import argparse import logging import os import numpy as np import torch from PIL import Image from torchvision import transforms import torch.nn.functional as F from unet import UNet from utils import plot_img_and_mask from utils.dataset import BasicDataset def predict_img(net, full_img, device, scale_factor=1, out_threshold=0.5, use_dense_crf=False): net.eval() ds = BasicDataset('', '', scale=scale_factor) img = ds.preprocess(full_img) img = img.unsqueeze(0) img = img.to(device=device, dtype=torch.float32) with torch.no_grad(): output = net(img) if net.n_classes > 1: probs = F.softmax(output, dim=1) else: probs = torch.sigmoid(output) probs = probs.squeeze(0) tf = transforms.Compose( [ transforms.ToPILImage(), transforms.Resize(full_img.shape[1]), transforms.ToTensor() ] ) probs = tf(probs.cpu()) full_mask = probs.squeeze().cpu().numpy() if use_dense_crf: full_mask = dense_crf(np.array(full_img).astype(np.uint8), full_mask) return full_mask > out_threshold def get_args(): parser = argparse.ArgumentParser(description='Predict masks from input images', formatter_class=argparse.ArgumentDefaultsHelpFormatter) parser.add_argument('--model', '-m', default='MODEL.pth', metavar='FILE', help="Specify the file in which the model is stored") parser.add_argument('--input', '-i', metavar='INPUT', nargs='+', help='filenames of input images', required=True) parser.add_argument('--output', '-o', metavar='INPUT', nargs='+', help='Filenames of ouput images') parser.add_argument('--viz', '-v', action='store_true', help="Visualize the images as they are processed", default=False) parser.add_argument('--no-save', '-n', action='store_true', help="Do not save the output masks", default=False) parser.add_argument('--mask-threshold', '-t', type=float, help="Minimum probability value to consider a mask pixel white", default=0.5) parser.add_argument('--scale', '-s', type=float, help="Scale factor for the input images", default=0.5) return parser.parse_args() def get_output_filenames(args): in_files = args.input out_files = [] if not args.output: for f in in_files: pathsplit = os.path.splitext(f) out_files.append("{}_OUT{}".format(pathsplit[0], pathsplit[1])) elif len(in_files) != len(args.output): logging.error("Input files and output files are not of the same length") raise SystemExit() else: out_files = args.output return out_files def mask_to_image(mask): return Image.fromarray((mask * 255).astype(np.uint8)) if __name__ == "__main__": args = get_args() in_files = args.input out_files = get_output_filenames(args) net = UNet(n_channels=3, n_classes=1) logging.info("Loading model {}".format(args.model)) device = torch.device('cuda' if torch.cuda.is_available() else 'cpu') logging.info(f'Using device {device}') net.to(device=device) net.load_state_dict(torch.load(args.model, map_location=device)) logging.info("Model loaded !") for i, fn in enumerate(in_files): logging.info("\nPredicting image {} ...".format(fn)) img = Image.open(fn) mask = predict_img(net=net, full_img=img, scale_factor=args.scale, out_threshold=args.mask_threshold, use_dense_crf=False, device=device) if not args.no_save: out_fn = out_files[i] result = mask_to_image(mask) result.save(out_files[i]) logging.info("Mask saved to {}".format(out_files[i])) if args.viz: logging.info("Visualizing results for image {}, close to continue ...".format(fn)) plot_img_and_mask(img, mask)