test_simple.py

from __future__ import absolute_import, division, print_function

import os
import glob
import argparse
import numpy as np
import PIL.Image as pil
import matplotlib as mpl
import matplotlib.cm as cm

import torch
from torchvision import transforms, datasets

import networks
from layers import disp_to_depth
from evaluate_depth import STEREO_SCALE_FACTOR


def parse_args():
    parser = argparse.ArgumentParser(
        description='Simple testing funtion for Monodepthv2 models.')

    parser.add_argument('--image_path', type=str,
                        help='path to a test image or folder of images', required=True)
    parser.add_argument('--model_path', type=str,
                        help='path of a pretrained model to use', required=True)
    parser.add_argument('--ext', type=str,
                        help='image extension to search for in folder', default="jpg")
    parser.add_argument("--no_cuda",
                        help='if set, disables CUDA',
                        action='store_true')
    parser.add_argument("--pred_metric_depth",
                        help='if set, predicts metric depth instead of disparity. (This only '
                             'makes sense for stereo-trained KITTI models).',
                        action='store_true')

    return parser.parse_args()


def test_simple(args):
    """Function to predict for a single image or folder of images
    """

    if torch.cuda.is_available() and not args.no_cuda:
        device = torch.device("cuda")
    else:
        device = torch.device("cpu")

    if args.pred_metric_depth and "stereo" not in args.model_name:
        print("Warning: The --pred_metric_depth flag only makes sense for stereo-trained KITTI "
              "models. For mono-trained models, output depths will not in metric space.")

    print("-> Loading model from ", args.model_path)
    encoder_path = os.path.join(args.model_path, "encoder.pth")
    depth_decoder_path = os.path.join(args.model_path, "depth.pth")

    # LOADING PRETRAINED MODEL
    print("   Loading pretrained encoder")
    encoder = networks.ResnetEncoder(18, False)
    loaded_dict_enc = torch.load(encoder_path, map_location=device)

    # extract the height and width of image that this model was trained with
    feed_height = loaded_dict_enc['height']
    feed_width = loaded_dict_enc['width']
    filtered_dict_enc = {k: v for k, v in loaded_dict_enc.items() if k in encoder.state_dict()}
    encoder.load_state_dict(filtered_dict_enc)
    encoder.to(device)
    encoder.eval()

    print("   Loading pretrained decoder")
    depth_decoder = networks.DepthDecoder(
        num_ch_enc=encoder.num_ch_enc, scales=range(4))

    loaded_dict = torch.load(depth_decoder_path, map_location=device)
    depth_decoder.load_state_dict(loaded_dict)

    depth_decoder.to(device)
    depth_decoder.eval()

    # FINDING INPUT IMAGES
    if os.path.isfile(args.image_path):
        # Only testing on a single image
        paths = [args.image_path]
        output_directory = os.path.dirname(args.image_path)
    elif os.path.isdir(args.image_path):
        # Searching folder for images
        paths = glob.glob(os.path.join(args.image_path, '*.{}'.format(args.ext)))
        output_directory = args.image_path
    else:
        raise Exception("Can not find args.image_path: {}".format(args.image_path))

    print("-> Predicting on {:d} test images".format(len(paths)))

    # PREDICTING ON EACH IMAGE IN TURN
    with torch.no_grad():
        for idx, image_path in enumerate(paths):

            if image_path.endswith("_disp.jpg"):
                # don't try to predict disparity for a disparity image!
                continue

            # Load image and preprocess
            input_image = pil.open(image_path).convert('RGB')
            original_width, original_height = input_image.size
            input_image = input_image.resize((feed_width, feed_height), pil.LANCZOS)
            input_image = transforms.ToTensor()(input_image).unsqueeze(0)

            # PREDICTION
            input_image = input_image.to(device)
            features = encoder(input_image)
            outputs = depth_decoder(features)

            disp = outputs[("disp", 0)]
            disp_resized = torch.nn.functional.interpolate(
                disp, (original_height, original_width), mode="bilinear", align_corners=False)

            # Saving numpy file
            output_name = os.path.splitext(os.path.basename(image_path))[0]
            scaled_disp, depth = disp_to_depth(disp, 0.1, 100)
            if args.pred_metric_depth:
                name_dest_npy = os.path.join(output_directory, "{}_depth.npy".format(output_name))
                metric_depth = STEREO_SCALE_FACTOR * depth.cpu().numpy()
                np.save(name_dest_npy, metric_depth)
            else:
                name_dest_npy = os.path.join(output_directory, "{}_disp.npy".format(output_name))
                np.save(name_dest_npy, scaled_disp.cpu().numpy())

            # Saving colormapped depth image
            disp_resized_np = disp_resized.squeeze().cpu().numpy()
            vmax = np.percentile(disp_resized_np, 95)
            normalizer = mpl.colors.Normalize(vmin=disp_resized_np.min(), vmax=vmax)
            mapper = cm.ScalarMappable(norm=normalizer, cmap='magma')
            colormapped_im = (mapper.to_rgba(disp_resized_np)[:, :, :3] * 255).astype(np.uint8)
            im = pil.fromarray(colormapped_im)

            name_dest_im = os.path.join(output_directory, "{}_disp.jpeg".format(output_name))
            im.save(name_dest_im)

            print("   Processed {:d} of {:d} images - saved predictions to:".format(
                idx + 1, len(paths)))
            print("   - {}".format(name_dest_im))
            print("   - {}".format(name_dest_npy))

    print('-> Done!')


if __name__ == '__main__':
    args = parse_args()
    test_simple(args)