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00028 #ifdef HAVE_CONFIG_H
00029 #include <config.h>
00030 #endif
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00044 #include <math.h>
00045 #include <assert.h>
00046 #include <cpl.h>
00047
00048 #include "irplib_slitpos.h"
00049 #include "irplib_flat.h"
00050
00051
00052
00053
00054
00055 #ifndef IRPLIB_SLITPOS_KERNEL_SIZE_Y
00056 #define IRPLIB_SLITPOS_KERNEL_SIZE_Y 5
00057 #endif
00058
00059 #ifndef IRPLIB_SLITPOS_MAX_EROSION
00060 #define IRPLIB_SLITPOS_MAX_EROSION 1024
00061 #endif
00062
00063
00064
00065
00066
00067 static cpl_error_code irplib_slitpos_find_edges_one_line(const cpl_image *,
00068 int, int *, int *);
00069 static cpl_error_code irplib_slitpos_find_vert_slit_ends(const cpl_image *,
00070 int, int *, int *);
00071 static cpl_error_code irplib_slitpos_find_vert_pos(const cpl_image *, int,
00072 int *);
00073
00074
00078
00079
00081
00107
00108 cpl_table * irplib_slitpos_analysis(const cpl_image * imslit,
00109 int slit_max_width,
00110 double * slit_flux)
00111 {
00112 const int slit_size = cpl_image_get_size_y(imslit);
00113 int slit_length;
00114 int slit_pos;
00115 cpl_image * filtered;
00116 cpl_matrix * kernel;
00117 cpl_image * thin_im;
00118 int slit_top_y = 0;
00119 int slit_bot_y = 0;
00120 cpl_table * self;
00121 double * slit_y,
00122 * slit_x_l,
00123 * slit_x_r;
00124 double * coeff_r;
00125 double * coeff_l;
00126 int i;
00127 cpl_error_code error = CPL_ERROR_NONE;
00128
00129
00130 if (slit_flux != NULL) *slit_flux = 0.0 ;
00131
00132
00133 kernel = cpl_matrix_new(3, 3);
00134 cpl_ensure(!cpl_matrix_fill(kernel, 1.0), cpl_error_get_code(), NULL);
00135
00136 filtered = cpl_image_filter_median(imslit, kernel);
00137 cpl_matrix_delete(kernel);
00138
00139 if (filtered == NULL) {
00140 cpl_msg_error(cpl_func, "Could not filter the image");
00141 cpl_ensure(0, cpl_error_get_code(), NULL);
00142 }
00143
00144
00145 if (irplib_slitpos_find_vert_pos(filtered, slit_max_width/2, &slit_pos)) {
00146 cpl_msg_error(cpl_func, "Could not find the slit position");
00147 cpl_ensure(0, cpl_error_get_code(), NULL);
00148 }
00149
00150
00151 if ((thin_im = cpl_image_extract(filtered,
00152 slit_pos-slit_max_width/2,
00153 1,
00154 slit_pos+slit_max_width/2,
00155 slit_size)) == NULL) {
00156 cpl_msg_error(cpl_func, "Could not extract the %d pixel thin image "
00157 "around position %d", slit_max_width, slit_pos);
00158 cpl_image_delete(filtered);
00159 cpl_ensure(0, cpl_error_get_code(), NULL);
00160 }
00161
00162
00163 if ((irplib_slitpos_find_vert_slit_ends(thin_im,
00164 IRPLIB_SLITPOS_KERNEL_SIZE_Y,
00165 &slit_bot_y,
00166 &slit_top_y))) {
00167 cpl_msg_error(cpl_func, "Could not find the ends of the slit at %s",
00168 cpl_error_get_where());
00169 cpl_image_delete(filtered);
00170 cpl_image_delete(thin_im);
00171 cpl_ensure(0, cpl_error_get_code(), NULL);
00172 }
00173 cpl_image_delete(thin_im);
00174
00175
00176 thin_im = cpl_image_extract(filtered,
00177 slit_pos-slit_max_width/2,
00178 slit_bot_y,
00179 slit_pos+slit_max_width/2,
00180 slit_top_y);
00181 cpl_image_delete(filtered);
00182
00183 if (thin_im == NULL) {
00184 cpl_msg_error(cpl_func, "Could not extract the thin image from %d to %d",
00185 slit_bot_y, slit_top_y);
00186 cpl_ensure(0, cpl_error_get_code(), NULL);
00187 }
00188
00189 slit_length = 1 + slit_top_y - slit_bot_y;
00190
00191
00192 slit_y = cpl_malloc(slit_length * sizeof(double));
00193 slit_x_l = cpl_malloc(slit_length * sizeof(double));
00194 slit_x_r = cpl_malloc(slit_length * sizeof(double));
00195
00196
00197 for (i=0 ; i<slit_length ; i++) {
00198 int right_pos = 0;
00199 int left_pos = 0;
00200
00201 if (irplib_slitpos_find_edges_one_line(thin_im,
00202 i,
00203 &left_pos,
00204 &right_pos)) {
00205 cpl_msg_error(cpl_func, "cannot find the edges of the [%d]th line",
00206 i+1);
00207 cpl_image_delete(thin_im);
00208 return NULL;
00209 }
00210
00211
00212 if (slit_flux != NULL) {
00213 *slit_flux += cpl_image_get_flux_window(thin_im, left_pos+1,
00214 i+1, right_pos+1, i+1) ;
00215 }
00216
00217
00218 slit_x_l[i] = (double)left_pos;
00219 slit_x_r[i] = (double)right_pos;
00220 slit_y[i] = (double)(i+slit_bot_y-1);
00221 }
00222 cpl_image_delete(thin_im);
00223
00224
00225 coeff_l = irplib_flat_fit_slope_robust(slit_y, slit_x_l, slit_length);
00226 coeff_r = irplib_flat_fit_slope_robust(slit_y, slit_x_r, slit_length);
00227 cpl_free(slit_y);
00228 cpl_free(slit_x_l);
00229 cpl_free(slit_x_r);
00230
00231
00232 self = cpl_table_new(slit_length);
00233 error |= cpl_table_new_column(self, "SLIT_Y", CPL_TYPE_INT);
00234 error |= cpl_table_new_column(self, "SLIT_LEFT", CPL_TYPE_DOUBLE);
00235 error |= cpl_table_new_column(self, "SLIT_CENTER", CPL_TYPE_DOUBLE);
00236 error |= cpl_table_new_column(self, "SLIT_RIGHT", CPL_TYPE_DOUBLE);
00237
00238 error |= cpl_table_set_column_unit(self, "SLIT_Y", "pixel");
00239 error |= cpl_table_set_column_unit(self, "SLIT_LEFT", "pixel");
00240 error |= cpl_table_set_column_unit(self, "SLIT_CENTER", "pixel");
00241 error |= cpl_table_set_column_unit(self, "SLIT_RIGHT", "pixel");
00242
00243 cpl_ensure(!error, cpl_error_get_code(), NULL);
00244
00245
00246 for (i=0 ; i < slit_length ; i++) {
00247 const int islity = i + slit_bot_y;
00248 const double dslit = slit_pos - slit_max_width / 2.0;
00249 const double dleft = coeff_l[0] + coeff_l[1] * (double)islity + dslit;
00250 const double dright = coeff_r[0] + coeff_r[1] * (double)islity + dslit;
00251 const double dcent = 0.5 * (dleft + dright);
00252
00253 if (cpl_table_set_int(self, "SLIT_Y", i, islity)) break;
00254 if (cpl_table_set_double(self, "SLIT_LEFT", i, dleft)) break;
00255 if (cpl_table_set_double(self, "SLIT_RIGHT", i, dright)) break;
00256 if (cpl_table_set_double(self, "SLIT_CENTER", i, dcent)) break;
00257 }
00258
00259 cpl_free(coeff_r);
00260 cpl_free(coeff_l);
00261
00262 if (i != slit_length) {
00263 cpl_table_delete(self);
00264 cpl_ensure(0, cpl_error_get_code(), NULL);
00265 }
00266
00267 return self;
00268 }
00269
00272
00284
00285 static cpl_error_code irplib_slitpos_find_edges_one_line(const cpl_image * self,
00286 int line_pos,
00287 int * left_pos,
00288 int * right_pos)
00289 {
00290 const int size_x = cpl_image_get_size_x(self);
00291 const float * pself;
00292 double threshold;
00293 int i;
00294
00295 cpl_ensure_code(self != NULL, CPL_ERROR_NULL_INPUT);
00296 cpl_ensure_code(cpl_image_get_type(self) == CPL_TYPE_FLOAT,
00297 CPL_ERROR_INVALID_TYPE);
00298
00299 pself = cpl_image_get_data_float(self);
00300
00301
00302 threshold = cpl_image_get_mean_window(self, 1, line_pos+1, size_x,
00303 line_pos+1);
00304
00305
00306 i = 0;
00307 while (i < size_x && pself[line_pos*size_x+i] < threshold) i++;
00308 *left_pos = i;
00309
00310
00311 i = size_x - 1;
00312 while (i >= 0 && pself[line_pos*size_x+i] < threshold) i--;
00313 *right_pos = i;
00314
00315 return CPL_ERROR_NONE;
00316 }
00317
00318
00329
00330 static cpl_error_code irplib_slitpos_find_vert_slit_ends(const cpl_image * self,
00331 int kernel_size,
00332 int * bot_slit_y,
00333 int * top_slit_y)
00334 {
00335 cpl_mask * binary;
00336 cpl_matrix * kernel;
00337 cpl_image * label_image;
00338 int nobj, erosions_nb;
00339 const int size_x = cpl_image_get_size_x(self);
00340 const int npix = size_x * cpl_image_get_size_y(self);
00341 const cpl_binary * pbinary;
00342 const cpl_binary * pfind;
00343 int i, itop, ibot;
00344
00345
00346 cpl_ensure_code(size_x > 0, cpl_error_get_code());
00347
00348
00349 binary = cpl_mask_threshold_image_create(self, cpl_image_get_mean(self),
00350 cpl_image_get_max(self));
00351 cpl_ensure_code(binary != NULL, cpl_error_get_code());
00352
00353
00354 kernel = cpl_matrix_new(kernel_size, 1);
00355
00356
00357 label_image = cpl_image_labelise_mask_create(binary, &nobj);
00358 cpl_image_delete(label_image);
00359
00360 if (label_image == NULL || kernel == NULL || cpl_matrix_fill(kernel, 1.0)) {
00361 cpl_mask_delete(binary);
00362 cpl_matrix_delete(kernel);
00363 cpl_ensure_code(0, cpl_error_get_code());
00364 }
00365
00366 for (erosions_nb = 0; erosions_nb < IRPLIB_SLITPOS_MAX_EROSION && nobj > 1;
00367 erosions_nb++) {
00368
00369
00370 if (cpl_mask_erosion(binary, kernel)) break;
00371
00372 label_image = cpl_image_labelise_mask_create(binary, &nobj);
00373 if (label_image == NULL) break;
00374 cpl_image_delete(label_image);
00375 }
00376
00377 if (nobj > 1) {
00378 cpl_mask_delete(binary);
00379 cpl_matrix_delete(kernel);
00380 if (erosions_nb >= IRPLIB_SLITPOS_MAX_EROSION) {
00381 cpl_msg_error(cpl_func, "Number of erosions reached a limit of %d "
00382 "with %d possible slits left",
00383 IRPLIB_SLITPOS_MAX_EROSION, nobj);
00384 cpl_ensure_code(0, CPL_ERROR_CONTINUE);
00385 }
00386 cpl_ensure_code(0, cpl_error_get_code());
00387 } else if (nobj < 1) {
00388 cpl_mask_delete(binary);
00389 cpl_matrix_delete(kernel);
00390 if (erosions_nb == 0)
00391 cpl_msg_error(cpl_func, "No slit could be detected across %d "
00392 "pixels", size_x);
00393 else
00394 cpl_msg_error(cpl_func, "The last of %d erosions removed all the "
00395 "possible slits", erosions_nb);
00396 cpl_ensure_code(0, CPL_ERROR_DATA_NOT_FOUND);
00397 }
00398
00399
00400 for (i=0 ; i < erosions_nb ; i++) {
00401 if (cpl_mask_dilation(binary, kernel)) break;
00402 }
00403 cpl_matrix_delete(kernel);
00404
00405 if (i != erosions_nb) {
00406 cpl_msg_error(cpl_func, "Dilation number %d out of %d failed",
00407 i, erosions_nb);
00408 cpl_mask_delete(binary);
00409 cpl_ensure_code(0, cpl_error_get_code());
00410 }
00411
00412
00413 pbinary = cpl_mask_get_data(binary);
00414 assert( pbinary != NULL );
00415
00416 pfind = memchr(pbinary, CPL_BINARY_1, (size_t)npix);
00417 assert( pfind != NULL );
00418
00419 ibot = (int)(pfind - pbinary);
00420
00421 #if defined HAVE_DECL_MEMRCHR && HAVE_DECL_MEMRCHR == 1
00422
00423 pfind = memrchr(pfind, CPL_BINARY_1, (size_t)(npix - ibot));
00424 assert( pfind != NULL );
00425
00426 itop = (int)(pfind - pbinary);
00427 #else
00428
00429 itop = npix - 1;
00430 while (itop > ibot && pbinary[itop] != CPL_BINARY_1) itop--;
00431
00432 #endif
00433
00434 *bot_slit_y = 1 + ibot / size_x;
00435 *top_slit_y = 1 + itop / size_x;
00436
00437 cpl_msg_info(cpl_func, "Detected %d-pixel slit from pixel %d to %d "
00438 "using %d erosions/dilations", cpl_mask_count(binary),
00439 *bot_slit_y, *top_slit_y, erosions_nb);
00440
00441 cpl_mask_delete(binary);
00442
00443
00444 cpl_ensure_code(ibot <= itop, CPL_ERROR_DATA_NOT_FOUND);
00445
00446 return CPL_ERROR_NONE;
00447 }
00448
00449
00459
00460 static cpl_error_code irplib_slitpos_find_vert_pos(const cpl_image * self,
00461 int xwidth,
00462 int * slit_pos)
00463 {
00464 const int size_x = cpl_image_get_size_x(self);
00465 cpl_image * image1D;
00466 int yone;
00467 cpl_error_code error;
00468
00469
00470
00471 image1D = cpl_image_collapse_create(self, 0);
00472
00473 cpl_ensure_code(image1D != NULL, cpl_error_get_code());
00474
00475
00476 error = cpl_image_get_maxpos_window(image1D, 1+xwidth, 1, size_x-xwidth,
00477 1, slit_pos, &yone);
00478
00479 cpl_image_delete(image1D);
00480
00481 cpl_ensure_code(!error, error);
00482
00483 return CPL_ERROR_NONE;
00484 }