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Merge pull request #5064 from Beep6581/contrast_threshold_calculation_improvement

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Improve calculation of dual demosaic contrast threshold
This commit is contained in:
Ingo Weyrich
2018-12-05 17:35:54 +01:00
committed by GitHub
parent feb718adb5 1b0baf78ff
commit 0048f29aab
1 changed files with 23 additions and 19 deletions
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42
rtengine/rt_algo.cc
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@@ -22,8 +22,6 @@
#include <cmath>
#include <cstdint>
#include <vector>
#include <iostream>
#include <vector>
#ifdef _OPENMP
#include <omp.h>
#endif
@@ -203,19 +201,21 @@ void buildBlendMask(float** luminance, float **blend, int W, int H, float &contr
}
}
} else {
constexpr float scale = 0.0625f / 327.68f;
if (autoContrast) {
for (int pass = 0; pass < 2; ++pass) {
const int tilesize = 80 / (pass + 1);
const int numTilesW = W / tilesize;
const int numTilesH = H / tilesize;
std::vector<std::vector<std::pair<float, float>>> variances(numTilesH, std::vector<std::pair<float, float>>(numTilesW));
const int skip = pass == 0 ? tilesize : tilesize / 4;
const int numTilesW = W / skip - 3 * pass;
const int numTilesH = H / skip - 3 * pass;
std::vector<std::vector<float>> variances(numTilesH, std::vector<float>(numTilesW));
#pragma omp parallel for
#ifdef _OPENMP
#pragma omp parallel for schedule(dynamic)
#endif
for (int i = 0; i < numTilesH; ++i) {
int tileY = i * tilesize;
const int tileY = i * skip;
for (int j = 0; j < numTilesW; ++j) {
int tileX = j * tilesize;
const int tileX = j * skip;
#ifdef __SSE2__
vfloat avgv = ZEROV;
for (int y = tileY; y < tileY + tilesize; ++y) {
@@ -225,7 +225,7 @@ void buildBlendMask(float** luminance, float **blend, int W, int H, float &contr
}
float avg = vhadd(avgv);
#else
float avg = 0.;
float avg = 0.f;
for (int y = tileY; y < tileY + tilesize; ++y) {
for (int x = tileX; x < tileX + tilesize; ++x) {
avg += luminance[y][x];
@@ -233,6 +233,11 @@ void buildBlendMask(float** luminance, float **blend, int W, int H, float &contr
}
#endif
avg /= SQR(tilesize);
if (avg < 2000.f || avg > 20000.f) {
// too dark or too bright => skip the tile
variances[i][j] = RT_INFINITY_F;
continue;
}
#ifdef __SSE2__
vfloat varv = ZEROV;
avgv = F2V(avg);
@@ -243,16 +248,15 @@ void buildBlendMask(float** luminance, float **blend, int W, int H, float &contr
}
float var = vhadd(varv);
#else
float var = 0.0;
float var = 0.f;
for (int y = tileY; y < tileY + tilesize; ++y) {
for (int x = tileX; x < tileX + tilesize; ++x) {
var += SQR(luminance[y][x] - avg);
}
}
#endif
#endif
var /= (SQR(tilesize) * avg);
variances[i][j].first = var;
variances[i][j].second = avg;
variances[i][j] = var;
}
}
@@ -260,18 +264,17 @@ void buildBlendMask(float** luminance, float **blend, int W, int H, float &contr
int minI = 0, minJ = 0;
for (int i = 0; i < numTilesH; ++i) {
for (int j = 0; j < numTilesW; ++j) {
if (variances[i][j].first < minvar && variances[i][j].second > 2000.f && variances[i][j].second < 20000.f) {
minvar = variances[i][j].first;
if (variances[i][j] < minvar) {
minvar = variances[i][j];
minI = i;
minJ = j;
}
}
}
const int minY = tilesize * minI;
const int minX = tilesize * minJ;
const int minY = skip * minI;
const int minX = skip * minJ;
// std::cout << pass << ": minvar : " << minvar << std::endl;
if (minvar <= 1.f || pass == 1) {
// a variance <= 1 means we already found a flat region and can skip second pass
// in second pass we allow a variance of 2
@@ -295,6 +298,7 @@ void buildBlendMask(float** luminance, float **blend, int W, int H, float &contr
}
}
} else {
constexpr float scale = 0.0625f / 327.68f;
#ifdef _OPENMP
#pragma omp parallel
#endif