/
filter.h
executable file
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/
filter.h
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/*
Copyright (C) 2006 Pedro Felzenszwalb
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* simple filters */
#ifndef FILTER_H
#define FILTER_H
#include <vector>
#include <cmath>
#include "image.h"
#include "misc.h"
#include "convolve.h"
#include "imconv.h"
#define WIDTH 4.0
/* normalize mask so it integrates to one */
void normalize(std::vector<float> &mask);
/* make filters */
#define MAKE_FILTER(name, fun) \
static std::vector<float> make_ ## name (float sigma) { \
sigma = std::max(sigma, 0.01F); \
int len = (int)ceil(sigma * WIDTH) + 1; \
std::vector<float> mask(len); \
for (int i = 0; i < len; i++) { \
mask[i] = fun; \
} \
return mask; \
}
MAKE_FILTER(fgauss, exp(-0.5*square(i/sigma)));
/* convolve image with gaussian filter */
image<float> *smooth(image<float> *src, float sigma);
/* convolve image with gaussian filter */
image<float> *smooth(image<uchar> *src, float sigma);
/* compute laplacian */
image<float> *laplacian(image<float> *src);
#endif