flet brings up a blank screen. while while runs continuously

[bobwatcherx]

Question

I often get something like this. like a realtime application on a flet screen. so I want to make a realtime application to detect whether you are sleepy or not. if sleepy pops up a warning dialog that you are sleepy and if not . your dialog appears fine. but it looks like just a blank white screen and doesn't work properly

Code sample

from flet import *
import cv2
import dlib
import numpy as np
import time


detector = dlib.get_frontal_face_detector()
predictor = dlib.shape_predictor('shape_predictor_68_face_landmarks.dat')
EAR_THRESHOLD = 0.2
cap = cv2.VideoCapture(0)


def main(page:page):


	notice_dialog = AlertDialog(
		title=Text(""),
		content=Column([
			Text("you ok for work",size=35,
				weight="bold",
				color="green"),
			Icon(name="face",size=90,color="green")
			])
		)
	page.dialog = notice_dialog

	def get_EAR(eye):
	    A = np.linalg.norm(eye[1] - eye[5])
	    B = np.linalg.norm(eye[2] - eye[4])
	    C = np.linalg.norm(eye[0] - eye[3])

	    # Calculate the eye aspect ratio (EAR)
	    EAR = (A + B) / (2.0 * C)

	    return EAR

	def draw_landmarks(frame, landmarks):
	    # Draw a circle at each landmark point
	    for (x, y) in landmarks:
	        cv2.circle(frame, (x, y), 2, (0, 0, 255), -1)

	def detect_face():
		while True:
			ret, frame = cap.read()
			gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
			faces = detector(gray, 0)
			if len(faces) == 0:
				print("NO FACE GUYS")
				notice_dialog.content.controls[0].value = "FAce Not found "
				notice_dialog.content.controls[1].color = "yellow"
				page.update()
			for face in faces:
				landmarks = predictor(gray, face)
				left_eye = np.array([(landmarks.part(36).x, landmarks.part(36).y),
		                             (landmarks.part(37).x, landmarks.part(37).y),
		                             (landmarks.part(38).x, landmarks.part(38).y),
		                             (landmarks.part(39).x, landmarks.part(39).y),
		                             (landmarks.part(40).x, landmarks.part(40).y),
		                             (landmarks.part(41).x, landmarks.part(41).y)])
				right_eye = np.array([(landmarks.part(42).x, landmarks.part(42).y),
		                              (landmarks.part(43).x, landmarks.part(43).y),
		                              (landmarks.part(44).x, landmarks.part(44).y),
		                              (landmarks.part(45).x, landmarks.part(45).y),
		                              (landmarks.part(46).x, landmarks.part(46).y),
		                              (landmarks.part(47).x, landmarks.part(47).y)])
				left_EAR = get_EAR(left_eye)
				right_EAR = get_EAR(right_eye)
				if left_EAR < EAR_THRESHOLD and right_EAR < EAR_THRESHOLD:
					print("Anda SLEEP !!!!")
					notice_dialog.content.controls[0].value = "you Sleep "
					notice_dialog.content.controls[1].color = "red"
					page.update()
				else:
					print("Anda ok for WORK")
					notice_dialog.content.controls[0].value = "you OK "
					notice_dialog.content.controls[1].color = "green"
					page.update()
				draw_landmarks(frame, left_eye)
				draw_landmarks(frame, right_eye)
			cv2.imshow('frame', frame)
			if cv2.waitKey(1) & 0xFF == ord('q'):
				break

		# Release the capture and close the windows
		cap.release()
		cv2.destroyAllWindows()

	detect_face()

	page.overlay.append(
		Text("drowsiness detector",size=25,weight="bold"),

		)
	page.dialog = notice_dialog
	notice_dialog.open = True

	page.add()
flet.app(target=main)

Error message

not up to expectations

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• I have searched for answers to my question both in the issues and in previous discussions.