metrics.py

#
# Copyright (C) 2023, Inria
# GRAPHDECO research group, https://team.inria.fr/graphdeco
# All rights reserved.
#
# This software is free for non-commercial, research and evaluation use 
# under the terms of the LICENSE.md file.
#
# For inquiries contact  george.drettakis@inria.fr
#

from pathlib import Path
import os
from PIL import Image
import torch
import numpy as np
import torchvision.transforms.functional as tf
from utils.loss_utils import ssim
from lpipsPyTorch import lpips
import json
from tqdm import tqdm
from utils.image_utils import psnr, hist_match, color_correction
from argparse import ArgumentParser


def readImages(renders_dir, gt_dir, postfix):
    renders = []
    gts = []
    image_names = []
    for fname in os.listdir(gt_dir):
        if 'orig' in fname:
            continue
        if postfix != '':
            render = Image.open(renders_dir / fname.replace('.png', f'{postfix}.png'))
        else:
            render = Image.open(renders_dir / fname)
        gt = Image.open(gt_dir / fname)
        renders.append(tf.to_tensor(render).unsqueeze(0)[:, :3, :, :].cuda())
        gts.append(tf.to_tensor(gt).unsqueeze(0)[:, :3, :, :].cuda())
        image_names.append(fname)
    return renders, gts, image_names

def evaluate(model_paths, postfix, mask_path):

    full_dict = {}
    per_view_dict = {}
    full_dict_polytopeonly = {}
    per_view_dict_polytopeonly = {}
    print("")
    
    mask = None
    if len(mask_path) != 0:
        mask = np.array(Image.open(mask_path))
        mask = torch.tensor(mask).bool().cuda()

    for scene_dir in model_paths:
        try:
            print("Scene:", scene_dir)
            full_dict[scene_dir] = {}
            per_view_dict[scene_dir] = {}
            full_dict_polytopeonly[scene_dir] = {}
            per_view_dict_polytopeonly[scene_dir] = {}

            test_dir = Path(scene_dir) / "test"

            for method in os.listdir(test_dir):
                print("Method:", method)

                full_dict[scene_dir][method] = {}
                per_view_dict[scene_dir][method] = {}
                full_dict_polytopeonly[scene_dir][method] = {}
                per_view_dict_polytopeonly[scene_dir][method] = {}

                method_dir = test_dir / method
                gt_dir = method_dir/ "gt"
                renders_dir = method_dir / "renders"
                renders, gts, image_names = readImages(renders_dir, gt_dir, postfix)

                ssims = []
                psnrs = []
                lpipss = []
                for idx in tqdm(range(len(renders)), desc="Metric evaluation progress"):
                    rendered = renders[idx]
                    gt = gts[idx]
                    ssims.append(ssim(rendered, gt, mask=mask))
                    psnrs.append(psnr(rendered, gt, mask))
                    lpipss.append(lpips(rendered, gt, net_type='vgg', mask=mask))

                print("  SSIM : {:>12.7f}".format(torch.tensor(ssims).mean(), ".5"))
                print("  PSNR : {:>12.7f}".format(torch.tensor(psnrs).mean(), ".5"))
                print("  LPIPS: {:>12.7f}".format(torch.tensor(lpipss).mean(), ".5"))
                print("")

                full_dict[scene_dir][method].update({"SSIM": torch.tensor(ssims).mean().item(),
                                                        "PSNR": torch.tensor(psnrs).mean().item(),
                                                        "LPIPS": torch.tensor(lpipss).mean().item()})
                per_view_dict[scene_dir][method].update({"SSIM": {name: ssim for ssim, name in zip(torch.tensor(ssims).tolist(), image_names)},
                                                            "PSNR": {name: psnr for psnr, name in zip(torch.tensor(psnrs).tolist(), image_names)},
                                                            "LPIPS": {name: lp for lp, name in zip(torch.tensor(lpipss).tolist(), image_names)}})
            if len(mask_path) == 0:
                with open(scene_dir + "/results.json", 'w') as fp:
                    json.dump(full_dict[scene_dir], fp, indent=True)
                with open(scene_dir + "/per_view.json", 'w') as fp:
                    json.dump(per_view_dict[scene_dir], fp, indent=True)
            else:
                with open(scene_dir + "/masked_results.json", 'w') as fp:
                    json.dump(full_dict[scene_dir], fp, indent=True)
                with open(scene_dir + "/masked_per_view.json", 'w') as fp:
                    json.dump(per_view_dict[scene_dir], fp, indent=True)
        except Exception as e:
            print("Unable to compute metrics for model", scene_dir)
            print('Error: ', e)
            raise e

if __name__ == "__main__":
    device = torch.device("cuda:0")
    torch.cuda.set_device(device)

    # Set up command line argument parser
    parser = ArgumentParser(description="Training script parameters")
    parser.add_argument('--model_paths', '-m', required=True, nargs="+", type=str, default=[])
    parser.add_argument('--postfix', '-p', required=False, type=str, default='')
    parser.add_argument('--mask', required=False, type=str, default='')
    args = parser.parse_args()
    evaluate(args.model_paths, args.postfix, args.mask)