ref: efad6feb9a6cce66f849adcdc631becb31376b94
dir: /test/add_noise_test.cc/
/*
* Copyright (c) 2016 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <math.h>
#include "test/clear_system_state.h"
#include "test/register_state_check.h"
#include "third_party/googletest/src/include/gtest/gtest.h"
#include "./vpx_dsp_rtcd.h"
#include "vpx/vpx_integer.h"
#include "vpx_mem/vpx_mem.h"
namespace {
// TODO(jimbankoski): make width and height integers not unsigned.
typedef void (*AddNoiseFunc)(unsigned char *start, char *noise,
char blackclamp[16], char whiteclamp[16],
char bothclamp[16], unsigned int width,
unsigned int height, int pitch);
class AddNoiseTest
: public ::testing::TestWithParam<AddNoiseFunc> {
public:
virtual void TearDown() {
libvpx_test::ClearSystemState();
}
virtual ~AddNoiseTest() {}
};
double stddev6(char a, char b, char c, char d, char e, char f) {
const double n = (a + b + c + d + e + f) / 6.0;
const double v = ((a - n) * (a - n) + (b - n) * (b - n) + (c - n) * (c - n) +
(d - n) * (d - n) + (e - n) * (e - n) + (f - n) * (f - n)) /
6.0;
return sqrt(v);
}
// TODO(jimbankoski): The following 2 functions are duplicated in each codec.
// For now the vp9 one has been copied into the test as is. We should normalize
// these in vpx_dsp and not have 3 copies of these unless there is different
// noise we add for each codec.
double gaussian(double sigma, double mu, double x) {
return 1 / (sigma * sqrt(2.0 * 3.14159265)) *
(exp(-(x - mu) * (x - mu) / (2 * sigma * sigma)));
}
int setup_noise(int size_noise, char *noise) {
char char_dist[300];
const int ai = 4;
const int qi = 24;
const double sigma = ai + .5 + .6 * (63 - qi) / 63.0;
/* set up a lookup table of 256 entries that matches
* a gaussian distribution with sigma determined by q.
*/
int next = 0;
for (int i = -32; i < 32; i++) {
int a_i = (int) (0.5 + 256 * gaussian(sigma, 0, i));
if (a_i) {
for (int j = 0; j < a_i; j++) {
char_dist[next + j] = (char)(i);
}
next = next + a_i;
}
}
for (; next < 256; next++)
char_dist[next] = 0;
for (int i = 0; i < size_noise; i++) {
noise[i] = char_dist[rand() & 0xff]; // NOLINT
}
// Returns the most negative value in distribution.
return char_dist[0];
}
TEST_P(AddNoiseTest, CheckNoiseAdded) {
DECLARE_ALIGNED(16, char, blackclamp[16]);
DECLARE_ALIGNED(16, char, whiteclamp[16]);
DECLARE_ALIGNED(16, char, bothclamp[16]);
const int width = 64;
const int height = 64;
const int image_size = width * height;
char noise[3072];
const int clamp = setup_noise(3072, noise);
for (int i = 0; i < 16; i++) {
blackclamp[i] = -clamp;
whiteclamp[i] = -clamp;
bothclamp[i] = -2 * clamp;
}
uint8_t *const s = reinterpret_cast<uint8_t *>(vpx_calloc(image_size, 1));
memset(s, 99, image_size);
ASM_REGISTER_STATE_CHECK(GetParam()(s, noise, blackclamp, whiteclamp,
bothclamp, width, height, width));
// Check to make sure we don't end up having either the same or no added
// noise either vertically or horizontally.
for (int i = 0; i < image_size - 6 * width - 6; ++i) {
const double hd = stddev6(s[i] - 99, s[i + 1] - 99, s[i + 2] - 99,
s[i + 3] - 99, s[i + 4] - 99, s[i + 5] - 99);
const double vd = stddev6(s[i] - 99, s[i + width] - 99,
s[i + 2 * width] - 99, s[i + 3 * width] - 99,
s[i + 4 * width] - 99, s[i + 5 * width] - 99);
EXPECT_NE(hd, 0);
EXPECT_NE(vd, 0);
}
// Initialize pixels in the image to 255 and check for roll over.
memset(s, 255, image_size);
ASM_REGISTER_STATE_CHECK(GetParam()(s, noise, blackclamp, whiteclamp,
bothclamp, width, height, width));
// Check to make sure don't roll over.
for (int i = 0; i < image_size; ++i) {
EXPECT_GT((int)s[i], 10) << "i = " << i;
}
// Initialize pixels in the image to 0 and check for roll under.
memset(s, 0, image_size);
ASM_REGISTER_STATE_CHECK(GetParam()(s, noise, blackclamp, whiteclamp,
bothclamp, width, height, width));
// Check to make sure don't roll under.
for (int i = 0; i < image_size; ++i) {
EXPECT_LT((int)s[i], 245) << "i = " << i;
}
vpx_free(s);
}
TEST_P(AddNoiseTest, CheckCvsAssembly) {
DECLARE_ALIGNED(16, char, blackclamp[16]);
DECLARE_ALIGNED(16, char, whiteclamp[16]);
DECLARE_ALIGNED(16, char, bothclamp[16]);
const int width = 64;
const int height = 64;
const int image_size = width * height;
char noise[3072];
const int clamp = setup_noise(3072, noise);
for (int i = 0; i < 16; i++) {
blackclamp[i] = -clamp;
whiteclamp[i] = -clamp;
bothclamp[i] = -2 * clamp;
}
uint8_t *const s = reinterpret_cast<uint8_t *>(vpx_calloc(image_size, 1));
uint8_t *const d = reinterpret_cast<uint8_t *>(vpx_calloc(image_size, 1));
memset(s, 99, image_size);
memset(d, 99, image_size);
srand(0);
ASM_REGISTER_STATE_CHECK(GetParam()(s, noise, blackclamp, whiteclamp,
bothclamp, width, height, width));
srand(0);
ASM_REGISTER_STATE_CHECK(vpx_plane_add_noise_c(d, noise, blackclamp,
whiteclamp, bothclamp,
width, height, width));
for (int i = 0; i < image_size; ++i) {
EXPECT_EQ((int)s[i], (int)d[i]) << "i = " << i;
}
vpx_free(d);
vpx_free(s);
}
INSTANTIATE_TEST_CASE_P(C, AddNoiseTest,
::testing::Values(vpx_plane_add_noise_c));
#if HAVE_SSE2
INSTANTIATE_TEST_CASE_P(SSE2, AddNoiseTest,
::testing::Values(vpx_plane_add_noise_sse2));
#endif
#if HAVE_MSA
INSTANTIATE_TEST_CASE_P(MSA, AddNoiseTest,
::testing::Values(vpx_plane_add_noise_msa));
#endif
} // namespace