Martin Landa 5e8d12b3e5 add missing header when compiled without GDAL and PostgreSQL support hace 11 años
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Makefile 0f46a5c405 imagerylib: include VECT_INC hace 13 años
README db49180dd7 welcome to GRASS 7.0.svn hace 17 años
alloc.c 8868d4b686 indent -bad -bap -bbb -br -bli0 -bls -cli0 -ncs -fc1 -hnl -i4 \ hace 17 años
eol.c 8868d4b686 indent -bad -bap -bbb -br -bli0 -bls -cli0 -ncs -fc1 -hnl -i4 \ hace 17 años
find.c 8868d4b686 indent -bad -bap -bbb -br -bli0 -bls -cli0 -ncs -fc1 -hnl -i4 \ hace 17 años
fopen.c 98dbc68757 fixed unlucky formatted messages (thanks to Glynn) hace 17 años
georef.c 5ae5d66d61 move polynomial transformation to imagery lib hace 13 años
georef_tps.c df20bea26c imagery lib: add thin plate spline coordinate transformation hace 12 años
group.c a927cf1428 use G_getl2(), i18n (merge from devbr6) hace 16 años
iclass.c 6214629352 iclass backend: make subgroup optional hace 12 años
iclass_bands.c e1d5fc9103 imagerylib: functions used by wxIClass, based on i.class (co-author V. Petras) hace 13 años
iclass_local_proto.h 08a91ed99f Don't use // comments (C89 compatibility) hace 12 años
iclass_perimeter.c 08a91ed99f Don't use // comments (C89 compatibility) hace 12 años
iclass_signatures.c 08a91ed99f Don't use // comments (C89 compatibility) hace 12 años
iclass_statistics.c a6c86f7b56 imagerylib: avoid the compiler warning (discards 'const' qualifier) by explicit const cast hace 12 años
imagerylib.dox bd5fd6b638 doxygen updated hace 16 años
iscatt_core.c 5e8d12b3e5 add missing header when compiled without GDAL and PostgreSQL support hace 11 años
iscatt_structs.c 5a8bbb7db8 wx.iscatt: c backend hace 12 años
list_gp.c a4f35de12d imagerylib: i18n, message cosmetics hace 16 años
list_subgp.c 717583d7bf list subgroup: wrong pointer type fix hace 12 años
loc_info.c 3a539ed71b Fix: return the allocated buffer hace 15 años
points.c a927cf1428 use G_getl2(), i18n (merge from devbr6) hace 16 años
ref.c 8868d4b686 indent -bad -bap -bbb -br -bli0 -bls -cli0 -ncs -fc1 -hnl -i4 \ hace 17 años
sig.c 8868d4b686 indent -bad -bap -bbb -br -bli0 -bls -cli0 -ncs -fc1 -hnl -i4 \ hace 17 años
sigfile.c 79ea9c0b06 imagerylib: update signature functions to use G_unqualified_name() hace 12 años
sigset.c 8868d4b686 indent -bad -bap -bbb -br -bli0 -bls -cli0 -ncs -fc1 -hnl -i4 \ hace 17 años
sigsetfile.c 79ea9c0b06 imagerylib: update signature functions to use G_unqualified_name() hace 12 años
target.c 8868d4b686 indent -bad -bap -bbb -br -bli0 -bls -cli0 -ncs -fc1 -hnl -i4 \ hace 17 años
title.c a927cf1428 use G_getl2(), i18n (merge from devbr6) hace 16 años
var.c 8868d4b686 indent -bad -bap -bbb -br -bli0 -bls -cli0 -ncs -fc1 -hnl -i4 \ hace 17 años

README

To merge 2 signatures

n1 number of points in sig 1
n2 number of points in sig 2

mean1[nbands] means per band for sig 1
mean2[nbands] means per band for sig 2

var1[b1][b2] covariance band 1 with band 2 for sig 1
var2[b1][b2] covariance band 1 with band 2 for sig 2

the meger is

n = n1+n2
mean[b] = (mean1[b]*n1 + mean2[b]*n2)/n

sum1 = var1[b1][b2] * (n1-1) + n1 * mean[b1] * mean[b2];
sum2 = var2[b1][b2] * (n2-1) + n2 * mean[b1] * mean[b2];

var[b1][b2] = (sum1+sum2 - n*mean[b1]*mean[b2) / (n-1)