142 lines
4.4 KiB
C++
142 lines
4.4 KiB
C++
/*
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* This file is part of RawTherapee.
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*
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* RawTherapee is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* RawTherapee is distributed in the hope that it will be useful,
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* but widthITheightOUT ANY widthARRANTY; without even the implied warranty of
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* MERCheightANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with RawTherapee. If not, see <http://www.gnu.org/licenses/>.
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*
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* 2010 Emil Martinec <ejmartin@uchicago.edu>
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*
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*/
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#include <cstddef>
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#include "rt_math.h"
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#include "rt_math.h"
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#include "labimage.h"
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#include "improcfun.h"
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using namespace std;
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namespace rtengine {
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void ImProcFunctions::impulse_nr (LabImage* lab, double thresh) {
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// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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// impulse noise removal
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// local variables
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int width = lab->W;
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int height = lab->H;
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float hpfabs, hfnbrave;
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// buffer for the lowpass image
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float ** lpf = new float *[height];
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// buffer for the highpass image
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float ** impish = new float *[height];
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for (int i=0; i<height; i++) {
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lpf[i] = new float [width];
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//memset (lpf[i], 0, width*sizeof(float));
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impish[i] = new float [width];
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//memset (impish[i], 0, width*sizeof(unsigned short));
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}
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//The cleaning algorithm starts here
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//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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// modified bilateral filter for lowpass image, omitting input pixel; or Gaussian blur
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static float eps = 1.0;
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float wtdsum[3], dirwt, norm;
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int i1, j1;
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//rangeblur<unsigned short, unsigned int> (lab->L, lpf, impish /*used as buffer here*/, width, height, thresh, false);
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#ifdef _OPENMP
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#pragma omp parallel
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#endif
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{
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AlignedBufferMP<double> buffer(max(width,height));
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gaussHorizontal<float> (lab->L, lpf, buffer, width, height, max(2.0,thresh-1.0));
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gaussVertical<float> (lpf, lpf, buffer, width, height, max(2.0,thresh-1.0));
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}
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//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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float impthr = max(1.0,5.5-thresh);
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float impthrDiv24 = impthr / 24.0f; //Issue 1671: moved the Division outside the loop, impthr can be optimized out too, but I let in the code at the moment
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#ifdef _OPENMP
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#pragma omp parallel for private(hpfabs, hfnbrave,i1,j1)
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#endif
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for (int i=0; i < height; i++)
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for (int j=0; j < width; j++) {
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hpfabs = fabs(lab->L[i][j]-lpf[i][j]);
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//block average of high pass data
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for (i1=max(0,i-2), hfnbrave=0; i1<=min(i+2,height-1); i1++ )
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for (j1=max(0,j-2); j1<=min(j+2,width-1); j1++ ) {
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hfnbrave += fabs(lab->L[i1][j1]-lpf[i1][j1]);
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}
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impish[i][j] = (hpfabs>((hfnbrave-hpfabs)*impthrDiv24));
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}//now impulsive values have been identified
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// Issue 1671:
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// often, noise isn't evenly distributed, e.g. only a few noisy pixels in the bright sky, but many in the dark foreground,
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// so it's better to schedule dynamic and let every thread only process 16 rows, to avoid running big threads out of work
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// Measured it and in fact gives better performance than without schedule(dynamic,16). Of course, there could be a better
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// choice for the chunk_size than 16
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// race conditions are avoided by the array impish
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#ifdef _OPENMP
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#pragma omp parallel for private(wtdsum,norm,dirwt,i1,j1) schedule(dynamic,16)
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#endif
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for (int i=0; i < height; i++)
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for (int j=0; j < width; j++) {
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if (!impish[i][j]) continue;
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norm=0.0;
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wtdsum[0]=wtdsum[1]=wtdsum[2]=0.0;
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for (i1=max(0,i-2), hfnbrave=0; i1<=min(i+2,height-1); i1++ )
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for (j1=max(0,j-2); j1<=min(j+2,width-1); j1++ ) {
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if (i1==i && j1==j) continue;
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if (impish[i1][j1]) continue;
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dirwt = 1/(SQR(lab->L[i1][j1]-lab->L[i][j])+eps);//use more sophisticated rangefn???
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wtdsum[0] += dirwt*lab->L[i1][j1];
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wtdsum[1] += dirwt*lab->a[i1][j1];
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wtdsum[2] += dirwt*lab->b[i1][j1];
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norm += dirwt;
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}
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//wtdsum /= norm;
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if (norm) {
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lab->L[i][j]=wtdsum[0]/norm;//low pass filter
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lab->a[i][j]=wtdsum[1]/norm;//low pass filter
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lab->b[i][j]=wtdsum[2]/norm;//low pass filter
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}
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}//now impulsive values have been corrected
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for (int i=0; i<height; i++) {
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delete [] lpf[i];
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delete [] impish[i];
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}
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delete [] lpf;
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delete [] impish;
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}
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}
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