app.py

import gradio as gr

import cv2

import torch

import matplotlib.pyplot as plt
from matplotlib import cm
from matplotlib import colors
from mpl_toolkits.axes_grid1 import ImageGrid

from torchvision import transforms

import fire_network

import numpy as np



from PIL import Image

# Possible Scales for multiscale inference
scales = [2.0, 1.414, 1.0, 0.707, 0.5, 0.353, 0.25] 

device = 'cpu'

# Load net
state = torch.load('fire.pth', map_location='cpu')
state['net_params']['pretrained'] = None # no need for imagenet pretrained model
net = fire_network.init_network(**state['net_params']).to(device)
net.load_state_dict(state['state_dict'])

transform = transforms.Compose([
        transforms.Resize(1024),
        transforms.ToTensor(), 
        transforms.Normalize(**dict(zip(["mean", "std"], net.runtime['mean_std'])))
        ])


# which sf
sf_idx_ = [55, 14, 5, 4, 52, 57, 40, 9]

col = plt.get_cmap('tab10')

def generate_matching_superfeatures(im1, im2, scale_id=6, threshold=50):

    im1_tensor = transform(im1).unsqueeze(0)
    im2_tensor = transform(im2).unsqueeze(0)

    im1_cv = cv2.imread(im1)
    im2_cv = cv2.imread(im2)

    # extract features
    with torch.no_grad():
        output1 = net.get_superfeatures(im1_tensor.to(device), scales=[scale_id])
        feats1 = output1[0][0]
        attns1 = output1[1][0]
        strenghts1 = output1[2][0]

        output2 = net.get_superfeatures(im2_tensor.to(device), scales=[scale_id])
        feats2 = output2[0][0]
        attns2 = output2[1][0]
        strenghts2 = output2[2][0]

    print(feats1.shape, feats2.shape)
    print(attns1.shape, attns2.shape)
    print(strenghts1.shape, strenghts2.shape)
    
    # Store all binary SF att maps to show them all at once in the end
    all_att_bin1 = []
    all_att_bin2 = []
    for n, i in enumerate(sf_idx_):
        # all_atts[n].append(attn[j][scale_id][0,i,:,:].numpy())
        att_heat = np.array(attns1[0,i,:,:].numpy(), dtype=np.float32)
        att_heat = np.uint8(att_heat / np.max(att_heat[:]) * 255.0)
        att_heat_bin  = np.where(att_heat>threshold, 255, 0)
        all_att_bin1.append(att_heat_bin)

        att_heat = np.array(attns2[0,i,:,:].numpy(), dtype=np.float32)
        att_heat = np.uint8(att_heat / np.max(att_heat[:]) * 255.0)
        att_heat_bin  = np.where(att_heat>threshold, 255, 0)
        all_att_bin2.append(att_heat_bin)

    
    fin_img = []
    img1rsz = np.copy(im1_cv)
    print(img1rsz.size)
    for j, att in enumerate(all_att_bin1):
        att = cv2.resize(att, im1.size, interpolation=cv2.INTER_NEAREST)
        # att = cv2.resize(att, imgz[i].shape[:2][::-1], interpolation=cv2.INTER_CUBIC)
        # att = cv2.resize(att, imgz[i].shape[:2][::-1])
        # att = att.resize(shape)
        # att = resize(att, im1.size)
        mask2d = zip(*np.where(att==255))
        for m,n in mask2d:
            col_ = col.colors[j] if j < 7 else col.colors[j+1]
            if j == 0: col_ = col.colors[9]
            col_ = 255*np.array(colors.to_rgba(col_))[:3]
            img1rsz[m,n, :] = col_[::-1]   
    fin_img.append(img1rsz)
            
    img2rsz = np.copy(im1_cv)
    for j, att in enumerate(all_att_bin2):
        att = cv2.resize(att, im2.size, interpolation=cv2.INTER_NEAREST)
        # att = cv2.resize(att, imgz[i].shape[:2][::-1], interpolation=cv2.INTER_CUBIC)
        # # att = cv2.resize(att, imgz[i].shape[:2][::-1])
        # att = att.resize(im2.shape)
        # print('att:', att.shape)
        mask2d = zip(*np.where(att==255))
        for m,n in mask2d:
            col_ = col.colors[j] if j < 7 else col.colors[j+1]
            if j == 0: col_ = col.colors[9]
            col_ = 255*np.array(colors.to_rgba(col_))[:3]
            img2rsz[m,n, :] = col_[::-1]   
    fin_img.append(img2rsz)
    

    fig = plt.figure(figsize=(12,25))
    grid = ImageGrid(fig, 111, nrows_ncols=(2, 1),  axes_pad=0.1)
    for ax, img in zip(grid, fin_img):
        ax.imshow(cv2.cvtColor(img, cv2.COLOR_BGR2RGB))
        ax.axis('scaled')
        ax.axis('off')
    plt.tight_layout()
    fig.suptitle("Matching SFs", fontsize=16)
    return fig


# GRADIO APP
title = "Visualizing Super-features"
description = "TBD"
article = "<p style='text-align: center'><a href='https://github.com/naver/fire' target='_blank'>Original Github Repo</a></p>"


iface = gr.Interface(
    fn=generate_matching_superfeatures,
    inputs=[
        gr.inputs.Image(shape=(1024, 1024), type="pil"),
        gr.inputs.Image(shape=(1024, 1024), type="pil"),
        gr.inputs.Slider(minimum=1, maximum=7, step=1, default=2, label="Scale"),
        gr.inputs.Slider(minimum=1, maximum=255, step=25, default=50, label="Binarizatio Threshold")],
    # outputs="plot",
    outputs=gr.outputs.Image(shape=(1024,2048), type="plot"),
    enable_queue=True,
    title=title,
    description=description,
    article=article,
    examples=[["chateau_1.png", "chateau_2.png", 6, 50]],
)
iface.launch()