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 torchvision.transforms.functional as tf
from utils.loss_utils import ssim

from skimage.metrics import structural_similarity


from lpipsPyTorch import lpips
import json
from tqdm import tqdm
from utils.image_utils import psnr
from argparse import ArgumentParser

def readImages(renders_dir, gt_dir):
    renders = []
    gts = []
    image_names = []
    for fname in os.listdir(renders_dir):
        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):

    full_dict = {}
    per_view_dict = {}
    full_dict_polytopeonly = {}
    per_view_dict_polytopeonly = {}
    print("")

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

        # for acc..
        test_dir = Path(scene_dir) / "eval"
        eval_dir = Path(scene_dir) / "eval"
        
        for test_dir in [eval_dir]:
            dataset = test_dir.stem
            for method in os.listdir(test_dir):
                print("Method:", method, dataset)

                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)

                ssims = []
                ssims_sk = []
                psnrs = []
                lpipss = []

                for idx in tqdm(range(len(renders)), desc="Metric evaluation progress", ascii=True, dynamic_ncols=True):
                    ssims.append(ssim(renders[idx], gts[idx]))
                    ssims_sk.append(structural_similarity(renders[idx][0].permute(1,2,0).cpu().numpy(), gts[idx][0].permute(1,2,0).cpu().numpy(), multichannel=True, channel_axis=2 ,data_range=1.0))
                    psnrs.append(psnr(renders[idx], gts[idx]))

                    # Following previous works to keep the range of RGB in [0, 1].  (however, may be a mistake : https://github.com/richzhang/PerceptualSimilarity) 
                    lpipss.append(lpips(renders[idx], gts[idx], net_type='vgg'))

                print("  SSIM : {:>12.7f}".format(torch.tensor(ssims).mean(), ".5"))
                print("  SSIM_sk : {:>12.7f}".format(torch.tensor(ssims_sk).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(),
                                                        "SSIM_sk": torch.tensor(ssims_sk).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)}})

            with open(scene_dir + "/results_{}.json".format(dataset), 'w') as fp:
                json.dump(full_dict[scene_dir], fp, indent=True)
            with open(scene_dir + "/per_view_{}.json".format(dataset), 'w') as fp:
                json.dump(per_view_dict[scene_dir], fp, indent=True)


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=[])
    args = parser.parse_args()
    evaluate(args.model_paths)