enc_photon_noise_test.cc (1516B)
1 // Copyright (c) the JPEG XL Project Authors. All rights reserved. 2 // 3 // Use of this source code is governed by a BSD-style 4 // license that can be found in the LICENSE file. 5 6 #include "lib/jxl/enc_photon_noise.h" 7 8 #include "lib/jxl/noise.h" 9 #include "lib/jxl/testing.h" 10 11 namespace jxl { 12 namespace { 13 14 TEST(EncPhotonNoiseTest, LUTs) { 15 const double kTolerance = 1e-6; 16 EXPECT_ARRAY_NEAR( 17 SimulatePhotonNoise(/*xsize=*/6000, /*ysize=*/4000, /*iso=*/100).lut, 18 (NoiseParams::Lut{0.00259652, 0.0139648, 0.00681551, 0.00632582, 19 0.00694917, 0.00803922, 0.00934574, 0.0107607}), 20 kTolerance); 21 EXPECT_ARRAY_NEAR( 22 SimulatePhotonNoise(/*xsize=*/6000, /*ysize=*/4000, /*iso=*/800).lut, 23 (NoiseParams::Lut{0.02077220, 0.0420923, 0.01820690, 0.01439020, 24 0.01293670, 0.01254030, 0.01277390, 0.0134161}), 25 kTolerance); 26 EXPECT_ARRAY_NEAR( 27 SimulatePhotonNoise(/*xsize=*/6000, /*ysize=*/4000, /*iso=*/6400).lut, 28 (NoiseParams::Lut{0.1661770, 0.1691120, 0.05309080, 0.03963960, 29 0.03357410, 0.03001650, 0.02776740, 0.0263478}), 30 kTolerance); 31 32 // Lower when measured on a per-pixel basis as there are fewer of them. 33 EXPECT_ARRAY_NEAR( 34 SimulatePhotonNoise(/*xsize=*/4000, /*ysize=*/3000, /*iso=*/6400).lut, 35 (NoiseParams::Lut{0.0830886, 0.1008720, 0.0367748, 0.0280305, 0.0240236, 36 0.0218040, 0.0205771, 0.0200058}), 37 kTolerance); 38 } 39 40 } // namespace 41 } // namespace jxl