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/*--------------------------------------------------------------------*/
/*
* This Quickselect routine is based on the algorithm described in
* "Numerical recipies in C", Second Edition,
* Cambridge University Press, 1992, Section 8.5, ISBN 0-521-43108-5
*/
#include "Python.h"
#define NO_IMPORT_ARRAY
#include "numpy/noprefix.h"
void f_medfilt2(float*,float*,intp*,intp*);
void d_medfilt2(double*,double*,intp*,intp*);
void b_medfilt2(unsigned char*,unsigned char*,intp*,intp*);
extern char *check_malloc (int);
#define ELEM_SWAP(a,b) { register float t=(a);(a)=(b);(b)=t; }
float f_quick_select(float arr[], int n)
{
int low, high ;
int median;
int middle, ll, hh;
low = 0 ; high = n-1 ; median = (low + high) / 2;
for (;;) {
if (high <= low) /* One element only */
return arr[median] ;
if (high == low + 1) { /* Two elements only */
if (arr[low] > arr[high])
ELEM_SWAP(arr[low], arr[high]) ;
return arr[median] ;
}
/* Find median of low, middle and high items; swap into position low */
middle = (low + high) / 2;
if (arr[middle] > arr[high]) ELEM_SWAP(arr[middle], arr[high]) ;
if (arr[low] > arr[high]) ELEM_SWAP(arr[low], arr[high]) ;
if (arr[middle] > arr[low]) ELEM_SWAP(arr[middle], arr[low]) ;
/* Swap low item (now in position middle) into position (low+1) */
ELEM_SWAP(arr[middle], arr[low+1]) ;
/* Nibble from each end towards middle, swapping items when stuck */
ll = low + 1;
hh = high;
for (;;) {
do ll++; while (arr[low] > arr[ll]) ;
do hh--; while (arr[hh] > arr[low]) ;
if (hh < ll)
break;
ELEM_SWAP(arr[ll], arr[hh]) ;
}
/* Swap middle item (in position low) back into correct position */
ELEM_SWAP(arr[low], arr[hh]) ;
/* Re-set active partition */
if (hh <= median)
low = ll;
if (hh >= median)
high = hh - 1;
}
}
#undef ELEM_SWAP
#define ELEM_SWAP(a,b) { register double t=(a);(a)=(b);(b)=t; }
double d_quick_select(double arr[], int n)
{
int low, high ;
int median;
int middle, ll, hh;
low = 0 ; high = n-1 ; median = (low + high) / 2;
for (;;) {
if (high <= low) /* One element only */
return arr[median] ;
if (high == low + 1) { /* Two elements only */
if (arr[low] > arr[high])
ELEM_SWAP(arr[low], arr[high]) ;
return arr[median] ;
}
/* Find median of low, middle and high items; swap into position low */
middle = (low + high) / 2;
if (arr[middle] > arr[high]) ELEM_SWAP(arr[middle], arr[high]) ;
if (arr[low] > arr[high]) ELEM_SWAP(arr[low], arr[high]) ;
if (arr[middle] > arr[low]) ELEM_SWAP(arr[middle], arr[low]) ;
/* Swap low item (now in position middle) into position (low+1) */
ELEM_SWAP(arr[middle], arr[low+1]) ;
/* Nibble from each end towards middle, swapping items when stuck */
ll = low + 1;
hh = high;
for (;;) {
do ll++; while (arr[low] > arr[ll]) ;
do hh--; while (arr[hh] > arr[low]) ;
if (hh < ll)
break;
ELEM_SWAP(arr[ll], arr[hh]) ;
}
/* Swap middle item (in position low) back into correct position */
ELEM_SWAP(arr[low], arr[hh]) ;
/* Re-set active partition */
if (hh <= median)
low = ll;
if (hh >= median)
high = hh - 1;
}
}
#undef ELEM_SWAP
#define ELEM_SWAP(a,b) { register unsigned char t=(a);(a)=(b);(b)=t; }
unsigned char b_quick_select(unsigned char arr[], int n)
{
int low, high ;
int median;
int middle, ll, hh;
low = 0 ; high = n-1 ; median = (low + high) / 2;
for (;;) {
if (high <= low) /* One element only */
return arr[median] ;
if (high == low + 1) { /* Two elements only */
if (arr[low] > arr[high])
ELEM_SWAP(arr[low], arr[high]) ;
return arr[median] ;
}
/* Find median of low, middle and high items; swap into position low */
middle = (low + high) / 2;
if (arr[middle] > arr[high]) ELEM_SWAP(arr[middle], arr[high]) ;
if (arr[low] > arr[high]) ELEM_SWAP(arr[low], arr[high]) ;
if (arr[middle] > arr[low]) ELEM_SWAP(arr[middle], arr[low]) ;
/* Swap low item (now in position middle) into position (low+1) */
ELEM_SWAP(arr[middle], arr[low+1]) ;
/* Nibble from each end towards middle, swapping items when stuck */
ll = low + 1;
hh = high;
for (;;) {
do ll++; while (arr[low] > arr[ll]) ;
do hh--; while (arr[hh] > arr[low]) ;
if (hh < ll)
break;
ELEM_SWAP(arr[ll], arr[hh]) ;
}
/* Swap middle item (in position low) back into correct position */
ELEM_SWAP(arr[low], arr[hh]) ;
/* Re-set active partition */
if (hh <= median)
low = ll;
if (hh >= median)
high = hh - 1;
}
}
#undef ELEM_SWAP
/* 2-D median filter with zero-padding on edges. */
void d_medfilt2(double* in, double* out, intp* Nwin, intp* Ns)
{
int nx, ny, hN[2];
int pre_x, pre_y, pos_x, pos_y;
int subx, suby, k, totN;
double *myvals, *fptr1, *fptr2, *ptr1, *ptr2;
totN = Nwin[0] * Nwin[1];
myvals = (double *) check_malloc( totN * sizeof(double));
hN[0] = Nwin[0] >> 1;
hN[1] = Nwin[1] >> 1;
ptr1 = in;
fptr1 = out;
for (ny = 0; ny < Ns[0]; ny++)
for (nx = 0; nx < Ns[1]; nx++) {
pre_x = hN[1];
pre_y = hN[0];
pos_x = hN[1];
pos_y = hN[0];
if (nx < hN[1]) pre_x = nx;
if (nx >= Ns[1] - hN[1]) pos_x = Ns[1] - nx - 1;
if (ny < hN[0]) pre_y = ny;
if (ny >= Ns[0] - hN[0]) pos_y = Ns[0] - ny - 1;
fptr2 = myvals;
ptr2 = ptr1 - pre_x - pre_y*Ns[1];
for (suby = -pre_y; suby <= pos_y; suby++) {
for (subx = -pre_x; subx <= pos_x; subx++)
*fptr2++ = *ptr2++;
ptr2 += Ns[1] - (pre_x + pos_x + 1);
}
ptr1++;
/* Zero pad */
for (k = (pre_x + pos_x + 1)*(pre_y + pos_y + 1); k < totN; k++)
*fptr2++ = 0.0;
/* *fptr1++ = median(myvals,totN); */
*fptr1++ = d_quick_select(myvals,totN);
}
}
/* 2-D median filter with zero-padding on edges. */
void f_medfilt2(float* in, float* out, intp* Nwin, intp* Ns)
{
int nx, ny, hN[2];
int pre_x, pre_y, pos_x, pos_y;
int subx, suby, k, totN;
float *myvals, *fptr1, *fptr2, *ptr1, *ptr2;
totN = Nwin[0] * Nwin[1];
myvals = (float *) check_malloc( totN * sizeof(float));
hN[0] = Nwin[0] >> 1;
hN[1] = Nwin[1] >> 1;
ptr1 = in;
fptr1 = out;
for (ny = 0; ny < Ns[0]; ny++)
for (nx = 0; nx < Ns[1]; nx++) {
pre_x = hN[1];
pre_y = hN[0];
pos_x = hN[1];
pos_y = hN[0];
if (nx < hN[1]) pre_x = nx;
if (nx >= Ns[1] - hN[1]) pos_x = Ns[1] - nx - 1;
if (ny < hN[0]) pre_y = ny;
if (ny >= Ns[0] - hN[0]) pos_y = Ns[0] - ny - 1;
fptr2 = myvals;
ptr2 = ptr1 - pre_x - pre_y*Ns[1];
for (suby = -pre_y; suby <= pos_y; suby++) {
for (subx = -pre_x; subx <= pos_x; subx++)
*fptr2++ = *ptr2++;
ptr2 += Ns[1] - (pre_x + pos_x + 1);
}
ptr1++;
/* Zero pad */
for (k = (pre_x + pos_x + 1)*(pre_y + pos_y + 1); k < totN; k++)
*fptr2++ = 0.0;
/* *fptr1++ = median(myvals,totN); */
*fptr1++ = f_quick_select(myvals,totN);
}
}
/* 2-D median filter with zero-padding on edges. */
void b_medfilt2(unsigned char *in, unsigned char *out, intp* Nwin, intp* Ns)
{
int nx, ny, hN[2];
int pre_x, pre_y, pos_x, pos_y;
int subx, suby, k, totN;
unsigned char *myvals, *fptr1, *fptr2, *ptr1, *ptr2;
totN = Nwin[0] * Nwin[1];
myvals = (unsigned char *) check_malloc( totN * sizeof(unsigned char));
hN[0] = Nwin[0] >> 1;
hN[1] = Nwin[1] >> 1;
ptr1 = in;
fptr1 = out;
for (ny = 0; ny < Ns[0]; ny++)
for (nx = 0; nx < Ns[1]; nx++) {
pre_x = hN[1];
pre_y = hN[0];
pos_x = hN[1];
pos_y = hN[0];
if (nx < hN[1]) pre_x = nx;
if (nx >= Ns[1] - hN[1]) pos_x = Ns[1] - nx - 1;
if (ny < hN[0]) pre_y = ny;
if (ny >= Ns[0] - hN[0]) pos_y = Ns[0] - ny - 1;
fptr2 = myvals;
ptr2 = ptr1 - pre_x - pre_y*Ns[1];
for (suby = -pre_y; suby <= pos_y; suby++) {
for (subx = -pre_x; subx <= pos_x; subx++)
*fptr2++ = *ptr2++;
ptr2 += Ns[1] - (pre_x + pos_x + 1);
}
ptr1++;
/* Zero pad */
for (k = (pre_x + pos_x + 1)*(pre_y + pos_y + 1); k < totN; k++)
*fptr2++ = 0.0;
/* *fptr1++ = median(myvals,totN); */
*fptr1++ = b_quick_select(myvals,totN);
}
}
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