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/*===========================================================================
Copyright (C) 2001 European Southern Observatory (ESO)
This program 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; either version 2 of
the License, or (at your option) any later version.
This program 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 this program; if not, write to the Free
Software Foundation, Inc., 675 Massachusetss Ave, Cambridge,
MA 02139, USA.
Corresponding concerning ESO-MIDAS should be addressed as follows:
Internet e-mail: midas@eso.org
Postal address: European Southern Observatory
Data Management Division
Karl-Schwarzschild-Strasse 2
D 85748 Garching bei Muenchen
GERMANY
===========================================================================*/
/* Program : medianfilterframe.c */
/* Author : G. Mulas - ITAL_FLAMES Consortium */
/* Date : */
/* */
/* Purpose : Missing */
/* */
/* */
/* Input: see interface */
/* */
/* Output: */
/* */
/* DRS Functions called: */
/* none */
/* */
/* Pseudocode: */
/* Missing */
/* */
/* Version : */
/* Last modification date: 2002/08/05 */
/* Who When Why Where */
/* AMo 02-08-05 Add header header */
/*-------------------------------------------------------------------------*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <stdio.h>
#include <math.h>
#include <flames_midas_def.h>
#include <flames_medianfilterframe.h>
#include <flames_uves.h>
#include <flames_newmatrix.h>
static int
fdcomp(const void *pixel1, const void *pixel2);
flames_err medianfilterframe(flames_frame *myframe, int32_t xhalfwindow,
int32_t yhalfwindow, int32_t maxiters,
double kappa2)
{
frame_mask **badpixeltemp=0;
frame_mask **pixtocheck=0;
frame_data *pixbuf=0;
frame_data **thres2array=0;
int32_t badpixnum=0;
int32_t maxpixnum=0;
int32_t iters=0;
int32_t iy=0;
int32_t iylow=0;
int32_t iyhigh=0;
int32_t iy2=0;
int32_t ix=0;
int32_t ixlow=0;
int32_t ixhigh=0;
int32_t ix2=0;
int32_t pixnum=0;
int32_t medindex=0;
frame_data *fdvecbuf1=0;
frame_data *fdvecbuf3=0;
int32_t totpixuplimit=0;
int32_t iyixoffset=0;
int32_t iyixindex=0;
int32_t iy2ix2offset=0;
int32_t iy2ix2index=0;
maxpixnum = (1+2*yhalfwindow)*(1+2*xhalfwindow)-1;
totpixuplimit = (myframe->subrows*myframe->subcols)-1;
if (maxpixnum>0) {
double kappa2bis = kappa2/10;
badpixeltemp = fmmatrix(0, myframe->subrows-1, 0, myframe->subcols-1);
pixtocheck = fmmatrix(0, myframe->subrows-1, 0, myframe->subcols-1);
thres2array = fdmatrix(0, myframe->subrows-1, 0, myframe->subcols-1);
pixbuf = fdvector(0,maxpixnum);
badpixnum = 1;
frame_mask* fmvecbuf1 = myframe->badpixel[0];
frame_mask* fmvecbuf2 = pixtocheck[0];
frame_mask* fmvecbuf3 = badpixeltemp[0];
fdvecbuf1 = myframe->frame_array[0];
frame_data* fdvecbuf2 = myframe->frame_sigma[0];
fdvecbuf3 = thres2array[0];
/* copy the old badpixel mask onto the temporary one
(a memcpy would be faster) */
memcpy(fmvecbuf2, fmvecbuf1,
(size_t) (myframe->subrows*myframe->subcols*sizeof(frame_mask)));
memcpy(fmvecbuf3, fmvecbuf1,
(size_t) (myframe->subrows*myframe->subcols*sizeof(frame_mask)));
for (ix=0; ix<=totpixuplimit; ix++) {
fdvecbuf3[ix] = kappa2bis*fdvecbuf1[ix]*fdvecbuf1[ix];
}
for (iters=1; badpixnum>0 && iters<=maxiters; iters++) {
badpixnum = 0;
for (iy=0; iy<=(myframe->subrows-1); iy++) {
iyixoffset = iy*myframe->subcols;
if ((iylow=iy-yhalfwindow)<0) iylow=0;
if ((iyhigh=iy+yhalfwindow)>(myframe->subrows-1))
iyhigh=myframe->subrows-1;
for (ix=0; ix<=(myframe->subcols-1); ix++) {
iyixindex = iyixoffset+ix;
/* only try to filter supposedly good pixels AND we did not check
it already in the same conditions */
if ((fmvecbuf1[iyixindex]==0)&&(fmvecbuf2[iyixindex]==0)) {
if ((ixlow=ix-xhalfwindow)<0) ixlow=0;
if ((ixhigh=ix+xhalfwindow)>(myframe->subcols-1))
ixhigh=myframe->subcols-1;
pixnum=0;
for (iy2=iylow; iy2<=iyhigh; iy2++) {
iy2ix2offset = iy2*myframe->subcols;
for (ix2=ixlow; ix2<=ixhigh; ix2++) {
iy2ix2index = iy2ix2offset+ix2;
if (fmvecbuf1[iy2ix2index]==0) {
pixbuf[pixnum]=fdvecbuf1[iy2ix2index];
pixnum++;
}
}
}
/* obviously, there is no point in finding the median and
filtering if there are no other good pixels around this
one */
if (pixnum>1) {
frame_data medpixel=0;
/* sort the pixels */
qsort(pixbuf, (size_t) pixnum, sizeof(frame_data), fdcomp);
/* now that the pixels are sorted, pick the median */
if (2*(pixnum/2) != pixnum) {
/* pixnum is odd, just pick the right index */
medindex = (pixnum-1)/2;
medpixel = pixbuf[medindex];
}
else {
/* pixnum is even, compute the average of the two
median values */
medindex = pixnum/2;
medpixel = (pixbuf[medindex-1]+pixbuf[medindex])/2;
}
frame_data plaindiff = medpixel-fdvecbuf1[iyixindex];
frame_data squarediff = plaindiff*plaindiff;
frame_data pixelthres = kappa2*fdvecbuf2[iyixindex];
frame_data pixelthres2 = kappa2bis*medpixel*medpixel;
if (pixelthres2>fdvecbuf3[iyixindex])
pixelthres2 = fdvecbuf3[iyixindex];
if (pixelthres<pixelthres2) pixelthres = pixelthres2;
if (squarediff > pixelthres) {
/* mark this pixel as bad in the new badpixel mask */
fmvecbuf3[iyixindex] = 1;
badpixnum++;
/* we must check again the neighbouring pixels */
for (iy2=iylow; iy2<=iyhigh; iy2++) {
iy2ix2offset = iy2*myframe->subcols;
for (ix2=ixlow; ix2<=ixhigh; ix2++) {
iy2ix2index = iy2ix2offset+ix2;
fmvecbuf2[iy2ix2index]=0;
}
}
}
else {
/* avoid checking this pixel over and over again */
fmvecbuf2[iyixindex]=1;
}
}
}
}
}
/* copy the new badpixel mask onto the old one
(a memcpy would be faster) */
memcpy(fmvecbuf1, fmvecbuf3,
(size_t) (myframe->subrows*myframe->subcols*sizeof(frame_mask)));
}
free_fdvector(pixbuf, 0, maxpixnum);
free_fmmatrix(badpixeltemp, 0, myframe->subrows-1, 0, myframe->subcols-1);
free_fmmatrix(pixtocheck, 0, myframe->subrows-1, 0, myframe->subcols-1);
free_fdmatrix(thres2array, 0, myframe->subrows-1, 0, myframe->subcols-1);
}
return NOERR;
}
static int
fdcomp(const void *p1, const void *p2)
{
const frame_data * pixel1=(const frame_data * ) p1;
const frame_data * pixel2=(const frame_data * ) p2;
if (*pixel1 > *pixel2) return -1;
else if (*pixel1 < *pixel2) return 1;
else return 0;
}
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