/usr/include/vigra/shockfilter.hxx is in libvigraimpex-dev 1.10.0+git20160211.167be93+dfsg-2+b5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 | /************************************************************************/
/* */
/* Copyright 2007-2014 by Benjamin Seppke */
/* Cognitive Systems Group, University of Hamburg, Germany */
/* */
/************************************************************************/
#ifndef VIGRA_SHOCKFILTER_HXX
#define VIGRA_SHOCKFILTER_HXX
#include "basicimage.hxx"
#include "convolution.hxx"
#include "tensorutilities.hxx"
namespace vigra {
/********************************************************/
/* */
/* Coherence enhancing shock filter */
/* */
/********************************************************/
/**
This function calculates of the coherence enhancing shock filter proposed by
J. Weickert (2002): Coherence-Enhancing Show Filters.
It uses the structure tensor information of an image and an iterative discrete upwinding scheme
instead of pure dilation and erosion to perform the necessary morphological operations
on the image.
*/
//@{
/** \brief This function calculates discrete upwinding scheme proposed by J. Weickert (2002) in Coherence-Enhancing Show Filters.
An image is upwinded positively (dilation), if the given second src is positive.
Otherwise it is upwinds negatively (eroded). The effect can be steered by an upwinding
factor.
<b> Declarations:</b>
pass 2D array views:
\code
namespace vigra {
template <class T1, class S1,
class T2, class S2
class T3, class S3>
void
upwindImage(MultiArrayView<2, T1, S1> const & src,
MultiArrayView<2, T2, S2> const & src2,
MultiArrayView<2, T3, S3> dest,
float upwind_factor_h);
}
\endcode
\deprecatedAPI{upwindImage}
pass \ref ImageIterators and \ref DataAccessors :
\code
namespace vigra {
template <class SrcIterator, class SrcAccessor,
class Src2Iterator, class Src2Accessor,
class DestIterator, class DestAccessor>
void upwindImage(SrcIterator s_ul, SrcIterator s_lr, SrcAccessor s_acc,
Src2Iterator s2_ul, Src2Accessor s2_acc,
DestIterator d_ul, DestAccessor d_acc,
float upwind_factor_h)
}
\endcode
use argument objects in conjunction with \ref ArgumentObjectFactories :
\code
namespace vigra {
template <class SrcIterator, class SrcAccessor,
class Src2Iterator, class Src2Accessor,
class DestIterator, class DestAccessor>
void
upwindImage(triple<SrcIterator, SrcIterator, SrcAccessor> src,
pair<Src2Iterator, Src2Accessor> src2,
pair<DestIterator, DestAccessor> dest,
float upwind_factor_h);
}
\endcode
\deprecatedEnd
*/
doxygen_overloaded_function(template <...> void upwindImage)
template <class SrcIterator, class SrcAccessor,
class Src2Iterator, class Src2Accessor,
class DestIterator, class DestAccessor>
void upwindImage(SrcIterator s_ul, SrcIterator s_lr, SrcAccessor s_acc,
Src2Iterator s2_ul, Src2Accessor s2_acc,
DestIterator d_ul, DestAccessor d_acc,
float upwind_factor_h)
{
using namespace std;
typedef typename SrcIterator::difference_type DiffType;
DiffType shape = s_lr - s_ul;
typedef typename SrcAccessor::value_type SrcType;
typedef typename DestAccessor::value_type ResultType;
SrcType upper, lower, left, right, center;
ResultType fx, fy;
for(int y=0; y<shape[1]; ++y)
{
for(int x=0; x<shape[0]; ++x)
{
upper = s_acc(s_ul + Diff2D(x, max(0, y-1)));
lower = s_acc(s_ul + Diff2D(x, min(shape[1]-1, y+1)));
left = s_acc(s_ul + Diff2D(max(0, x-1), y));
right = s_acc(s_ul + Diff2D(min(shape[0]-1, x+1), y));
center = s_acc(s_ul + Diff2D(x, y));
if(s2_acc(s2_ul+Diff2D(x,y))<0)
{
fx = max(max(right - center, left - center), 0.0f);
fy = max(max(lower - center, upper - center), 0.0f);
d_acc.set (center + upwind_factor_h*sqrt( fx*fx + fy*fy), d_ul+Diff2D(x,y));
}
else
{
fx = max(max(center - right, center - left), 0.0f);
fy = max(max(center - lower, center - upper), 0.0f);
d_acc.set (center - upwind_factor_h*sqrt( fx*fx + fy*fy), d_ul+Diff2D(x,y));
}
}
}
}
template <class SrcIterator, class SrcAccessor,
class Src2Iterator, class Src2Accessor,
class DestIterator, class DestAccessor>
inline void upwindImage(triple<SrcIterator, SrcIterator, SrcAccessor> s,
pair<Src2Iterator, Src2Accessor> s2,
pair<DestIterator, DestAccessor> d,
float upwind_factor_h)
{
upwindImage(s.first, s.second, s.third, s2.first, s2.second, d.first, d.second, upwind_factor_h);
}
template <class T1, class S1,
class T2, class S2,
class T3, class S3>
inline void upwindImage(MultiArrayView<2, T1, S1> const & src,
MultiArrayView<2, T2, S2> const & src2,
MultiArrayView<2, T3, S3> dest,
float upwind_factor_h)
{
vigra_precondition(src.shape() == src2.shape() && src.shape() == dest.shape(),
"vigra::upwindImage(): shape mismatch between input and output.");
upwindImage(srcImageRange(src),
srcImage(src2),
destImage(dest),
upwind_factor_h);
}
/** \brief This function calculates of the coherence enhancing shock filter proposed by J. Weickert (2002) in Coherence-Enhancing Show Filters.
<b> Declarations:</b>
pass 2D array views:
\code
namespace vigra {
template <class T1, class S1,
class T2, class S2>
void
shockFilter(MultiArrayView<2, T1, S1> const & src,
MultiArrayView<2, T2, S2> dest,
float sigma, float rho, float upwind_factor_h,
unsigned int iterations);
}
\endcode
\deprecatedAPI{shockFilter}
pass \ref ImageIterators and \ref DataAccessors :
\code
namespace vigra {
template <class SrcIterator, class SrcAccessor,
class DestIterator, class DestAccessor>
void shockFilter(SrcIterator supperleft,
SrcIterator slowerright, SrcAccessor sa,
DestIterator dupperleft, DestAccessor da,
float sigma, float rho, float upwind_factor_h,
unsigned int iterations);
}
\endcode
use argument objects in conjunction with \ref ArgumentObjectFactories :
\code
namespace vigra {
template <class SrcIterator, class SrcAccessor,
class DestIterator, class DestAccessor>
void
shockFilter(triple<SrcIterator, SrcIterator, SrcAccessor> src,
pair<DestIterator, DestAccessor> dest,
float sigma, float rho, float upwind_factor_h,
unsigned int iterations);
}
\endcode
\deprecatedEnd
<b> Usage:</b>
<b>\#include</b> \<vigra/shockilter.hxx\><br/>
Namespace: vigra
\code
unsigned int w=1000, h=1000;
MultiArray<2, float> src(w,h), dest(w,h);
...
// apply a shock-filter:
shockFilter(src, dest, 1.0, 5.0, 0.3, 5);
\endcode
<b> Preconditions:</b>
The image must be larger than the window size of the filter.
*/
doxygen_overloaded_function(template <...> void upwindImage)
template <class SrcIterator, class SrcAccessor,
class DestIterator, class DestAccessor>
void shockFilter(SrcIterator s_ul, SrcIterator s_lr, SrcAccessor s_acc,
DestIterator d_ul, DestAccessor d_acc,
float sigma, float rho, float upwind_factor_h,
unsigned int iterations)
{
typedef typename SrcIterator::difference_type DiffType;
DiffType shape = s_lr - s_ul;
unsigned int w = shape[0],
h = shape[1];
FVector3Image tensor(w,h);
FVector3Image eigen(w,h);
FImage hxx(w,h), hxy(w,h), hyy(w,h), temp(w,h) ,result(w,h);
float c, s, v_xx, v_xy, v_yy;
copyImage(srcIterRange(s_ul, s_lr, s_acc), destImage(result));
for(unsigned int i = 0; i<iterations; ++i)
{
structureTensor(srcImageRange(result), destImage(tensor), sigma, rho);
tensorEigenRepresentation(srcImageRange(tensor), destImage(eigen));
hessianMatrixOfGaussian(srcImageRange(result),
destImage(hxx), destImage(hxy), destImage(hyy), sigma);
for(int y=0; y<shape[1]; ++y)
{
for(int x=0; x<shape[0]; ++x)
{
c = cos(eigen(x,y)[2]);
s = sin(eigen(x,y)[2]);
v_xx = hxx(x,y);
v_xy = hxy(x,y);
v_yy = hyy(x,y);
//store signum image in hxx (safe, because no other will ever access hxx(x,y)
hxx(x,y) = c*c*v_xx + 2*c*s*v_xy + s*s*v_yy;
}
}
upwindImage(srcImageRange(result),srcImage(hxx), destImage(temp), upwind_factor_h);
result = temp;
}
copyImage(srcImageRange(result), destIter(d_ul, d_acc));
}
template <class SrcIterator, class SrcAccessor,
class DestIterator, class DestAccessor>
inline void shockFilter(triple<SrcIterator, SrcIterator, SrcAccessor> s,
pair<DestIterator, DestAccessor> d,
float sigma, float rho, float upwind_factor_h,
unsigned int iterations)
{
shockFilter(s.first, s.second, s.third,
d.first, d.second,
sigma, rho, upwind_factor_h,
iterations);
}
template <class T1, class S1,
class T2, class S2>
inline void shockFilter(MultiArrayView<2, T1, S1> const & src,
MultiArrayView<2, T2, S2> dest,
float sigma, float rho, float upwind_factor_h,
unsigned int iterations)
{
vigra_precondition(src.shape() == dest.shape(),
"vigra::shockFilter(): shape mismatch between input and output.");
shockFilter(srcImageRange(src),
destImage(dest),
sigma, rho, upwind_factor_h,
iterations);
}
} //end of namespace vigra
#endif //VIGRA_SHOCKFILTER_HXX
|