| void Impala::Core::Array::extractRegions | ( | pixgroup * | rg, | |
| int | nrClusters, | |||
| const VectorDouble & | clusterMap, | |||
| const MatrixDouble & | m | |||
| ) |
Definition at line 235 of file ColorSegmentation.h.
References Impala::Core::Array::pixgroup::cov, Impala::Core::Matrix::MatrixTem< C >::covariance(), Impala::Core::Array::pixgroup::dim, Impala::Core::Matrix::MatrixTem< C >::getRow(), Impala::Core::Array::pixgroup::idx, Impala::Core::Array::pixgroup::m, Impala::Core::Matrix::MatrixTem< C >::nCol(), Impala::Core::Matrix::MatrixTem< C >::nRow(), Impala::Core::Array::pixgroup::nrPixInGroup, and Impala::Core::Matrix::MatrixTem< C >::setRow().
Referenced by ColorSegmentation().
00235 { 00236 00237 int nrPixInImage = m.nRow() ; 00238 int i; 00239 00240 // init 00241 for (i=0; i<nrClusters; i++) { 00242 00243 rg[i].size = nrPixInImage ; 00244 00245 // number of pixels in the group 00246 rg[i].nrPixInGroup = 0; 00247 00248 // for each pixel in the group, 00249 // keep a reference to its place in the original image 00250 rg[i].idx = VectorDouble(nrPixInImage); 00251 00252 rg[i].dim = m.nCol(); 00253 00254 } 00255 00256 // get regions for each pixel in the image 00257 for (i=0; i<nrPixInImage; i++) { 00258 // get the cluster number for pixel i 00259 int l = clusterMap[i]; 00260 // add a reference to the pixel i 00261 int n = rg[l].nrPixInGroup ; 00262 rg[l].idx[n] = i; //add pixel's index 00263 // added pixel i to group l 00264 rg[l].nrPixInGroup++; 00265 } 00266 00267 // set covariance and mean values for each region 00268 for (i=0; i<nrClusters; i++) { 00269 rg[i].label = i; 00270 00271 MatrixDouble rgPixMatrix(rg[i].nrPixInGroup, m.nCol(), 0.0) ; 00272 // create a new matrix of the pixels in group i 00273 for(int j=0;j<rg[i].nrPixInGroup;j++) 00274 rgPixMatrix.setRow(j, m.getRow(rg[i].idx[j]) ) ; 00275 00276 // set covariance matrix, and mean vector 00277 VectorDouble means ; 00278 rg[i].cov = rgPixMatrix.covariance(means) ; 00279 00280 rg[i].m = means ; 00281 } 00282 }
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