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/*-----------------------------------------------------------------------------------------
 * Copyright (C) 2013  For the list of authors, see file AUTHORS.
 *
 * This file is part of DENISE.
 * 
 * DENISE is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 2.0 of the License only.
 * 
 * DENISE is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with DENISE. See file COPYING and/or <http://www.gnu.org/licenses/gpl-2.0.html>.
-----------------------------------------------------------------------------------------*/

/*
 * Smoothing gradient / model with a median filter
 * M. Schaefer - May 2011
 * Update - August 2013
 */

#include "fd.h"

void smooth(float ** mat, int sws, int filter, float Vs_avg, float FC)
{

	/* extern variables */

        extern float DH, A;
	extern int FREE_SURF, NX, NY, NXG, NYG;
	extern int NPROCX, NPROCY, MYID, POS[3];
	extern char JACOBIAN[STRING_SIZE], INV_MODELFILE[STRING_SIZE];
	extern FILE *FP;
	extern int FILT_SIZE_GRAD, FILT_SIZE, MODEL_FILTER, GRAD_FILTER, TIME_FILT,GRAD_FILT_WAVELENGTH;
	
	/* local variables */
	int i, j, ii, jj;
	int i1, j1, filtsize, hfs;

	float **model_tmp, **model_med, **filterpart, grad, normgauss, smooth_meter;
	
	char jac_tmp[STRING_SIZE];
	
	FILE *model;
	
	char modfile[STRING_SIZE];
	
	
	if(MYID==0){
			switch (filter){
		      	case 1:
				if((GRAD_FILT_WAVELENGTH==1)&&(TIME_FILT==1)){
					printf("\n -------------------------------------------------------------------------- \n");
					printf("\n Calculating a wavelength dependent filter size for smoothing the gradient: \n");
					FILT_SIZE_GRAD = (int)(Vs_avg/FC*A/DH);
					printf("\n FILT_SIZE_GRAD = Vs_avg = %4.2f m/s / FC = %4.2f Hz * weighting factor A = %4.2f / grid spacing DH = %4.2f m  \n",Vs_avg,FC,A,DH);
					printf("\n New FILT_SIZE_GRAD = %d (grid points) is used (-> %4.2f m).                \n",FILT_SIZE_GRAD,FILT_SIZE_GRAD*DH);
					}
				if (FILT_SIZE_GRAD==0)	return;
		      		if (!(FILT_SIZE_GRAD % 2)) {
		      		if (FILT_SIZE_GRAD > 0)	FILT_SIZE_GRAD += 1;
		      		else			FILT_SIZE_GRAD -= 1;
		      		}
	  			hfs = abs(FILT_SIZE_GRAD)/2;
				printf("\n ----------------------------------------------------------------\n");
				printf("\n Filter size is %d gridpoints, half filter size is %d gridpoints.\n",FILT_SIZE_GRAD,hfs);
				filterpart=matrix(1,abs(FILT_SIZE_GRAD),1,abs(FILT_SIZE_GRAD));
				model_tmp = matrix(-hfs+1,NYG+hfs,-hfs+1,NXG+hfs);
	  			break;
			
			case 2:
				if (FILT_SIZE==0)	return;
		      		if (!(FILT_SIZE % 2)) {
		      		if (FILT_SIZE > 0)	FILT_SIZE += 1;
		      		else			FILT_SIZE -= 1;
		      		}
	  			hfs = abs(FILT_SIZE)/2;
				printf("\n ----------------------------------------------------------------\n");
				printf("\n Filter size is %d gridpoints, half filter size is %d gridpoints.\n",FILT_SIZE,hfs);
				filterpart=matrix(1,abs(FILT_SIZE),1,abs(FILT_SIZE));
				model_tmp = matrix(-hfs+1,NYG+hfs,-hfs+1,NXG+hfs);
	  			break;
			}
		      	model_med = matrix(1,NYG,1,NXG);
		      	
		    	if(sws==1){
			sprintf(jac_tmp,"%s_g.old",JACOBIAN);}   

			if(sws==2){
			sprintf(jac_tmp,"%s_g_u.old",JACOBIAN);}    
	
			if(sws==3){
			sprintf(jac_tmp,"%s_g_rho.old",JACOBIAN);}  
			
			if(sws==4){
			sprintf(jac_tmp,"%s_vp.bin",INV_MODELFILE);}   

			if(sws==5){
			sprintf(jac_tmp,"%s_vs.bin",INV_MODELFILE);}    
	
			if(sws==6){
			sprintf(jac_tmp,"%s_rho.bin",INV_MODELFILE);}   
	
		      	model=fopen(jac_tmp,"rb");
		      	if (model==NULL) err(" Could not open file !");
		
		      	/* load merged model */
		      	for (i=1;i<=NXG;i++){
				for (j=1;j<=NYG;j++){
					      fread(&grad, sizeof(float), 1, model);
				      	model_tmp[j][i]=grad;
			      	}	
		      	}
		
		      fclose(model);
		    
		      /* apply 2D-Gaussian filter on vp and vs model */
			      /* extrapolate array */
			      /* left/right boundary */
			      for (j=1;j<=NYG;j++){
				      for (i=-hfs+1;i<=0;i++){
					model_tmp[j][i] = model_tmp[j][1];}
				      for (i=NXG+1;i<=NXG+hfs;i++){
					model_tmp[j][i] = model_tmp[j][NXG];}
			      }
			      /* top/bottom boundary incl. corners */
			      for (j=-hfs+1;j<=0;j++){
				      for (i=-hfs+1;i<=NXG+hfs;i++){
					model_tmp[j][i] = model_tmp[1][i];}
			      }
			      for (j=NYG+1;j<=NYG+hfs;j++){
				      for (i=-hfs+1;i<=NXG+hfs;i++){
					model_tmp[j][i] = model_tmp[NYG][i];}
			      }
		
			/* filter */
			      for (j=1;j<=NYG;j++){
				for (i=1;i<=NXG;i++){
					      /* create a filtersize x filtersize matrix */
					      for (ii=-hfs;ii<=hfs;ii++){
						      for (jj=-hfs;jj<=hfs;jj++){
							      
							      filterpart[ii+hfs+1][jj+hfs+1] = model_tmp[j+jj][i+ii];
						      }
						}
					      /* filter */
					      switch (filter){
					      case 1:
					      		model_med[j][i] = median2d(filterpart,abs(FILT_SIZE_GRAD),abs(FILT_SIZE_GRAD));
							break;
					      case 2:
					      		model_med[j][i] = median2d(filterpart,abs(FILT_SIZE),abs(FILT_SIZE));
							break;
					      }		
							
				      }
			      }
			      
			/* output of smoothed gradient / model*/      
			if(sws==1){
			sprintf(jac_tmp,"%s_tmp_g.old",JACOBIAN);}   

			if(sws==2){
			sprintf(jac_tmp,"%s_tmp_g_u.old",JACOBIAN);}    
	
			if(sws==3){
			sprintf(jac_tmp,"%s_tmp_g_rho.old",JACOBIAN);}   
			
			if(sws==4){
			sprintf(jac_tmp,"%s_vp_tmp.bin",INV_MODELFILE);}   

			if(sws==5){
			sprintf(jac_tmp,"%s_vs_tmp.bin",INV_MODELFILE);}    
	
			if(sws==6){
			sprintf(jac_tmp,"%s_rho_tmp.bin",INV_MODELFILE);} 
			      
			model=fopen(jac_tmp,"wb");
			for (i=1;i<=NXG;i++){
			  for (j=1;j<=NYG;j++){
			    
			  fwrite(&model_med[j][i],sizeof(float),1,model);

			  }
			}
			fclose(model);
			
			switch (filter){
			case 1:
				free_matrix(model_tmp,-hfs+1,NYG+hfs,-hfs+1,NXG+hfs);
				free_matrix(filterpart,1,abs(FILT_SIZE_GRAD),1,abs(FILT_SIZE_GRAD));
				break;
			case 2:
				free_matrix(model_tmp,-hfs+1,NYG+hfs,-hfs+1,NXG+hfs);
				free_matrix(filterpart,1,abs(FILT_SIZE),1,abs(FILT_SIZE));
				break;
			}
			free_matrix(model_med,1,NXG,1,NYG);
			
		}/* end of if(MYID==0)*/
		
	MPI_Barrier(MPI_COMM_WORLD);
	
	switch (filter){
	case 1:
		smooth_meter=FILT_SIZE_GRAD*DH;
		fprintf(FP,"\n Gradient %s is smoothed with filter length of %4.2f meter.\n",jac_tmp,smooth_meter);
		break;
	case 2:
		smooth_meter=FILT_SIZE*DH;
		fprintf(FP,"\n Model %s is smoothed with filter length of %4.2f meter.\n",jac_tmp,smooth_meter);
		break ;
	}
	/* distribute smoothed gradient / model on computational nodes */
	if(sws==1){
	sprintf(jac_tmp,"%s_tmp_g.old",JACOBIAN);}   

	if(sws==2){
	sprintf(jac_tmp,"%s_tmp_g_u.old",JACOBIAN);}    
	
	if(sws==3){
	sprintf(jac_tmp,"%s_tmp_g_rho.old",JACOBIAN);}
	
	if(sws==4){
	sprintf(jac_tmp,"%s_vp_tmp.bin",INV_MODELFILE);}   

	if(sws==5){
	sprintf(jac_tmp,"%s_vs_tmp.bin",INV_MODELFILE);}    

	if(sws==6){
	sprintf(jac_tmp,"%s_rho_tmp.bin",INV_MODELFILE);}
				
	model=fopen(jac_tmp,"rb");
	if (model==NULL) err(" Could not open file! (distribute)");
	for (i=1;i<=NXG;i++){
	   for (j=1;j<=NYG;j++){
	   
                        fread(&grad, sizeof(float), 1, model);
			   			
			if ((POS[1]==((i-1)/NX)) && (POS[2]==((j-1)/NY))){
				ii=i-POS[1]*NX;
				jj=j-POS[2]*NY;

				mat[jj][ii]=grad;

			}
		}
	}
		
	fclose(model);
	
	fprintf(FP,"\n Smoothed gradient / model is distributed on computational nodes.\n");
	fprintf(FP,"\n ----------------------------------------------------------------\n");
}/* end of smoothing */