app.py

import onnxruntime as ort
import numpy as np
import cv2
from PIL import Image
import streamlit as st

# Load ONNX model
onnx_model = ort.InferenceSession("onnx_model.onnx")

# Preprocess image function
def preprocess_image(image):
    """Preprocess image to match model input requirements"""
    image = cv2.cvtColor(np.array(image), cv2.COLOR_RGB2GRAY)  # Convert to grayscale
    image_resized = cv2.resize(image, (48, 48))  # Resize to 48x48
    image_input = np.expand_dims(image_resized, axis=0)  # Add batch dimension
    image_input = np.expand_dims(image_input, axis=3)  # Add channel dimension
    image_input = image_input.astype(np.float32) / 255.0  # Normalize
    return image_input

# Predict emotion using the ONNX model
def predict_emotion_onnx(onnx_model, image_input):
    input_name = onnx_model.get_inputs()[0].name
    output_name = onnx_model.get_outputs()[0].name
    prediction = onnx_model.run([output_name], {input_name: image_input})
    return prediction

# Streamlit interface
st.title("Emotion Recognition with ONNX")

uploaded_file = st.file_uploader("Upload an image", type=["jpg", "jpeg", "png"])

if uploaded_file is not None:
    image = Image.open(uploaded_file)
    st.image(image, caption="Uploaded Image", use_column_width=True)

    # Preprocess the image
    image_input = preprocess_image(image)

    # Predict the emotion
    emotion_prediction = predict_emotion_onnx(onnx_model, image_input)

    # Display the prediction
    st.write(f"Predicted Emotion: {emotion_prediction[0]}")