        cv2.imshow("frame", frame)
        key = cv2.waitKey(1) & 0xFF

        # handle if the 'i' key is pressed, then go into ROI
        if key == ord("i") and len(roiPts) < 4:
            inputMode = True
            orig = frame.copy()
            while len(roiPts) < 4:
                cv2.imshow("frame", frame)
                cv2.waitKey(0)
                roiPts = np.array(roiPts)
                s = roiPts.sum(axis = 1)
                tl = roiPts[np.argmin(s)]
                br = roiPts[np.argmax(s)]

            roi = orig[tl[1]:br[1], tl[0]:br[0]]
            roi = cv2.cvtColor(roi, cv2.COLOR_BGR2HSV)

            roiHist = cv2.calcHist([roi], [0], None, [16], [0, 180])
            roiHist = cv2.normalize(roiHist, roiHist, 0, 255, cv2.NORM_MINMAX)
            roiBox = (tl[0], tl[1], br[0], br[1])
        # if the 'q' key is pressed, stop the loop
        elif key == ord("q"):
            break

    camera.release()
    cv2.destroyAllWindows()
def drawing(x,y):
    global paint_open
    if paint_open == 0:
        launchapp('kolourpaint')
        paint_open = 1
    py.dragTo(x,y)
def main():
    root=tk.Tk()
    bkgcolor='#D84315'
    root.configure(background=bkgcolor)
    label=tk.Label(root,text="Gesture Recognition Project",font=('arial black',12),fg="white",width=90,height=3,bg="purple")
    label.pack()
    frame1 = tk.Frame(root,bg=bkgcolor)
    frame1.pack(padx=205,pady=25)
    bframe1 = tk.Frame(root,bg=bkgcolor)
    bframe1.pack(side=tk.BOTTOM,padx=205)

    photo3 = tk.PhotoImage(file="3.png")

    button2 = tk.Button(frame1, width=255, height=255, image=photo3,text="Slide Presenter",fg="purple",bg="white",command=func)
    button2.pack(side=tk.LEFT,padx=25)
    button2.image = photo1


# start the event loop
root.mainloop()

Answer 1

这个问题有点旧，但值得回答，因为它出现在搜索中。我遇到了同样的问题，并最终找到了有效的答案。它似乎是hack-ish，但允许OpenCV通过其流程来关闭窗口。OPENCV在Waitkey（）期间执行其处理，因此在DestrolAllWindows（）函数之前和之后添加其中一些功能。

在您的代码中，它说

cv2.destroyAllWindows()

...改用此。它对我有用。

# All these waitkeys are a hack to get the OpenCV window to close
cv2.waitKey(1)
cv2.destroyAllWindows()
for i in range (1,5):
    cv2.waitKey(1)
return

Answer 2

我不确定，但是cv可能会使用tkinter显示窗口，因此root.mainloop()可能会保持窗口打开。您可以尝试结束root.mainloop()关闭程序和所有Windows。

import Tkinter as tk
import cv2
# create global value (with some value)
root = None
def func():
    # inform function to use global variable instead of local one
    global root
    # ...
    cv2.destroyAllWindows()
    camera.release()
    # close root window and leave mainloop()
    root.destroy()
def main():
    # inform function to use global variable instead of local one
    global root
    root = tk.Tk()
    # ...
    root.mainloop()
main()

Answer 3

由于在调用destroyallwindows（）函数时打开了一个新窗口，因此您需要按Space-Key关闭命令的执行。

Answer 4

这项工作

while True: 
    _, frame = cap.read()
    cv2.imshow(windowName, frame)
    keyCode = cv2.waitKey(1)
    if cv2.getWindowProperty(windowName, cv2.WND_PROP_VISIBLE) <1:
        break
cv2.destroyAllWindows()

来自https://newbedev.com/closing-video-window-isus-close-close-x-button-in-opencv-python