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dehaze: do not consider out-of-gamut pixels when estimating the ambient light

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This commit is contained in:
Alberto Griggio
2018-10-17 15:38:35 +02:00
parent 4d0ddd56e5
commit 59339644de
1 changed files with 14 additions and 7 deletions
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21
rtengine/ipdehaze.cc
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@@ -58,8 +58,7 @@ namespace {
#endif
int get_dark_channel(const array2D<float> &R, const array2D<float> &G, const array2D<float> &B, array2D<float> &dst,
int patchsize, float *ambient, bool multithread)
int get_dark_channel(const array2D<float> &R, const array2D<float> &G, const array2D<float> &B, array2D<float> &dst, int patchsize, float *ambient, bool clip, bool multithread)
{
const int W = R.width();
const int H = R.height();
@@ -89,7 +88,9 @@ int get_dark_channel(const array2D<float> &R, const array2D<float> &G, const arr
}
val = min(val, yval);
}
val = LIM01(val);
if (clip) {
val = LIM01(val);
}
for (int yy = y; yy < pH; ++yy) {
std::fill(dst[yy]+x, dst[yy]+pW, val);
}
@@ -120,7 +121,9 @@ float estimate_ambient_light(const array2D<float> &R, const array2D<float> &G, c
std::priority_queue<float> p;
for (int y = 0; y < H; y += patchsize) {
for (int x = 0; x < W; x += patchsize) {
p.push(dark[y][x]);
if (!OOG(dark[y][x], 1.f)) {
p.push(dark[y][x]);
}
}
}
darklim = get_percentile(p, 0.95);
@@ -131,7 +134,7 @@ float estimate_ambient_light(const array2D<float> &R, const array2D<float> &G, c
for (int y = 0; y < H; y += patchsize) {
for (int x = 0; x < W; x += patchsize) {
if (dark[y][x] >= darklim) {
if (dark[y][x] >= darklim && !OOG(dark[y][x], 1.f)) {
patches.push_back(std::make_pair(x, y));
}
}
@@ -245,7 +248,7 @@ void ImProcFunctions::dehaze(Imagefloat *img)
extract_channels(img, R, G, B, patchsize, 1e-1, multiThread);
patchsize = max(max(W, H) / 600, 2);
npatches = get_dark_channel(R, G, B, dark, patchsize, nullptr, multiThread);
npatches = get_dark_channel(R, G, B, dark, patchsize, nullptr, false, multiThread);
DEBUG_DUMP(dark);
max_t = estimate_ambient_light(R, G, B, dark, patchsize, npatches, ambient);
@@ -256,7 +259,7 @@ void ImProcFunctions::dehaze(Imagefloat *img)
<< std::endl;
}
get_dark_channel(R, G, B, dark, patchsize, ambient, multiThread);
get_dark_channel(R, G, B, dark, patchsize, ambient, true, multiThread);
}
if (min(ambient[0], ambient[1], ambient[2]) < 0.01f) {
@@ -289,6 +292,10 @@ void ImProcFunctions::dehaze(Imagefloat *img)
DEBUG_DUMP(t);
if (options.rtSettings.verbose) {
std::cout << "dehaze: max distance is " << max_t << std::endl;
}
float depth = -float(params->dehaze.depth) / 100.f;
const float t0 = max(1e-3f, std::exp(depth * max_t));
const float teps = 1e-3f;