app.py

import streamlit as st
import os
from PIL import Image
from torchvision.models import vgg19
from model import StyleTransferModel
from trainer import trainer_fn
from utils import process_image, tensor_to_image


base_model = vgg19(pretrained=True).features
final_model = StyleTransferModel(base_model)

# define the title of the app
st.title('Style Transfer App')

# define the description of the app
st.write('This app applies the style of one image to another image. This can be used to create artistic images.')

# get all image files in the 'styles' folder
image_files = [f for f in os.listdir('styles') if f.lower().endswith(('png', 'jpg', 'jpeg', 'gif', 'bmp'))]

# display the images
st.write('Select style art to apply into your image:')

# Check how many images are available and set columns accordingly
num_images = len(image_files)
cols = st.columns(num_images)

# Define the size to which the images will be resized (width, height)
resize_width = 300
resize_height = 300

# show each image in a corresponding column
for idx, img_file in enumerate(image_files):
    with cols[idx]:
        st.write(f"Style {idx + 1}")
        img_path = f'styles/{img_file}'
        img = Image.open(img_path)
        
        # Redimensionar la imagen
        img_resized = img.resize((resize_width, resize_height))
        
        st.image(img_resized, use_container_width=True)

# create a file uploader for the content image
st.write('Upload the content image:')
content_image = st.file_uploader('Content Image', type=['jpg', 'jpeg'])

# create the botton to select the style image between 1, 2, and 3
choice = st.selectbox('Select the style art:', [f'Style {i + 1}' for i in range(num_images)])

# create a button to run the model
if st.button('Apply Style Transfer'):
    if content_image is not None:
        # get the content image
        content_img = Image.open(content_image)
    
        # get the style image
        style_choice = choice.split()[-1]  # Extract style number from "Style 1", "Style 2", etc.
        style_img = Image.open(os.path.join('styles', image_files[int(style_choice) - 1]))  # Get full path

        # preprocess the images
        content_img = process_image(content_img)
        style_img = process_image(style_img)

        # run the model
        st.write('Applying Style Transfer...')
        target_image = trainer_fn(
            content_img, style_img, content_img.clone().requires_grad_(True), final_model
        )

        # convert the tensor to image
        target_image = tensor_to_image(target_image.squeeze(0))

        # display the result
        st.write('Result:')
        st.image(target_image, use_container_width=True)
    else:
        st.write('Please upload a content image')