Redondant display of a confirmation form

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1

Hi, I have an issue with my streamlit code when I perform facial recognition. If the person is recognized, they are asked for confirmation. If yes, then they are added to the csv file. The problem is that the confirmation form is being displayed infinitely. How do we solve it so it asks only once for confirmation?

while True:
    successful_frame_read, frame = webcam.read()
    if not successful_frame_read:
        st.write("Failed to capture frame")
        break

    # Convert frame to RGB format
    rgb_frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)

    # Detect faces in the image
    face_locations = face_recognition.face_locations(rgb_frame)
    face_encodings = face_recognition.face_encodings(rgb_frame, face_locations)

    if len(face_locations) == 0:
        # If no faces detected, check for timeout
        if datetime.now() - last_known_face_time >= not_recognized_duration:
            print("No recognized face detected for 30 seconds. Exiting...")
            break

    for face_encoding, (top, right, bottom, left) in zip(face_encodings, face_locations):
        # Compare face encoding with known encodings
        matches = face_recognition.compare_faces(encodeListKnown, face_encoding, tolerance=0.5)
        if True in matches:
            # Get the index of the matched face
            match_index = matches.index(True)
            student_id = studentIDs[match_index]
            firstname, lastname = display_student_info(student_id)
            if firstname and lastname:

                if modeType == 0:  # Check if mode is "Active" and confirmation is not displayed
                    confirmation_key = f"{firstname}_{lastname}_{datetime.now().strftime('%Y%m%d%H%M%S')}_confirmation"
                    #mylist = ("","No", "Yes")
                    # Initialize the session state
                    if 'selection' not in st.session_state:
                        st.session_state['selection'] = 0
                        confirmation = st.selectbox(f"Are you {firstname} {lastname}?", ("No", "Yes"), key=confirmation_key, index=st.session_state['selection'], placeholder="Sellect your option")
                        if confirmation is not None:
                            #confirmation_displayed = True  # Confirmation displayed
                            if confirmation == "Yes":
                                # Draw rectangle and display student info
                                cv2.rectangle(frame, (left, top), (right, bottom), (0, 255, 0), 2)
                                cv2.putText(frame, f"{lastname} {student_id}", (left, top - 10), cv2.FONT_HERSHEY_SIMPLEX, 1,(0, 255, 0), 2)
                                student_name = f"{firstname} {lastname}"
                                save_to_csv(student_name)
                                marked_time = datetime.now()
                                modeType = 1  # Change mode to "Marked"
                                mode_display.write("Mode Type: Marked")
                                # Wait for a second before changing to "Already Marked"
                                time.sleep(5)
                                modeType = 2
                                mode_display.write("Mode Type: Already Marked")
                            elif confirmation=="No":
                                mode_display.write("Mode Type: Active")  # User rejected confirmation
                        # Update last known face time for timeout check
                        last_known_face_time = datetime.now()
        else:
            # Draw rectangle and label as "Unknown"
            cv2.rectangle(frame, (left, top), (right, bottom), (0, 0, 255), 2)
            cv2.putText(frame, "Unknown", (left, top - 10), cv2.FONT_HERSHEY_SIMPLEX, 1, (0, 0, 255), 2)

    # Update mode type and check for mode transitions
    if modeType == 1 and datetime.now() - marked_time >= marked_duration:
        modeType = 2  # Change mode to "Already Marked"

    # Check if program should end due to "Already Marked" mode
    if modeType == 2 and datetime.now() - marked_time >= already_marked_duration:
        # Calculate total time and time taken to mark
        total_time = datetime.now() - start_time
        time_taken_to_mark = marked_time - start_time

        # Display time taken to mark and total time
        st.write(f"Time taken to mark: {time_taken_to_mark}")
        st.write(f"Total time: {total_time}")

        # End the program
        break

    # Display the frame with bounding boxes
    temp.image(cv2.cvtColor(frame, cv2.COLOR_BGR2RGB), channels="RGB", use_column_width=True)

# Add a button to download the CSV file
csv_download_button = st.download_button(
    label="Download Attendance CSV",
    data=open('attendance.csv', 'rb'),
    file_name='attendance.csv',
    mime='text/csv'
)
if csv_download_button:
    st.write("Download complete!")
2

Hi,

The issue you’re encountering is because the confirmation form inside the while True loop is being repeatedly displayed due to the loop continuously running. To ensure the confirmation form is displayed only once, you need to break out of the loop once the confirmation is obtained.

# Ask for confirmation only if it's not already displayed
if st.session_state.get(confirmation_key) is None:
      st.session_state[confirmation_key] = st.selectbox(f"Are you {firstname} {lastname}?", ("No", "Yes"), key=confirmation_key)
confirmation = st.session_state.get(confirmation_key)
3

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