1IM_CORREL(3)               Library Functions Manual               IM_CORREL(3)
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NAME

6       im_correl - search for image match
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SYNOPSIS

9       #include <vips/vips.h>
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11       int
12       im_correl( IMAGE *ref, IMAGE *sec,
13         int xref, int yref, int xsec, int ysec,
14         int hwindowsize, int hsearchsize,
15         double *correlation, int *x, int *y )
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DESCRIPTION

19       im_correl()  is the base image-searching function used by the mosaicing
20       functions im_lrmosaic() and im_tbmosaic(), and by the matching funtions
21       im_match_linear() and im_match_linear_search().
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23       It  finds  the  position  of  the  secondary  image sec within ref.  It
24       searches the area around xsec , ysec for the best match  for  the  area
25       around  xref  ,  yref.   It  searches an area of size hsearchsize for a
26       match of size hwindowsize.  The position of the best match is returned,
27       together with the correlation at that point.
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29       Only  the  first  band  of each image is correlated. ref and sec may be
30       very large --- the function  extracts  and  generated  just  the  parts
31       needed.  Correlation is done with im_spcor(); the position of the maxi‐
32       mum is found with im_maxpos().
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SEE ALSO

35       im_fastcor(3), im_spcor(3), im_maxpos(3), im_match_linear(3),  im_lrmo‐
36       saic(3).
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AUTHOR

39       J.Cupitt - 22/02/93
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42       The National Gallery and Birkbeck College, 1989-1996.
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46                                  13 May 1991                     IM_CORREL(3)
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