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from PIL import Image
import torch
import torch.nn.functional as F
import numpy as np
from roma.utils.utils import tensor_to_pil
from roma import roma_indoor
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
if __name__ == "__main__":
from argparse import ArgumentParser
parser = ArgumentParser()
parser.add_argument("--im_A_path", default="assets/sacre_coeur_A.jpg", type=str)
parser.add_argument("--im_B_path", default="assets/sacre_coeur_B.jpg", type=str)
parser.add_argument(
"--save_path", default="demo/dkmv3_warp_sacre_coeur.jpg", type=str
)
args, _ = parser.parse_known_args()
im1_path = args.im_A_path
im2_path = args.im_B_path
save_path = args.save_path
# Create model
roma_model = roma_indoor(device=device)
H, W = roma_model.get_output_resolution()
im1 = Image.open(im1_path).resize((W, H))
im2 = Image.open(im2_path).resize((W, H))
# Match
warp, certainty = roma_model.match(im1_path, im2_path, device=device)
# Sampling not needed, but can be done with model.sample(warp, certainty)
x1 = (torch.tensor(np.array(im1)) / 255).to(device).permute(2, 0, 1)
x2 = (torch.tensor(np.array(im2)) / 255).to(device).permute(2, 0, 1)
im2_transfer_rgb = F.grid_sample(
x2[None], warp[:, :W, 2:][None], mode="bilinear", align_corners=False
)[0]
im1_transfer_rgb = F.grid_sample(
x1[None], warp[:, W:, :2][None], mode="bilinear", align_corners=False
)[0]
warp_im = torch.cat((im2_transfer_rgb, im1_transfer_rgb), dim=2)
white_im = torch.ones((H, 2 * W), device=device)
vis_im = certainty * warp_im + (1 - certainty) * white_im
tensor_to_pil(vis_im, unnormalize=False).save(save_path)
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