app.py

import streamlit as st
import cv2
from ultralytics import YOLO

model = YOLO('best.pt')


def track(source, iou, conf):
    #result = model.track(source=source, device='mps')
    result = model.track(source=source, iou=iou, conf=conf, device='cpu')
    return result

def inferir_camara(camera1, iou, conf, st_frame, st_cantidad, stop_button_pressed):
    while camera1.isOpened() and not stop_button_pressed:
        ret, frame = camera1.read()
        if not ret:
            st.write("Video Capture Ended")
            break
        
        frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
        
        resultado = track(frame, iou, conf)

        # Extract bounding boxes (replace this with the specific method from your library)
        boxes = resultado[0].boxes.cls  # Boxes object for bbox outputs
        
        # Update object count
        object_count = len(boxes)
        
        st_cantidad.write(f'Cantidad detectados: {object_count}')
        
        res_plotted = resultado[0].plot()
        
        st_frame.image(res_plotted,
                        caption='Detected Video',
                        channels="RGB",
                        #use_column_width=True
                        )

        if cv2.waitKey(1) & 0xFF == ord("q") or stop_button_pressed:
            break

# Define function to display frames from two cameras
def display_two_cameras(camera1, camera2):
    while True:
        # Capture frames from both cameras
        success1, frame1 = camera1.read()
        success2, frame2 = camera2.read()

        # Check if both captures were successful
        if success1 and success2:
            # Display the frames side-by-side
            frames = np.hstack((frame1, frame2))  # Concatenate frames horizontally
            cv2.imshow('Two Cameras', frames)  # Display the combined frame

            # Check for keyboard input to quit
            if cv2.waitKey(1) & 0xFF == ord('q'):
                break
        else:
            # Handle camera failure
            print("Error capturing frames from one or both cameras.")
            break

    # Release cameras
    camera1.release()
    camera2.release()
    cv2.destroyAllWindows()

# Try to open two cameras
try:
    camera1 = cv2.VideoCapture(0)  # Open camera 0
    camera2 = cv2.VideoCapture(0)  # Open camera 1

    # Check if both cameras opened successfully
    if camera1.isOpened() and camera2.isOpened():
        display_two_cameras(camera1, camera2)
    else:
        print("Failed to open both cameras. Showing single camera feed.")

        # Open and display only available camera
        camera = cv2.VideoCapture(0 if not camera1.isOpened() else 1)
        if camera.isOpened():
            while True:
                success, frame = camera.read()
                if success:
                    cv2.imshow('Single Camera', frame)
                    if cv2.waitKey(1) & 0xFF == ord('q'):
                        break
                else:
                    print("Error capturing frame.")
                    break

            camera.release()
            cv2.destroyAllWindows()
except Exception as e:
    print(f"Error accessing cameras: {e}")


# Interfaz
st.set_page_config(page_title="Tracking YOLOv8")
st.title("Tracking YOLOv8")
play_button_pressed = st.empty()
stop_button_pressed = st.button("Detener")

iou = float(st.sidebar.slider("NMS IoU threshold", 30, 100, 80)) / 100 # Umbral de intersección sobre unión (IoU) para NMS
conf = float(st.sidebar.slider("Umbral o threshold", 30, 100, 80)) / 100 # Select Model Confidence

st_frame_camara_1 = st.empty()
st_frame_camara_2 = st.empty()

st_cantidad_1 = st.empty()
st_cantidad_2 = st.empty()

play_button_1 = st.button("Iniciar cámara 1", on_click=inferir_camara(camera1, iou, conf, st_frame_camara_1, st_cantidad_1, stop_button_pressed))
#play_button_2 = st.button("Iniciar cámara 2", on_click=inferir_camara(camera2, iou, conf, st_frame_camara_2, st_cantidad_2, stop_button_pressed))

#camera1.release()
#camera2.release()
#cv2.destroyAllWindows()