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imagery
Glynn Clements 08a91ed99f Don't use // comments (C89 compatibility) 12 jaren geleden
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Makefile 0f46a5c405 imagerylib: include VECT_INC 13 jaren geleden
README db49180dd7 welcome to GRASS 7.0.svn 17 jaren geleden
alloc.c 8868d4b686 indent -bad -bap -bbb -br -bli0 -bls -cli0 -ncs -fc1 -hnl -i4 \ 17 jaren geleden
eol.c 8868d4b686 indent -bad -bap -bbb -br -bli0 -bls -cli0 -ncs -fc1 -hnl -i4 \ 17 jaren geleden
find.c 8868d4b686 indent -bad -bap -bbb -br -bli0 -bls -cli0 -ncs -fc1 -hnl -i4 \ 17 jaren geleden
fopen.c 98dbc68757 fixed unlucky formatted messages (thanks to Glynn) 17 jaren geleden
georef.c 5ae5d66d61 move polynomial transformation to imagery lib 13 jaren geleden
group.c a927cf1428 use G_getl2(), i18n (merge from devbr6) 16 jaren geleden
iclass.c 7d87dd0188 imagerylib: fix I_iclass_init_group() to read raster maps from subgroup (patch provided by Anna Kratochvilova) 12 jaren geleden
iclass_bands.c e1d5fc9103 imagerylib: functions used by wxIClass, based on i.class (co-author V. Petras) 13 jaren geleden
iclass_local_proto.h 08a91ed99f Don't use // comments (C89 compatibility) 12 jaren geleden
iclass_perimeter.c 08a91ed99f Don't use // comments (C89 compatibility) 12 jaren geleden
iclass_signatures.c 08a91ed99f Don't use // comments (C89 compatibility) 12 jaren geleden
iclass_statistics.c 7d87dd0188 imagerylib: fix I_iclass_init_group() to read raster maps from subgroup (patch provided by Anna Kratochvilova) 12 jaren geleden
imagerylib.dox bd5fd6b638 doxygen updated 16 jaren geleden
list_gp.c a4f35de12d imagerylib: i18n, message cosmetics 16 jaren geleden
list_subgp.c a4f35de12d imagerylib: i18n, message cosmetics 16 jaren geleden
loc_info.c 3a539ed71b Fix: return the allocated buffer 15 jaren geleden
points.c a927cf1428 use G_getl2(), i18n (merge from devbr6) 16 jaren geleden
ref.c 8868d4b686 indent -bad -bap -bbb -br -bli0 -bls -cli0 -ncs -fc1 -hnl -i4 \ 17 jaren geleden
sig.c 8868d4b686 indent -bad -bap -bbb -br -bli0 -bls -cli0 -ncs -fc1 -hnl -i4 \ 17 jaren geleden
sigfile.c 79ea9c0b06 imagerylib: update signature functions to use G_unqualified_name() 12 jaren geleden
sigset.c 8868d4b686 indent -bad -bap -bbb -br -bli0 -bls -cli0 -ncs -fc1 -hnl -i4 \ 17 jaren geleden
sigsetfile.c 79ea9c0b06 imagerylib: update signature functions to use G_unqualified_name() 12 jaren geleden
target.c 8868d4b686 indent -bad -bap -bbb -br -bli0 -bls -cli0 -ncs -fc1 -hnl -i4 \ 17 jaren geleden
title.c a927cf1428 use G_getl2(), i18n (merge from devbr6) 16 jaren geleden
var.c 8868d4b686 indent -bad -bap -bbb -br -bli0 -bls -cli0 -ncs -fc1 -hnl -i4 \ 17 jaren geleden

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)