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guided filter: further small reduction of peak memory usage

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This commit is contained in:
heckflosse 2019-02-14 15:30:05 +01:00
parent 43a80b0341
commit 9e1fcb31ef
1 changed files with 19 additions and 14 deletions
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33
rtengine/guidedfilter.cc
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@ -32,7 +32,8 @@
#include "boxblur.h"
#include "rescale.h"
#include "imagefloat.h"
#define BENCHMARK
#include "StopWatch.h"
namespace rtengine {
#if 0
@ -78,6 +79,7 @@ int calculate_subsampling(int w, int h, int r)
void guidedFilter(const array2D<float> &guide, const array2D<float> &src, array2D<float> &dst, int r, float epsilon, bool multithread, int subsampling)
{
BENCHFUN
const int W = src.width();
const int H = src.height();
@ -135,16 +137,6 @@ void guidedFilter(const array2D<float> &guide, const array2D<float> &src, array2
const array2D<float> &p = src;
array2D<float> &q = dst;
AlignedBuffer<float> blur_buf(I.width() * I.height());
const auto f_mean =
[&](array2D<float> &d, array2D<float> &s, int rad) -> void
{
rad = LIM(rad, 0, (min(s.width(), s.height()) - 1) / 2 - 1);
float **src = s;
float **dst = d;
boxblur<float, float>(src, dst, blur_buf.data, rad, rad, s.width(), s.height());
};
const auto f_subsample =
[=](array2D<float> &d, const array2D<float> &s) -> void
{
@ -153,8 +145,18 @@ void guidedFilter(const array2D<float> &guide, const array2D<float> &src, array2
const auto f_upsample = f_subsample;
const int w = W / subsampling;
const int h = H / subsampling;
const size_t w = W / subsampling;
const size_t h = H / subsampling;
AlignedBuffer<float> blur_buf(w * h);
const auto f_mean =
[&](array2D<float> &d, array2D<float> &s, int rad) -> void
{
rad = LIM(rad, 0, (min(s.width(), s.height()) - 1) / 2 - 1);
float **src = s;
float **dst = d;
boxblur<float, float>(src, dst, blur_buf.data, rad, rad, s.width(), s.height());
};
array2D<float> I1(w, h);
array2D<float> p1(w, h);
@ -203,6 +205,9 @@ void guidedFilter(const array2D<float> &guide, const array2D<float> &src, array2
apply(SUBMUL, b, a, meanI, meanp);
DEBUG_DUMP(b);
meanI.free(); // frees w * h * 4 byte
meanp.free(); // frees w * h * 4 byte
array2D<float> &meana = a;
f_mean(meana, a, r1);
DEBUG_DUMP(meana);
@ -211,7 +216,7 @@ void guidedFilter(const array2D<float> &guide, const array2D<float> &src, array2
f_mean(meanb, b, r1);
DEBUG_DUMP(meanb);
blur_buf.resize(0); // frees W * H * 4 byte
blur_buf.resize(0); // frees w * h * 4 byte
array2D<float> meanA(W, H);
f_upsample(meanA, meana);