-// Unit tests for YCbCrInput.
-// FIXME: This class really ought to support mipmaps.
+// Unit tests for YCbCrInput. Also tests the matrix functions in ycbcr.cpp directly.
-#include "test_util.h"
+#include <epoxy/gl.h>
+#include <stddef.h>
+
+#include <Eigen/Core>
+#include <Eigen/LU>
+
+#include "effect_chain.h"
#include "gtest/gtest.h"
+#include "test_util.h"
+#include "util.h"
+#include "resource_pool.h"
#include "ycbcr_input.h"
-TEST(YCbCrInput, Simple444) {
+namespace movit {
+
+TEST(YCbCrInputTest, Simple444) {
const int width = 1;
const int height = 5;
YCbCrFormat ycbcr_format;
ycbcr_format.luma_coefficients = YCBCR_REC_601;
ycbcr_format.full_range = false;
+ ycbcr_format.num_levels = 256;
ycbcr_format.chroma_subsampling_x = 1;
ycbcr_format.chroma_subsampling_y = 1;
- ycbcr_format.chroma_x_position = 0.5f;
- ycbcr_format.chroma_y_position = 0.5f;
+ ycbcr_format.cb_x_position = 0.5f;
+ ycbcr_format.cb_y_position = 0.5f;
+ ycbcr_format.cr_x_position = 0.5f;
+ ycbcr_format.cr_y_position = 0.5f;
YCbCrInput *input = new YCbCrInput(format, ycbcr_format, width, height);
input->set_pixel_data(0, y);
expect_equal(expected_data, out_data, 4 * width, height, 0.025, 0.002);
}
-TEST(YCbCrInput, FullRangeRec601) {
+TEST(YCbCrInputTest, FullRangeRec601) {
const int width = 1;
const int height = 5;
YCbCrFormat ycbcr_format;
ycbcr_format.luma_coefficients = YCBCR_REC_601;
ycbcr_format.full_range = true;
+ ycbcr_format.num_levels = 256;
ycbcr_format.chroma_subsampling_x = 1;
ycbcr_format.chroma_subsampling_y = 1;
- ycbcr_format.chroma_x_position = 0.5f;
- ycbcr_format.chroma_y_position = 0.5f;
+ ycbcr_format.cb_x_position = 0.5f;
+ ycbcr_format.cb_y_position = 0.5f;
+ ycbcr_format.cr_x_position = 0.5f;
+ ycbcr_format.cr_y_position = 0.5f;
YCbCrInput *input = new YCbCrInput(format, ycbcr_format, width, height);
input->set_pixel_data(0, y);
// so we need some leeway.
expect_equal(expected_data, out_data, 4 * width, height, 0.025, 0.002);
}
+
+TEST(YCbCrInputTest, Rec709) {
+ const int width = 1;
+ const int height = 5;
+
+ // Pure-color test inputs, calculated with the formulas in Rec. 709
+ // page 19, items 3.4 and 3.5.
+ unsigned char y[width * height] = {
+ 16, 235, 63, 173, 32,
+ };
+ unsigned char cb[width * height] = {
+ 128, 128, 102, 42, 240,
+ };
+ unsigned char cr[width * height] = {
+ 128, 128, 240, 26, 118,
+ };
+ float expected_data[4 * width * height] = {
+ 0.0, 0.0, 0.0, 1.0,
+ 1.0, 1.0, 1.0, 1.0,
+ 1.0, 0.0, 0.0, 1.0,
+ 0.0, 1.0, 0.0, 1.0,
+ 0.0, 0.0, 1.0, 1.0,
+ };
+ float out_data[4 * width * height];
+
+ EffectChainTester tester(NULL, width, height);
+
+ ImageFormat format;
+ format.color_space = COLORSPACE_sRGB;
+ format.gamma_curve = GAMMA_sRGB;
+
+ YCbCrFormat ycbcr_format;
+ ycbcr_format.luma_coefficients = YCBCR_REC_709;
+ ycbcr_format.full_range = false;
+ ycbcr_format.num_levels = 256;
+ ycbcr_format.chroma_subsampling_x = 1;
+ ycbcr_format.chroma_subsampling_y = 1;
+ ycbcr_format.cb_x_position = 0.5f;
+ ycbcr_format.cb_y_position = 0.5f;
+ ycbcr_format.cr_x_position = 0.5f;
+ ycbcr_format.cr_y_position = 0.5f;
+
+ YCbCrInput *input = new YCbCrInput(format, ycbcr_format, width, height);
+ input->set_pixel_data(0, y);
+ input->set_pixel_data(1, cb);
+ input->set_pixel_data(2, cr);
+ tester.get_chain()->add_input(input);
+
+ tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_sRGB);
+
+ // Y'CbCr isn't 100% accurate (the input values are rounded),
+ // so we need some leeway.
+ expect_equal(expected_data, out_data, 4 * width, height, 0.025, 0.002);
+}
+
+TEST(YCbCrInputTest, Rec2020) {
+ const int width = 1;
+ const int height = 5;
+
+ // Pure-color test inputs, calculated with the formulas in Rec. 2020
+ // page 4, tables 4 and 5 (for conventional non-constant luminance).
+ // Note that we still use 8-bit inputs, even though Rec. 2020 is only
+ // defined for 10- and 12-bit.
+ unsigned char y[width * height] = {
+ 16, 235, 74, 164, 29,
+ };
+ unsigned char cb[width * height] = {
+ 128, 128, 97, 47, 240,
+ };
+ unsigned char cr[width * height] = {
+ 128, 128, 240, 25, 119,
+ };
+ float expected_data[4 * width * height] = {
+ 0.0, 0.0, 0.0, 1.0,
+ 1.0, 1.0, 1.0, 1.0,
+ 1.0, 0.0, 0.0, 1.0,
+ 0.0, 1.0, 0.0, 1.0,
+ 0.0, 0.0, 1.0, 1.0,
+ };
+ float out_data[4 * width * height];
+
+ EffectChainTester tester(NULL, width, height);
+
+ ImageFormat format;
+ format.color_space = COLORSPACE_sRGB;
+ format.gamma_curve = GAMMA_sRGB;
+
+ YCbCrFormat ycbcr_format;
+ ycbcr_format.luma_coefficients = YCBCR_REC_2020;
+ ycbcr_format.full_range = false;
+ ycbcr_format.num_levels = 256;
+ ycbcr_format.chroma_subsampling_x = 1;
+ ycbcr_format.chroma_subsampling_y = 1;
+ ycbcr_format.cb_x_position = 0.5f;
+ ycbcr_format.cb_y_position = 0.5f;
+ ycbcr_format.cr_x_position = 0.5f;
+ ycbcr_format.cr_y_position = 0.5f;
+
+ YCbCrInput *input = new YCbCrInput(format, ycbcr_format, width, height);
+ input->set_pixel_data(0, y);
+ input->set_pixel_data(1, cb);
+ input->set_pixel_data(2, cr);
+ tester.get_chain()->add_input(input);
+
+ tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_sRGB);
+
+ // Y'CbCr isn't 100% accurate (the input values are rounded),
+ // so we need some leeway.
+ expect_equal(expected_data, out_data, 4 * width, height, 0.025, 0.002);
+}
+
+TEST(YCbCrInputTest, Subsampling420) {
+ const int width = 4;
+ const int height = 4;
+
+ unsigned char y[width * height] = {
+ 126, 126, 126, 126,
+ 126, 126, 126, 126,
+ 126, 126, 126, 126,
+ 126, 126, 126, 126,
+ };
+ unsigned char cb[(width/2) * (height/2)] = {
+ 64, 128,
+ 128, 192,
+ };
+ unsigned char cr[(width/2) * (height/2)] = {
+ 128, 128,
+ 128, 128,
+ };
+
+ // Note: This is only the blue channel. The chroma samples (with associated
+ // values for blue) are marked off in comments.
+ float expected_data[width * height] = {
+ 0.000, 0.125, 0.375, 0.500,
+ /* 0.0 */ /* 0.5 */
+ 0.125, 0.250, 0.500, 0.625,
+
+ 0.375, 0.500, 0.750, 0.875,
+ /* 0.5 */ /* 1.0 */
+ 0.500, 0.625, 0.875, 1.000,
+ };
+ float out_data[width * height];
+
+ EffectChainTester tester(NULL, width, height);
+
+ ImageFormat format;
+ format.color_space = COLORSPACE_sRGB;
+ format.gamma_curve = GAMMA_sRGB;
+
+ YCbCrFormat ycbcr_format;
+ ycbcr_format.luma_coefficients = YCBCR_REC_601;
+ ycbcr_format.full_range = false;
+ ycbcr_format.num_levels = 256;
+ ycbcr_format.chroma_subsampling_x = 2;
+ ycbcr_format.chroma_subsampling_y = 2;
+ ycbcr_format.cb_x_position = 0.5f;
+ ycbcr_format.cb_y_position = 0.5f;
+ ycbcr_format.cr_x_position = 0.5f;
+ ycbcr_format.cr_y_position = 0.5f;
+
+ YCbCrInput *input = new YCbCrInput(format, ycbcr_format, width, height);
+ input->set_pixel_data(0, y);
+ input->set_pixel_data(1, cb);
+ input->set_pixel_data(2, cr);
+ tester.get_chain()->add_input(input);
+
+ tester.run(out_data, GL_BLUE, COLORSPACE_sRGB, GAMMA_sRGB);
+
+ // Y'CbCr isn't 100% accurate (the input values are rounded),
+ // so we need some leeway.
+ expect_equal(expected_data, out_data, width, height, 0.01, 0.001);
+}
+
+TEST(YCbCrInputTest, Subsampling420WithNonCenteredSamples) {
+ const int width = 4;
+ const int height = 4;
+
+ unsigned char y[width * height] = {
+ 126, 126, 126, 126,
+ 126, 126, 126, 126,
+ 126, 126, 126, 126,
+ 126, 126, 126, 126,
+ };
+ unsigned char cb[(width/2) * (height/2)] = {
+ 64, 128,
+ 128, 192,
+ };
+ unsigned char cr[(width/2) * (height/2)] = {
+ 128, 128,
+ 128, 128,
+ };
+
+ // Note: This is only the blue channel. The chroma samples (with associated
+ // values for blue) are marked off in comments.
+ float expected_data[width * height] = {
+ 0.000, 0.250, 0.500, 0.500,
+ /* 0.0 */ /* 0.5 */
+ 0.125, 0.375, 0.625, 0.625,
+
+ 0.375, 0.625, 0.875, 0.875,
+ /* 0.5 */ /* 1.0 */
+ 0.500, 0.750, 1.000, 1.000,
+ };
+ float out_data[width * height];
+
+ EffectChainTester tester(NULL, width, height);
+
+ ImageFormat format;
+ format.color_space = COLORSPACE_sRGB;
+ format.gamma_curve = GAMMA_sRGB;
+
+ YCbCrFormat ycbcr_format;
+ ycbcr_format.luma_coefficients = YCBCR_REC_601;
+ ycbcr_format.full_range = false;
+ ycbcr_format.num_levels = 256;
+ ycbcr_format.chroma_subsampling_x = 2;
+ ycbcr_format.chroma_subsampling_y = 2;
+ ycbcr_format.cb_x_position = 0.0f;
+ ycbcr_format.cb_y_position = 0.5f;
+ ycbcr_format.cr_x_position = 0.0f;
+ ycbcr_format.cr_y_position = 0.5f;
+
+ YCbCrInput *input = new YCbCrInput(format, ycbcr_format, width, height);
+ input->set_pixel_data(0, y);
+ input->set_pixel_data(1, cb);
+ input->set_pixel_data(2, cr);
+ tester.get_chain()->add_input(input);
+
+ tester.run(out_data, GL_BLUE, COLORSPACE_sRGB, GAMMA_sRGB);
+
+ // Y'CbCr isn't 100% accurate (the input values are rounded),
+ // so we need some leeway.
+ expect_equal(expected_data, out_data, width, height, 0.01, 0.0012);
+}
+
+// Yes, some 4:2:2 formats actually have this craziness.
+TEST(YCbCrInputTest, DifferentCbAndCrPositioning) {
+ const int width = 4;
+ const int height = 4;
+
+ unsigned char y[width * height] = {
+ 126, 126, 126, 126,
+ 126, 126, 126, 126,
+ 126, 126, 126, 126,
+ 126, 126, 126, 126,
+ };
+ unsigned char cb[(width/2) * height] = {
+ 64, 128,
+ 128, 192,
+ 128, 128,
+ 128, 128,
+ };
+ unsigned char cr[(width/2) * height] = {
+ 48, 128,
+ 128, 208,
+ 128, 128,
+ 128, 128,
+ };
+
+ // Chroma samples in this csae are always co-sited with a luma sample;
+ // their associated color values and position are marked off in comments.
+ float expected_data_blue[width * height] = {
+ 0.000 /* 0.0 */, 0.250, 0.500 /* 0.5 */, 0.500,
+ 0.500 /* 0.5 */, 0.750, 1.000 /* 1.0 */, 1.000,
+ 0.500 /* 0.5 */, 0.500, 0.500 /* 0.5 */, 0.500,
+ 0.500 /* 0.5 */, 0.500, 0.500 /* 0.5 */, 0.500,
+ };
+ float expected_data_red[width * height] = {
+ 0.000, 0.000 /* 0.0 */, 0.250, 0.500 /* 0.5 */,
+ 0.500, 0.500 /* 0.5 */, 0.750, 1.000 /* 1.0 */,
+ 0.500, 0.500 /* 0.5 */, 0.500, 0.500 /* 0.5 */,
+ 0.500, 0.500 /* 0.5 */, 0.500, 0.500 /* 0.5 */,
+ };
+ float out_data[width * height];
+
+ EffectChainTester tester(NULL, width, height);
+
+ ImageFormat format;
+ format.color_space = COLORSPACE_sRGB;
+ format.gamma_curve = GAMMA_sRGB;
+
+ YCbCrFormat ycbcr_format;
+ ycbcr_format.luma_coefficients = YCBCR_REC_601;
+ ycbcr_format.full_range = false;
+ ycbcr_format.num_levels = 256;
+ ycbcr_format.chroma_subsampling_x = 2;
+ ycbcr_format.chroma_subsampling_y = 1;
+ ycbcr_format.cb_x_position = 0.0f;
+ ycbcr_format.cb_y_position = 0.5f;
+ ycbcr_format.cr_x_position = 1.0f;
+ ycbcr_format.cr_y_position = 0.5f;
+
+ YCbCrInput *input = new YCbCrInput(format, ycbcr_format, width, height);
+ input->set_pixel_data(0, y);
+ input->set_pixel_data(1, cb);
+ input->set_pixel_data(2, cr);
+ tester.get_chain()->add_input(input);
+
+ // Y'CbCr isn't 100% accurate (the input values are rounded),
+ // so we need some leeway.
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_sRGB);
+ expect_equal(expected_data_red, out_data, width, height, 0.02, 0.002);
+
+ tester.run(out_data, GL_BLUE, COLORSPACE_sRGB, GAMMA_sRGB);
+ expect_equal(expected_data_blue, out_data, width, height, 0.01, 0.001);
+}
+
+TEST(YCbCrInputTest, PBO) {
+ const int width = 1;
+ const int height = 5;
+
+ // Pure-color test inputs, calculated with the formulas in Rec. 601
+ // section 2.5.4.
+ unsigned char data[width * height * 3] = {
+ 16, 235, 81, 145, 41,
+ 128, 128, 90, 54, 240,
+ 128, 128, 240, 34, 110,
+ };
+ float expected_data[4 * width * height] = {
+ 0.0, 0.0, 0.0, 1.0,
+ 1.0, 1.0, 1.0, 1.0,
+ 1.0, 0.0, 0.0, 1.0,
+ 0.0, 1.0, 0.0, 1.0,
+ 0.0, 0.0, 1.0, 1.0,
+ };
+ float out_data[4 * width * height];
+
+ GLuint pbo;
+ glGenBuffers(1, &pbo);
+ glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
+ glBufferData(GL_PIXEL_UNPACK_BUFFER_ARB, width * height * 3, data, GL_STREAM_DRAW);
+ glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
+
+ EffectChainTester tester(NULL, width, height);
+
+ ImageFormat format;
+ format.color_space = COLORSPACE_sRGB;
+ format.gamma_curve = GAMMA_sRGB;
+
+ YCbCrFormat ycbcr_format;
+ ycbcr_format.luma_coefficients = YCBCR_REC_601;
+ ycbcr_format.full_range = false;
+ ycbcr_format.num_levels = 256;
+ ycbcr_format.chroma_subsampling_x = 1;
+ ycbcr_format.chroma_subsampling_y = 1;
+ ycbcr_format.cb_x_position = 0.5f;
+ ycbcr_format.cb_y_position = 0.5f;
+ ycbcr_format.cr_x_position = 0.5f;
+ ycbcr_format.cr_y_position = 0.5f;
+
+ YCbCrInput *input = new YCbCrInput(format, ycbcr_format, width, height);
+ input->set_pixel_data(0, (unsigned char *)BUFFER_OFFSET(0), pbo);
+ input->set_pixel_data(1, (unsigned char *)BUFFER_OFFSET(width * height), pbo);
+ input->set_pixel_data(2, (unsigned char *)BUFFER_OFFSET(width * height * 2), pbo);
+ tester.get_chain()->add_input(input);
+
+ tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_sRGB);
+
+ // Y'CbCr isn't 100% accurate (the input values are rounded),
+ // so we need some leeway.
+ expect_equal(expected_data, out_data, 4 * width, height, 0.025, 0.002);
+
+ glDeleteBuffers(1, &pbo);
+}
+
+TEST(YCbCrInputTest, CombinedCbAndCr) {
+ const int width = 1;
+ const int height = 5;
+
+ // Pure-color test inputs, calculated with the formulas in Rec. 601
+ // section 2.5.4.
+ unsigned char y[width * height] = {
+ 16, 235, 81, 145, 41,
+ };
+ unsigned char cb_cr[width * height * 2] = {
+ 128, 128,
+ 128, 128,
+ 90, 240,
+ 54, 34,
+ 240, 110,
+ };
+ float expected_data[4 * width * height] = {
+ 0.0, 0.0, 0.0, 1.0,
+ 1.0, 1.0, 1.0, 1.0,
+ 1.0, 0.0, 0.0, 1.0,
+ 0.0, 1.0, 0.0, 1.0,
+ 0.0, 0.0, 1.0, 1.0,
+ };
+ float out_data[4 * width * height];
+
+ EffectChainTester tester(NULL, width, height);
+
+ ImageFormat format;
+ format.color_space = COLORSPACE_sRGB;
+ format.gamma_curve = GAMMA_sRGB;
+
+ YCbCrFormat ycbcr_format;
+ ycbcr_format.luma_coefficients = YCBCR_REC_601;
+ ycbcr_format.full_range = false;
+ ycbcr_format.num_levels = 256;
+ ycbcr_format.chroma_subsampling_x = 1;
+ ycbcr_format.chroma_subsampling_y = 1;
+ ycbcr_format.cb_x_position = 0.5f;
+ ycbcr_format.cb_y_position = 0.5f;
+ ycbcr_format.cr_x_position = 0.5f;
+ ycbcr_format.cr_y_position = 0.5f;
+
+ YCbCrInput *input = new YCbCrInput(format, ycbcr_format, width, height, YCBCR_INPUT_SPLIT_Y_AND_CBCR);
+ input->set_pixel_data(0, y);
+ input->set_pixel_data(1, cb_cr);
+ tester.get_chain()->add_input(input);
+
+ tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_sRGB);
+
+ // Y'CbCr isn't 100% accurate (the input values are rounded),
+ // so we need some leeway.
+ expect_equal(expected_data, out_data, 4 * width, height, 0.025, 0.002);
+}
+
+TEST(YCbCrInputTest, ExternalTexture) {
+ const int width = 1;
+ const int height = 5;
+
+ // Pure-color test inputs, calculated with the formulas in Rec. 601
+ // section 2.5.4.
+ unsigned char y[width * height] = {
+ 16, 235, 81, 145, 41,
+ };
+ unsigned char cb[width * height] = {
+ 128, 128, 90, 54, 240,
+ };
+ unsigned char cr[width * height] = {
+ 128, 128, 240, 34, 110,
+ };
+ float expected_data[4 * width * height] = {
+ 0.0, 0.0, 0.0, 1.0,
+ 1.0, 1.0, 1.0, 1.0,
+ 1.0, 0.0, 0.0, 1.0,
+ 0.0, 1.0, 0.0, 1.0,
+ 0.0, 0.0, 1.0, 1.0,
+ };
+ float out_data[4 * width * height];
+
+ EffectChainTester tester(NULL, width, height);
+
+ ImageFormat format;
+ format.color_space = COLORSPACE_sRGB;
+ format.gamma_curve = GAMMA_sRGB;
+
+ YCbCrFormat ycbcr_format;
+ ycbcr_format.luma_coefficients = YCBCR_REC_601;
+ ycbcr_format.full_range = false;
+ ycbcr_format.num_levels = 256;
+ ycbcr_format.chroma_subsampling_x = 1;
+ ycbcr_format.chroma_subsampling_y = 1;
+ ycbcr_format.cb_x_position = 0.5f;
+ ycbcr_format.cb_y_position = 0.5f;
+ ycbcr_format.cr_x_position = 0.5f;
+ ycbcr_format.cr_y_position = 0.5f;
+
+ // Make a texture for the Cb data; keep the others as regular uploads.
+ ResourcePool pool;
+ GLuint cb_tex = pool.create_2d_texture(GL_R8, width, height);
+ check_error();
+ glBindTexture(GL_TEXTURE_2D, cb_tex);
+ check_error();
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ check_error();
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+ check_error();
+ glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, GL_RED, GL_UNSIGNED_BYTE, cb);
+ check_error();
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+ check_error();
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+ check_error();
+
+ YCbCrInput *input = new YCbCrInput(format, ycbcr_format, width, height);
+ input->set_pixel_data(0, y);
+ input->set_texture_num(1, cb_tex);
+ input->set_pixel_data(2, cr);
+ tester.get_chain()->add_input(input);
+
+ tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_sRGB);
+
+ pool.release_2d_texture(cb_tex);
+
+ // Y'CbCr isn't 100% accurate (the input values are rounded),
+ // so we need some leeway.
+ expect_equal(expected_data, out_data, 4 * width, height, 0.025, 0.002);
+}
+
+TEST(YCbCrTest, WikipediaRec601ForwardMatrix) {
+ YCbCrFormat ycbcr_format;
+ ycbcr_format.luma_coefficients = YCBCR_REC_601;
+ ycbcr_format.full_range = false;
+ ycbcr_format.num_levels = 256;
+
+ float offset[3];
+ Eigen::Matrix3d ycbcr_to_rgb;
+ compute_ycbcr_matrix(ycbcr_format, offset, &ycbcr_to_rgb);
+
+ Eigen::Matrix3d rgb_to_ycbcr = ycbcr_to_rgb.inverse() * 255.0;
+
+ // Values from https://en.wikipedia.org/wiki/YCbCr#ITU-R_BT.601_conversion.
+ EXPECT_NEAR( 65.481, rgb_to_ycbcr(0,0), 1e-3);
+ EXPECT_NEAR( 128.553, rgb_to_ycbcr(0,1), 1e-3);
+ EXPECT_NEAR( 24.966, rgb_to_ycbcr(0,2), 1e-3);
+
+ EXPECT_NEAR( -37.797, rgb_to_ycbcr(1,0), 1e-3);
+ EXPECT_NEAR( -74.203, rgb_to_ycbcr(1,1), 1e-3);
+ EXPECT_NEAR( 112.000, rgb_to_ycbcr(1,2), 1e-3);
+
+ EXPECT_NEAR( 112.000, rgb_to_ycbcr(2,0), 1e-3);
+ EXPECT_NEAR( -93.786, rgb_to_ycbcr(2,1), 1e-3);
+ EXPECT_NEAR( -18.214, rgb_to_ycbcr(2,2), 1e-3);
+
+ EXPECT_NEAR( 16.0, offset[0] * 255.0, 1e-3);
+ EXPECT_NEAR(128.0, offset[1] * 255.0, 1e-3);
+ EXPECT_NEAR(128.0, offset[2] * 255.0, 1e-3);
+}
+
+TEST(YCbCrTest, WikipediaJPEGMatrices) {
+ YCbCrFormat ycbcr_format;
+ ycbcr_format.luma_coefficients = YCBCR_REC_601;
+ ycbcr_format.full_range = true;
+ ycbcr_format.num_levels = 256;
+
+ float offset[3];
+ Eigen::Matrix3d ycbcr_to_rgb;
+ compute_ycbcr_matrix(ycbcr_format, offset, &ycbcr_to_rgb);
+
+ // Values from https://en.wikipedia.org/wiki/YCbCr#JPEG_conversion.
+ EXPECT_NEAR( 1.00000, ycbcr_to_rgb(0,0), 1e-5);
+ EXPECT_NEAR( 0.00000, ycbcr_to_rgb(0,1), 1e-5);
+ EXPECT_NEAR( 1.40200, ycbcr_to_rgb(0,2), 1e-5);
+
+ EXPECT_NEAR( 1.00000, ycbcr_to_rgb(1,0), 1e-5);
+ EXPECT_NEAR(-0.34414, ycbcr_to_rgb(1,1), 1e-5);
+ EXPECT_NEAR(-0.71414, ycbcr_to_rgb(1,2), 1e-5);
+
+ EXPECT_NEAR( 1.00000, ycbcr_to_rgb(2,0), 1e-5);
+ EXPECT_NEAR( 1.77200, ycbcr_to_rgb(2,1), 1e-5);
+ EXPECT_NEAR( 0.00000, ycbcr_to_rgb(2,2), 1e-5);
+
+ Eigen::Matrix3d rgb_to_ycbcr = ycbcr_to_rgb.inverse();
+
+ // Same.
+ EXPECT_NEAR( 0.299000, rgb_to_ycbcr(0,0), 1e-6);
+ EXPECT_NEAR( 0.587000, rgb_to_ycbcr(0,1), 1e-6);
+ EXPECT_NEAR( 0.114000, rgb_to_ycbcr(0,2), 1e-6);
+
+ EXPECT_NEAR(-0.168736, rgb_to_ycbcr(1,0), 1e-6);
+ EXPECT_NEAR(-0.331264, rgb_to_ycbcr(1,1), 1e-6);
+ EXPECT_NEAR( 0.500000, rgb_to_ycbcr(1,2), 1e-6);
+
+ EXPECT_NEAR( 0.500000, rgb_to_ycbcr(2,0), 1e-6);
+ EXPECT_NEAR(-0.418688, rgb_to_ycbcr(2,1), 1e-6);
+ EXPECT_NEAR(-0.081312, rgb_to_ycbcr(2,2), 1e-6);
+
+ EXPECT_NEAR( 0.0, offset[0] * 255.0, 1e-3);
+ EXPECT_NEAR(128.0, offset[1] * 255.0, 1e-3);
+ EXPECT_NEAR(128.0, offset[2] * 255.0, 1e-3);
+}
+
+} // namespace movit
projects / movit / blobdiff