app.py

import cv2
import numpy as np
import base64
from flask import Flask, render_template
from flask_socketio import SocketIO, emit
from io import BytesIO
from PIL import Image

# Initialize Flask app and SocketIO
app = Flask(__name__)
socketio = SocketIO(app)

@app.route('/')
def index():
    """Serve the HTML page."""
    return render_template('index2.html')

@socketio.on('video_frame')
def handle_video_frame(data):
    """Receive video frame from client, apply Canny edge detection, and emit the processed frame."""
    # Extract the base64 image from the client
    frame_data = data['image']
    
    # Decode the base64 image to bytes
    img_data = base64.b64decode(frame_data)
    
    # Convert the image data to a numpy array
    np_arr = np.frombuffer(img_data, np.uint8)
    frame = cv2.imdecode(np_arr, cv2.IMREAD_COLOR)
    
    if frame is not None:
        # Apply Canny edge detection
        edges = cv2.Canny(frame, 100, 200)

        # Convert the edges image to BGR (for compatibility with base64 encoding)
        edges_bgr = cv2.cvtColor(edges, cv2.COLOR_GRAY2BGR)

        # Convert the processed image (edges) to base64
        _, buffer = cv2.imencode('.jpg', edges_bgr)
        edges_str = base64.b64encode(buffer).decode('utf-8')

        # Emit the processed frame back to the client
        emit('display_frame', {'image': edges_str}, broadcast=True)

if __name__ == '__main__':
    socketio.run(app, host='0.0.0.0', port=5000)