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Input Cards

FC_METHOD $\textstyle \parbox{0.75\linewidth}{
{\textrm{\it{{\underline{magfft}} \ensuremath{\:\vert\:}magspace \ensuremath{\:\vert\:}oversample}}}}$
$\textstyle \parbox{\MY}{Select method for the computation. Compute cross-correl...
...tically, avoids
aliasing of spectrum when magnitude is computed (using FFTs).}$

FC_NWIN $\textstyle \parbox{0.75\linewidth}{
$\textstyle \parbox{\MY}{The number of windows to be distributed over the total image. if
points are read from file (FC\_IN\_POS), then this card is ignored.}$

FC_IN_POS $\textstyle \parbox{0.75\linewidth}{
$\textstyle \parbox{\MY}{A ascii file with (integer line pixel pairs) coordinate...
...). The coordinates
should be within the current overlap of master and slave. }$

FC_WINSIZE $\textstyle \parbox{0.75\linewidth}{
{\textrm{\it{{\underline{32 32}}}}}}$
$\textstyle \parbox{\MY}{The size of the correlation window. Recommended is 64 64}$

FC_ACC $\textstyle \parbox{0.75\linewidth}{
{\textrm{\it{{\underline{4 4}}}}}}$
$\textstyle \parbox{\MY}{The search accuracy for the maximum correlation. Advice...
then one should select a bigger window and a larger search

FC_INITOFF $\textstyle \parbox{0.75\linewidth}{
{\textrm{\it{{\underline{0 0}} \ensuremath{\:\vert\:}COARSECORR}}}}$
$\textstyle \parbox{\MY}{The initial offset between master and slave. ''COARSECORR'' indicates
that the results of the step {\bf COARSECORR} are used.}$

FC_OSFACTOR $\textstyle \parbox{0.75\linewidth}{
$\textstyle \parbox{\MY}{The oversampling factor for the harmonic interpolation ...
...ation. Recommended is 32 to co-register the images within a
tenth of a pixel.}$

FC_PLOT $\textstyle \parbox{0.75\linewidth}{
{\textrm{\it{threshold=0.4 NOBG \ensuremath{\:\vert\:}BG}}}}$
$\textstyle \parbox{\MY}{Call gmt script plotoffset to plot results and to view ...
... can be given from the prompt as well, for different values of the

With a command like:

 awk 'BEGIN{for (i=100;i<25200;i=i+500) \ 
 {for (j=750;j<5400;j=j+200) \ 
 {printf "%i %i \n",i,j}} exit}'

the file for FC_IN_POS can be easily generated for a grid of locations.

Example input cards for this step:

 FC_METHOD       oversample       //
  c FC_METHOD       magfft        //
  c FC_METHOD     magspace        //
 FC_NWIN         101              // number of windows
 FC_WINSIZE      64 64            // size of windows
 FC_ACC          8 8              // search window, 2^n
 FC_INITOFF      coarsecorr       // use result of coarse to compute first
 FC_OSFACTOR     32               // oversampling factor

Leijen 2009-04-14