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# Copyright (c) 2020, NVIDIA CORPORATION. All rights reserved.
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# FLIP: A Difference Evaluator for Alternating Images
# High Performance Graphics, 2020.
# by Pontus Andersson, Jim Nilsson, Tomas Akenine-Moller, Magnus Oskarsson, Kalle Astrom, and Mark D. Fairchild
#
# Pointer to our paper: https://research.nvidia.com/publication/2020-07_FLIP
# code by Pontus Andersson, Jim Nilsson, and Tomas Akenine-Moller
import numpy as np
from flip import compute_flip
from utils import *
if __name__ == '__main__':
# Set viewing conditions
monitor_distance = 0.7
monitor_width = 0.7
monitor_resolution_x = 3840
# Compute number of pixels per degree of visual angle
pixels_per_degree = monitor_distance * (monitor_resolution_x / monitor_width) * (np.pi / 180)
# Load sRGB images
reference = load_image_array('../images/reference.png')
test = load_image_array('../images/test.png')
# Compute FLIP map
deltaE = compute_flip(reference, test, pixels_per_degree)
# Save error map
index_map = np.floor(255.0 * deltaE.squeeze(0))
use_color_map = True
if use_color_map:
result = CHWtoHWC(index2color(index_map, get_magma_map()))
else:
result = index_map / 255.0
save_image("../images/flip.png", result)
print("Done")
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