OpenCV人脸识别程序崩溃

Question

代码如下（我删除了所有不重要的内容）

closed = False

faceClassifier = cv2.CascadeClassifier('face.xml')
eyeClassifier = cv2.CascadeClassifier('eye.xml')
bodyClassifier = cv2.CascadeClassifier('body.xml')
cap = cv2.VideoCapture(0)
def drawBox():
    while closed == False:
        ret, img = cap.read()
        gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
        faces = faceClassifier.detectMultiScale(img, 1.3, 5)
        for (x,y,w,h) in faces:
            cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,0),2)
            roi_gray = gray[y:y+h, x:x+w]
            roi_color = img[y:y+h, x:x+w]

            eyes = eyeClassifier.detectMultiScale(roi_gray)
            for (ex,ey,ew,eh) in eyes:
                cv2.rectangle(roi_color,(ex,ey),(ex+ew,ey+eh),(0,255,0),2)
        cv2.imshow('img',img)

def stopProgram():
    closed = True

tkWindow = Tk()  
tkWindow.geometry('800x800')  
tkWindow.title('Machine Learning Face Detection')



button = Button(tkWindow,
text = 'Stop Program',
command = stopProgram)  
button.pack()  

button = Button(tkWindow,
text = 'Start Program',
command = drawBox)  
button.pack() 

tkWindow.mainloop()
cap.release()
cv2.destroyAllWindows()

当我点击启动程序错误时，相机窗口将以灰色打开，然后崩溃。有人知道为什么吗？我想不出来，但在我尝试执行停止按钮之前，它就已经起作用了

Answer 1

第一个问题是在函数drawBox和stopProgram中没有将closed标记为全局变量。另一个问题是drawBox中的while循环，这将导致程序停止响应，从而导致“停止程序”按钮不可用。您需要使用tkWindow.afterHere是在{}中显示来自{}的视频帧的示例