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Fixing flaw in gamma transform.

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This commit is contained in:
Emil Martinec
2012-03-31 09:22:14 -05:00
parent bec0a30ef1
commit 982f95f747
3 changed files with 36 additions and 3 deletions
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35
rtengine/FTblockDN.cc
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@@ -112,7 +112,7 @@ namespace rtengine {
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
// gamma transform for input data
float gam = dnparams.gamma;
float gamthresh = 0.03;
float gamthresh = 0.001;
float gamslope = exp(log((double)gamthresh)/gam)/gamthresh;
LUTf gamcurve(65536,0);
@@ -769,6 +769,9 @@ namespace rtengine {
//simple wavelet shrinkage
const float eps = 0.01f;
float * sfave = new float[W_L*H_L];
float * sfavea = new float[W_L*H_L];
float * sfaveb = new float[W_L*H_L];
int max;
printf("\n level=%d \n",level);
@@ -797,14 +800,37 @@ namespace rtengine {
float mag_a = SQR(WavCoeffs_a[dir][coeffloc_ab])+eps;
float mag_b = SQR(WavCoeffs_b[dir][coeffloc_ab])+eps;
sfavea[coeffloc_ab] = (1-exp(-(mag_a/mad_a)-(mag_L/(9*madL))));
sfaveb[coeffloc_ab] = (1-exp(-(mag_b/mad_b)-(mag_L/(9*madL))));
// 'firm' threshold of chroma coefficients
WavCoeffs_a[dir][coeffloc_ab] *= SQR(1-exp(-(mag_a/mad_a)-(mag_L/(9*madL))));//(coeff_a>2*thresh_a ? 1 : (coeff_a<thresh_a ? 0 : (coeff_a/thresh_a - 1)));
WavCoeffs_b[dir][coeffloc_ab] *= SQR(1-exp(-(mag_b/mad_b)-(mag_L/(9*madL))));//(coeff_b>2*thresh_b ? 1 : (coeff_b<thresh_b ? 0 : (coeff_b/thresh_b - 1)));
//WavCoeffs_a[dir][coeffloc_ab] *= (1-exp(-(mag_a/mad_a)-(mag_L/(9*madL))));//(coeff_a>2*thresh_a ? 1 : (coeff_a<thresh_a ? 0 : (coeff_a/thresh_a - 1)));
//WavCoeffs_b[dir][coeffloc_ab] *= (1-exp(-(mag_b/mad_b)-(mag_L/(9*madL))));//(coeff_b>2*thresh_b ? 1 : (coeff_b<thresh_b ? 0 : (coeff_b/thresh_b - 1)));
}
}//now chrominance coefficients are denoised
boxblur(sfavea, sfavea, level+2, level+2, W_ab, H_ab);//increase smoothness by locally averaging shrinkage
boxblur(sfaveb, sfaveb, level+2, level+2, W_ab, H_ab);//increase smoothness by locally averaging shrinkage
for (int i=0; i<H_ab; i++)
for (int j=0; j<W_ab; j++) {
int coeffloc_ab = i*W_ab+j;
int coeffloc_L = ((i*skip_L)/skip_ab)*W_L + ((j*skip_L)/skip_ab);
float mag_L = SQR(WavCoeffs_L[dir][coeffloc_L ])+eps;
float mag_a = SQR(WavCoeffs_a[dir][coeffloc_ab])+eps;
float mag_b = SQR(WavCoeffs_b[dir][coeffloc_ab])+eps;
float sfa = (1-exp(-(mag_a/mad_a)-(mag_L/(9*madL))));
float sfb = (1-exp(-(mag_b/mad_b)-(mag_L/(9*madL))));
//use smoothed shrinkage unless local shrinkage is much less
WavCoeffs_a[dir][coeffloc_ab] *= (SQR(sfavea[coeffloc_ab])+SQR(sfa))/(sfavea[coeffloc_ab]+sfa+eps);
WavCoeffs_b[dir][coeffloc_ab] *= (SQR(sfaveb[coeffloc_ab])+SQR(sfb))/(sfaveb[coeffloc_ab]+sfb+eps);
}//now chrominance coefficients are denoised
}
if (noisevar_L>0.01) {
@@ -834,6 +860,9 @@ namespace rtengine {
}
delete[] sfave;
delete[] sfavea;
delete[] sfaveb;
}

2
rtengine/dcrop.cc
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@@ -102,6 +102,8 @@ void Crop::update (int todo) {
PreviewProps pp (trafx, trafy, trafw*skip, trafh*skip, skip);
parent->imgsrc->getImage (parent->currWB, tr, origCrop, pp, params.hlrecovery, params.icm, params.raw );
//parent->imgsrc->convertColorSpace(origCrop, params.icm);
if (todo & M_LINDENOISE) {
if (skip==1 && params.dirpyrDenoise.enabled) {
parent->ipf.RGB_denoise(origCrop, origCrop, /*Roffset,*/ params.dirpyrDenoise, params.defringe);

2
rtengine/improccoordinator.cc
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@@ -202,6 +202,8 @@ void ImProcCoordinator::updatePreviewImage (int todo, Crop* cropCall) {
setScale (scale);
imgsrc->getImage (currWB, tr, orig_prev, pp, params.hlrecovery, params.icm, params.raw);
//imgsrc->convertColorSpace(orig_prev, params.icm);
if (todo & M_LINDENOISE) {
//printf("denoising!\n");
if (scale==1 && params.dirpyrDenoise.enabled) {