vigra - vigra/multi_histogram.hxx Source File

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multi_histogram.hxx |

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35
36 #ifndef VIGRA_MULTI_HISTOGRAMM_HXX
37 #define VIGRA_MULTI_HISTOGRAMM_HXX
38
39 #include "multi_array.hxx"
40 #include "tinyvector.hxx"
41 #include "multi_gridgraph.hxx"
42 #include "multi_convolution.hxx"
43
44
45 namespace vigra{
46
47
48 template< unsigned int DIM , class T_DATA ,unsigned int CHANNELS, class T_HIST >
49 void multiGaussianHistogram(
50 const MultiArrayView<DIM, TinyVector<T_DATA,CHANNELS> > & image,
51 const TinyVector<T_DATA,CHANNELS> minVals,
52 const TinyVector<T_DATA,CHANNELS> maxVals,
53 const size_t bins,
54 const float sigma,
55 const float sigmaBin,
56 MultiArrayView<DIM+2 , T_HIST> histogram
57 ){
58 typedef vigra::GridGraph< DIM , undirected_tag> Graph;
59 typedef typename Graph::NodeIt graph_scanner;
60 typedef typename Graph::Node Node;
61 typedef T_HIST ValueType;
62 typedef TinyVector<ValueType,CHANNELS> ChannelsVals;
63 typedef typename MultiArrayView<DIM+2 , T_HIST>::difference_type HistCoord;
64 const Graph g(image.shape());
65 const ChannelsVals nBins(bins);
66 histogram.init(1.0);
67 // iterate over all nodes (i.e. pixels)
68 for (graph_scanner n(g); n != lemon::INVALID; ++n){
69 const Node node(*n);
70 ChannelsVals binIndex = image[node];
71 binIndex -=minVals;
72 binIndex /=maxVals;
73 binIndex *=nBins;
74 HistCoord histCoord;
75 for(size_t d=0;d<DIM;++d){
76 histCoord[d]=node[d];
77 }
78 for(size_t c=0;c<CHANNELS;++c){
79 const float fi = binIndex[c];
80 const size_t bi = std::floor(fi+0.5);
81 histCoord[DIM]=std::min(bi,static_cast<size_t>(bins-1));
82 histCoord[DIM+1]=c;
83 histogram[histCoord]+=1.0;
84 }
85 }
86
87 //MultiArray<DIM+2 , T_HIST> histogramBuffer(histogram);
88 Kernel1D<float> gauss,gaussBin;
89 gauss.initGaussian(sigma);
90 gaussBin.initGaussian(sigmaBin);
91 for(size_t c=0;c<CHANNELS;++c){
92
93 // histogram for one channel
94 MultiArrayView<DIM+1,T_HIST> histc = histogram.bindOuter(c);
95 //MultiArrayView<DIM+1,T_HIST> histcBuffer = histogram.bindOuter(c);
96
97 ConvolutionOptions<DIM+1> opts;
98 TinyVector<double, DIM+1> sigmaVec(sigma);
99 sigmaVec[DIM] = sigmaBin;
100 opts.stdDev(sigmaVec);
101
102 // convolve spatial dimensions
103 gaussianSmoothMultiArray(histc, histc, opts);
104
105 }
106
107 }
108
109 template< unsigned int DIM , class T_DATA, class T_HIST >
110 void multiGaussianCoHistogram(
111 const MultiArrayView<DIM, T_DATA > & imageA,
112 const MultiArrayView<DIM, T_DATA > & /*imageB*/,
113 const TinyVector<T_DATA,2> & minVals,
114 const TinyVector<T_DATA,2> & maxVals,
115 const TinyVector<int,2> & nBins,
116 const TinyVector<float,3> & sigma,
117 MultiArrayView<DIM+2, T_HIST> histogram
118 ){
119 typedef vigra::GridGraph< DIM , undirected_tag> Graph;
120 typedef typename Graph::NodeIt graph_scanner;
121 typedef typename Graph::Node Node;
122 typedef typename MultiArrayView<DIM+2 , T_HIST>::difference_type HistCoord;
123 const Graph g(imageA.shape());
124 histogram.init(0.0);
125 // iterate over all nodes (i.e. pixels)
126 for (graph_scanner n(g); n != lemon::INVALID; ++n){
127
128 const Node node(*n);
129 T_DATA binIndexA = imageA[node];
130 T_DATA binIndexB = imageA[node];
131
132 binIndexA -=minVals[0];
133 binIndexA /=maxVals[0];
134 binIndexA *=nBins[0];
135
136 binIndexB -=minVals[1];
137 binIndexB /=maxVals[1];
138 binIndexB *=nBins[1];
139
140 HistCoord histCoord;
141 for(size_t d=0;d<DIM;++d)
142 histCoord[d]=node[d];
143
144 histCoord[DIM]=binIndexA;
145 histCoord[DIM+1]=binIndexB;
146
147 const float fiA = binIndexA;
148 const unsigned int biA = std::floor(fiA+0.5);
149 const unsigned int biB = std::floor(fiA+0.5);
150 histCoord[DIM]=std::min(biA,static_cast<unsigned int>(nBins[0]-1));
151 histCoord[DIM+1]=std::min(biB,static_cast<unsigned int>(nBins[1]-1));
152 histogram[histCoord]+=1.0;
153
154 }
155
156 MultiArray<DIM+2 , T_HIST> histogramBuffer(histogram);
157 Kernel1D<float> gaussS,gaussA,gaussB;
158 gaussS.initGaussian(sigma[0]);
159 gaussA.initGaussian(sigma[1]);
160 gaussB.initGaussian(sigma[2]);
161
162 if(DIM==2){
163 convolveMultiArrayOneDimension(srcMultiArrayRange(histogram), destMultiArray(histogramBuffer), 0, gaussS);
164 convolveMultiArrayOneDimension(srcMultiArrayRange(histogramBuffer), destMultiArray(histogram), 1, gaussS);
165 convolveMultiArrayOneDimension(srcMultiArrayRange(histogram), destMultiArray(histogramBuffer), 2, gaussA);
166 convolveMultiArrayOneDimension(srcMultiArrayRange(histogramBuffer), destMultiArray(histogram), 3, gaussB);
167 }
168 else if(DIM==3){
169 convolveMultiArrayOneDimension(srcMultiArrayRange(histogram), destMultiArray(histogramBuffer), 0, gaussS);
170 convolveMultiArrayOneDimension(srcMultiArrayRange(histogramBuffer), destMultiArray(histogram), 1, gaussS);
171 convolveMultiArrayOneDimension(srcMultiArrayRange(histogram), destMultiArray(histogramBuffer), 2, gaussS);
172 convolveMultiArrayOneDimension(srcMultiArrayRange(histogramBuffer), destMultiArray(histogram), 3, gaussA);
173 convolveMultiArrayOneDimension(srcMultiArrayRange(histogram), destMultiArray(histogramBuffer), 4, gaussB);
174 histogram=histogramBuffer;
175 }
176 else if(DIM==4){
177 convolveMultiArrayOneDimension(srcMultiArrayRange(histogram), destMultiArray(histogramBuffer), 0, gaussS);
178 convolveMultiArrayOneDimension(srcMultiArrayRange(histogramBuffer), destMultiArray(histogram), 1, gaussS);
179 convolveMultiArrayOneDimension(srcMultiArrayRange(histogram), destMultiArray(histogramBuffer), 2, gaussS);
180 convolveMultiArrayOneDimension(srcMultiArrayRange(histogramBuffer), destMultiArray(histogram), 3, gaussS);
181 convolveMultiArrayOneDimension(srcMultiArrayRange(histogram), destMultiArray(histogramBuffer), 4, gaussA);
182 convolveMultiArrayOneDimension(srcMultiArrayRange(histogramBuffer), destMultiArray(histogram), 5, gaussA);
183 }
184 else{
185 throw std::runtime_error("not yet implemented for arbitrary dimension");
186 }
187
188 }
189
190
191
192
193 template< unsigned int DIM , class T, class V, class U>
194 void multiGaussianRankOrder(
195 const MultiArrayView<DIM, T > & image,
196 const T minVal,
197 const T maxVal,
198 const size_t bins,
199 const TinyVector<double, DIM+1> sigmas,
200 const MultiArrayView<1, V> & ranks,
201 MultiArrayView<DIM+1, U> out
202 ){
203 typedef MultiArray<DIM, T> ImgType;
204 typedef typename ImgType::difference_type ImgCoord;
205
206 typedef MultiArray<DIM+1, float> HistType;
207 typedef typename HistType::difference_type HistCoord;
208
209 typedef MultiArray<DIM+1, U> OutType;
210 typedef typename OutType::difference_type OutCoord;
211
212 // FIXME: crashes on Python3
213
214 HistCoord histShape;
215 std::copy(image.shape().begin(), image.shape().end(), histShape.begin());
216 histShape[DIM] = bins;
217 HistType histA(histShape);
218
219 histA = 0.0;
220
221 // collect values
222 HistCoord histCoord,nextHistCoord;
223 {
224 MultiCoordinateIterator<DIM> iter(image.shape());
225 for(std::ptrdiff_t i=0 ;i<image.size(); ++i, ++iter){
226 const ImgCoord imgCoord(*iter);
227 std::copy(imgCoord.begin(),imgCoord.end(),histCoord.begin() );
228
229 const T value = image[imgCoord];
230 const T fbinIndex = ((value-minVal)/(maxVal-minVal))*bins;
231 const T fFloorBin = std::floor(fbinIndex);
232 const int floorBin = static_cast<int>(fFloorBin);
233 const int ceilBin = static_cast<int>(std::ceil(fbinIndex));
234
235 if(floorBin==ceilBin){
236 histCoord[DIM] = floorBin;
237 histA[histCoord] += 1.0;
238 }
239 else{
240 const T floorBin = std::floor(fbinIndex);
241 const T ceilBin = std::ceil(fbinIndex);
242 const double ceilW = (fbinIndex - fFloorBin);
243 const double floorW = 1.0 - ceilW;
244 histCoord[DIM] = floorBin;
245 histA[histCoord] += floorW;
246 histCoord[DIM] = ceilBin;
247 histA[histCoord] += ceilW;
248 }
249
250 }
251 }
252 //
253 ConvolutionOptions<DIM+1> opts;
254 opts.stdDev(sigmas);
255
256 // convolve spatial dimensions
257 gaussianSmoothMultiArray(histA, histA, opts);
258
259 OutCoord outCoord;
260
261
262 std::vector<float> histBuffer(bins);
263 //std::cout<<"normalize and compute ranks\n";
264 {
265 MultiCoordinateIterator<DIM> iter(image.shape());
266 for(std::ptrdiff_t i=0 ;i<image.size(); ++i, ++iter){
267
268 // normalize
269 const ImgCoord imgCoord(*iter);
270 //std::cout<<"at pixel "<<imgCoord<<"\n";
271
272 std::copy(imgCoord.begin(),imgCoord.end(),histCoord.begin() );
273 nextHistCoord = histCoord;
274 std::copy(imgCoord.begin(),imgCoord.end(),outCoord.begin() );
275 double sum = 0;
276 for(size_t bi=0; bi<bins; ++bi){
277 histCoord[DIM] = bi;
278 sum += histA[histCoord];
279 }
280 for(size_t bi=0; bi<bins; ++bi){
281 histCoord[DIM] = bi;
282 histA[histCoord] /= sum;
283 }
284 histCoord[DIM] = 0;
285 histBuffer[0] = histA[histCoord];
286 for(size_t bi=1; bi<bins; ++bi){
287
288 double prevVal = histA[histCoord];
289 histCoord[DIM] = bi;
290 histA[histCoord] +=prevVal;
291 histBuffer[bi] = histA[histCoord];
292 }
293
294
295
296 size_t bi=0;
297 for(std::ptrdiff_t r=0; r<ranks.size(); ++r){
298 outCoord[DIM] = r;
299 const V rank = ranks[r];
300 histCoord[DIM] = bi;
301 nextHistCoord[DIM] = bi +1;
302 //std::cout<<" bi "<<bi<<" rank "<<rank<<" "<<histA[histCoord]<<"\n";
303 // corner cases
304 if(rank < histA[histCoord] ||
305 std::abs(rank-histA[histCoord])< 0.0000001 ||
306 bi==bins-1
307 ){
308 out[outCoord] = static_cast<U>((maxVal-minVal)*bi*bins + minVal);
309 break;
310 }
311 else{
312 // with binary search
313 const size_t upperBinIndex =
314 std::distance(histBuffer.begin(),std::lower_bound(histBuffer.begin()+bi, histBuffer.end(),float(rank)));
315 bi = upperBinIndex - 1;
316 histCoord[DIM] = bi;
317 nextHistCoord[DIM] = upperBinIndex;
318 const double rankVal0 = static_cast<U>((maxVal-minVal)*bi*bins + minVal);
319 const double rankVal1 = static_cast<U>((maxVal-minVal)*(bi+1)*bins + minVal);
320 const double dd = histA[nextHistCoord] - histA[histCoord];
321 const double relD0 = (rank - histA[histCoord])/dd;
322 out[outCoord] = rankVal1 * relD0 + (1.0 - relD0)*rankVal0;
323 break;
324 }
325 }
326 }
327 }
328 }
329 }
330 //end namespace vigra
331
332 #endif //VIGRA_MULTI_HISTOGRAMM_HXX
vigra::GridGraph
Define a grid graph in arbitrary dimensions.
Definition: multi_fwd.hxx:217
vigra::sum
NumericTraits< V >::Promote sum(TinyVectorBase< V, SIZE, D1, D2 > const &l)
sum of the vector's elements
Definition: tinyvector.hxx:2073
vigra::abs
FFTWComplex< R >::NormType abs(const FFTWComplex< R > &a)
absolute value (= magnitude)
Definition: fftw3.hxx:1002
vigra::convolveMultiArrayOneDimension
void convolveMultiArrayOneDimension(...)
Convolution along a single dimension of a multi-dimensional arrays.
vigra::gaussianSmoothMultiArray
void gaussianSmoothMultiArray(...)
Isotropic Gaussian smoothing of a multi-dimensional arrays.
vigra::ceil
int ceil(FixedPoint< IntBits, FracBits > v)
rounding up.
Definition: fixedpoint.hxx:675
vigra::floor
int floor(FixedPoint< IntBits, FracBits > v)
rounding down.
Definition: fixedpoint.hxx:667

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de) Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany | html generated using doxygen and Python vigra 1.11.0 (Thu Mar 17 2016)