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include "iralign.h"
# IR_LINKS -- Procedure to compute the shifts for each subraster.
int procedure ir_links (cl, xrshift, yrshift, xcshift, ycshift, nrshift,
ncshift, ncols, nrows, nxrsub, nyrsub, nxsub, nysub, nxoverlap,
nyoverlap, order)
int cl # coordinate list descriptor
real xrshift[nxsub,ARB] # x row shifts
real yrshift[nxsub,ARB] # y row shifts
real xcshift[nxsub,ARB] # x column shifts
real ycshift[nxsub,ARB] # y column shifts
int nrshift[nxsub,ARB] # number of row shifts
int ncshift[nxsub,ARB] # number of column shifts
int ncols # number of columns per subraster
int nrows # number of rows per subraster
int nxrsub # column index of reference subraster
int nyrsub # row index of reference subraster
int nxsub # number of subrasters in x
int nysub # number of subrasters in y
int nxoverlap # number of columns of overlap
int nyoverlap # number of rows of overlap
int order # row or column order
int i, j, nxsize, nysize, ilimit, olimit, nshifts
pointer sp, xcolavg, ycolavg, xrowavg, yrowavg, nrowavg, ncolavg
real isign, jsign, xrmed, yrmed, xcmed, ycmed
int ir_decode_shifts()
real irmedr()
begin
# Allocate temporary space.
if (order == IR_COLUMN) {
ilimit = nysub
olimit = nxsub
} else {
ilimit = nxsub
olimit = nysub
}
# Clear the shift arrays.
call aclrr (xrshift, nxsub * nysub)
call aclrr (yrshift, nxsub * nysub)
call aclrr (xcshift, nxsub * nysub)
call aclrr (ycshift, nxsub * nysub)
call aclri (nrshift, nxsub * nysub)
call aclri (ncshift, nxsub * nysub)
# Accumulate the shifts.
nxsize = ncols - nxoverlap
nysize = nrows - nyoverlap
nshifts = ir_decode_shifts (cl, xrshift, yrshift, nrshift, xcshift,
ycshift, ncshift, nxsub, nysub, nxrsub, nyrsub, nxoverlap,
nyoverlap, nxsize, nysize)
if (nshifts == 0)
return (0)
# Allocate working space.
call smark (sp)
call salloc (xcolavg, olimit, TY_REAL)
call salloc (ycolavg, olimit, TY_REAL)
call salloc (ncolavg, olimit, TY_INT)
call salloc (xrowavg, olimit, TY_REAL)
call salloc (yrowavg, olimit, TY_REAL)
call salloc (nrowavg, olimit, TY_INT)
# Clear the accumulator arrays.
call aclrr (Memr[xcolavg], olimit)
call aclrr (Memr[ycolavg], olimit)
call aclri (Memi[ncolavg], olimit)
call aclrr (Memr[xrowavg], olimit)
call aclrr (Memr[yrowavg], olimit)
call aclri (Memi[nrowavg], olimit)
# Compute the row or column sums.
if (order == IR_COLUMN) {
do i = 1, nxsub {
do j = 1, nysub {
if (nrshift[i,j] > 0) {
Memr[xrowavg+i-1] = Memr[xrowavg+i-1] +
abs (xrshift[i,j])
Memr[yrowavg+i-1] = Memr[yrowavg+i-1] +
abs (yrshift[i,j])
Memi[nrowavg+i-1] = Memi[nrowavg+i-1] + 1
}
if (ncshift[i,j] > 0) {
Memr[xcolavg+i-1] = Memr[xcolavg+i-1] +
abs (xcshift[i,j])
Memr[ycolavg+i-1] = Memr[ycolavg+i-1] +
abs (ycshift[i,j])
Memi[ncolavg+i-1] = Memi[ncolavg+i-1] + 1
}
}
}
} else {
do i = 1, nysub {
do j = 1, nxsub {
if (nrshift[j,i] > 0) {
Memr[xrowavg+i-1] = Memr[xrowavg+i-1] +
abs (xrshift[j,i])
Memr[yrowavg+i-1] = Memr[yrowavg+i-1] +
abs (yrshift[j,i])
Memi[nrowavg+i-1] = Memi[nrowavg+i-1] + 1
}
if (ncshift[j,i] > 0) {
Memr[xcolavg+i-1] = Memr[xcolavg+i-1] +
abs (xcshift[j,i])
Memr[ycolavg+i-1] = Memr[ycolavg+i-1] +
abs (ycshift[j,i])
Memi[ncolavg+i-1] = Memi[ncolavg+i-1] + 1
}
}
}
}
# Compute the averages.
do i = 1, olimit {
if (Memi[nrowavg+i-1] > 0) {
Memr[xrowavg+i-1] = Memr[xrowavg+i-1] / Memi[nrowavg+i-1]
Memr[yrowavg+i-1] = Memr[yrowavg+i-1] / Memi[nrowavg+i-1]
}
if (Memi[ncolavg+i-1] > 0) {
Memr[xcolavg+i-1] = Memr[xcolavg+i-1] / Memi[ncolavg+i-1]
Memr[ycolavg+i-1] = Memr[ycolavg+i-1] / Memi[ncolavg+i-1]
}
}
# Compute the medians of the row and column averages.
xrmed = irmedr (Memr[xrowavg], Memi[nrowavg], olimit)
yrmed = irmedr (Memr[yrowavg], Memi[nrowavg], olimit)
xcmed = irmedr (Memr[xcolavg], Memi[ncolavg], olimit)
ycmed = irmedr (Memr[ycolavg], Memi[ncolavg], olimit)
# Use the average shifts for subrasters with no information.
do j = 1, nysub {
if (j == nyrsub)
jsign = 0.0
else if (j < nyrsub)
jsign = 1.0
else
jsign = -1.0
do i = 1, nxsub {
if (i == nxrsub)
isign = 0.0
else if (i < nxrsub)
isign = 1.0
else
isign = -1.0
if (nrshift[i,j] <= 0) {
if (Memi[nrowavg+i-1] <= 0) {
xrshift[i,j] = isign * xrmed
yrshift[i,j] = jsign * yrmed
} else if (order == IR_COLUMN) {
xrshift[i,j] = isign * Memr[xrowavg+i-1]
yrshift[i,j] = jsign * Memr[yrowavg+i-1]
} else {
xrshift[i,j] = isign * Memr[xrowavg+j-1]
yrshift[i,j] = jsign * Memr[yrowavg+j-1]
}
}
if (ncshift[i,j] <= 0) {
if (Memi[ncolavg+i-1] <= 0) {
xcshift[i,j] = isign * xcmed
ycshift[i,j] = jsign * ycmed
} else if (order == IR_COLUMN) {
xcshift[i,j] = isign * Memr[xcolavg+i-1]
ycshift[i,j] = jsign * Memr[ycolavg+i-1]
} else {
xcshift[i,j] = isign * Memr[xcolavg+j-1]
ycshift[i,j] = jsign * Memr[ycolavg+j-1]
}
}
}
}
call sfree (sp)
return (nshifts)
end
# IR_DECODE_SHIFTS -- Procedure to accumulate shifts for each subraster.
int procedure ir_decode_shifts (cl, xrshift, yrshift, nrshift, xcshift,
ycshift, ncshift, nxsub, nysub, nxrsub, nyrsub, nxoverlap,
nyoverlap, nxsize, nysize)
int cl # coordinate list descriptor
real xrshift[nxsub,ARB] # x row shifts
real yrshift[nxsub,ARB] # y row shifts
int nrshift[nxsub,ARB] # number of row shifts
real xcshift[nxsub,ARB] # x column shifts
real ycshift[nxsub,ARB] # y column shifts
int ncshift[nxsub,ARB] # number of column shifts
int nxsub # number of subrasters in x
int nysub # number of subrasters in y
int nxrsub # column index of reference subraster
int nyrsub # row index of reference subraster
int nxoverlap # number of columns of overlap
int nyoverlap # number of rows of overlap
int nxsize # size of unoverlapped region
int nysize # size of unoverlapped region
int i, j, nx1, ny1, nx2, ny2, r21, r22, stat, nshifts
real x1, y1, x2, y2, xdif, xdifm, ydif, ydifm
int fscan(), nscan()
begin
nshifts = 0
while (fscan (cl) != EOF) {
# Get the first coordinate pair.
call gargr (x1)
call gargr (y1)
if (nscan () != 2)
next
# Compute which subraster 1 belongs to.
if (mod (int (x1), nxsize) == 0)
nx1 = int (x1) / nxsize
else
nx1 = int (x1) / nxsize + 1
if (mod (int (y1), nysize) == 0)
ny1 = int (y1) / nysize
else
ny1 = int (y1) / nysize + 1
# Get the second coordinate pair.
repeat {
stat = fscan (cl)
if (stat == EOF)
break
call gargr (x2)
call gargr (y2)
# Compute which subraster 2 belongs to.
if (nscan () == 2) {
if (mod (int (x2), nxsize) == 0)
nx2 = int (x2) / nxsize
else
nx2 = int (x2) / nxsize + 1
if (mod (int (y2), nysize) == 0)
ny2 = int (y2) / nysize
else
ny2 = int (y2) / nysize + 1
}
} until (nscan () == 2)
if (stat == EOF || nscan() != 2)
break
r21 = (nx1 - nxrsub) ** 2 + (ny1 - nyrsub) ** 2
r22 = (nx2 - nxrsub) ** 2 + (ny2 - nyrsub) ** 2
# Illegal shift
if (r21 == r22)
next
# Compute the shift for the first subraster.
else if (r21 > r22) {
xdif = x2 - x1
if (nxoverlap < 0) {
if (xdif < 0.0)
xdifm = xdif - nxoverlap
else if (xdif > 0.0)
xdifm = xdif + nxoverlap
} else
xdifm = xdif
ydif = y2 - y1
if (nyoverlap < 0) {
if (ydif < 0.0)
ydifm = ydif - nyoverlap
else if (ydif > 0.0)
ydifm = ydif + nyoverlap
} else
ydifm = ydif
if (nx1 == nx2) {
xcshift[nx1,ny1] = xcshift[nx1,ny1] + xdif
ycshift[nx1,ny1] = ycshift[nx1,ny1] + ydifm
ncshift[nx1,ny1] = ncshift[nx1,ny1] + 1
} else if (ny1 == ny2) {
xrshift[nx1,ny1] = xrshift[nx1,ny1] + xdifm
yrshift[nx1,ny1] = yrshift[nx1,ny1] + ydif
nrshift[nx1,ny1] = nrshift[nx1,ny1] + 1
} else
next
# Compute the shift for the second subraster.
} else {
xdif = x1 - x2
if (nxoverlap < 0) {
if (xdif < 0.0)
xdifm = xdif - nxoverlap
else if (xdif > 0.0)
xdifm = xdif + nxoverlap
} else
xdifm = xdif
ydif = y1 - y2
if (nyoverlap < 0) {
if (ydif < 0.0)
ydifm = ydif - nyoverlap
else if (ydif > 0.0)
ydifm = ydif + nyoverlap
} else
ydifm = ydif
if (nx1 == nx2) {
xcshift[nx2,ny2] = xcshift[nx2,ny2] + xdif
ycshift[nx2,ny2] = ycshift[nx2,ny2] + ydifm
ncshift[nx2,ny2] = ncshift[nx2,ny2] + 1
} else if (ny1 == ny2) {
xrshift[nx2,ny2] = xrshift[nx2,ny2] + xdifm
yrshift[nx2,ny2] = yrshift[nx2,ny2] + ydif
nrshift[nx2,ny2] = nrshift[nx2,ny2] + 1
} else
next
}
nshifts = nshifts + 1
}
# Compute the final shifts.
do j = 1, nysub {
do i = 1, nxsub {
if (nrshift[i,j] > 0) {
xrshift[i,j] = xrshift[i,j] / nrshift[i,j]
yrshift[i,j] = yrshift[i,j] / nrshift[i,j]
}
if (ncshift[i,j] > 0) {
xcshift[i,j] = xcshift[i,j] / ncshift[i,j]
ycshift[i,j] = ycshift[i,j] / ncshift[i,j]
}
}
}
return (nshifts)
end
# IR_CLINKS -- Procedure to compute the shifts for each subraster.
int procedure ir_clinks (xrshift, yrshift, xcshift, ycshift, nxrsub, nyrsub,
nxsub, nysub, xshift, yshift)
real xrshift[nxsub,ARB] # x row shifts
real yrshift[nxsub,ARB] # y row shifts
real xcshift[nxsub,ARB] # x column shifts
real ycshift[nxsub,ARB] # y column shifts
int nxrsub # x index of reference subraster
int nyrsub # y index of reference subraster
int nxsub # number of subrasters in x direction
int nysub # number of subrasters in y direction
real xshift # xshift of the coordinates
real yshift # yshift of the coordinates
int i, j, isign, jsign
begin
do j = 1, nysub {
if (j == nyrsub)
jsign = 0
else if (j < nyrsub)
jsign = 1
else
jsign = -1
do i = 1, nxsub {
if (i == nxrsub)
isign = 0
else if (i < nxrsub)
isign = 1
else
isign = -1
xrshift[i,j] = isign * abs (xshift)
yrshift[i,j] = 0.0
xcshift[i,j] = 0.0
ycshift[i,j] = jsign * abs (yshift)
}
}
return (1)
end
# IR_FLINKS -- Routine to fetch the shifts directly
int procedure ir_flinks (cl, deltax, deltay, deltai, max_nshifts)
int cl # shifts file descriptor
real deltax[ARB] # x shifts
real deltay[ARB] # y shifts
real deltai[ARB] # intensity shifts
int max_nshifts # maximum number of shifts
int nshifts
int fscan(), nscan()
begin
nshifts = 0
while ((fscan (cl) != EOF) && (nshifts < max_nshifts)) {
call gargr (deltax[nshifts+1])
call gargr (deltay[nshifts+1])
call gargr (deltai[nshifts+1])
if (nscan() < 2)
next
if (nscan() < 3)
deltai[nshifts+1] = 0.0
nshifts = nshifts + 1
}
return (nshifts)
end
# IR_MKSHIFT -- Routine to compute the total shift for each subraster.
procedure ir_mkshift (xrshift, yrshift, xcshift, ycshift, nxsub, nysub,
xsubindex, ysubindex, nxrsub, nyrsub, order, deltax, deltay)
real xrshift[nxsub,ARB] # x row shifts
real yrshift[nxsub,ARB] # y row shifts
real xcshift[nxsub,ARB] # x column shifts
real ycshift[nxsub,ARB] # y column shifts
int nxsub # number of subrasters in x direction
int nysub # number of subrasters in y direction
int xsubindex # x index of the subraster
int ysubindex # y index of the subraster
int nxrsub # x index of reference subraster
int nyrsub # y index of reference subraster
int order # row or column order
real deltax # total x shift
real deltay # total y shift
int j
begin
deltax = 0.0
deltay = 0.0
if (order == IR_COLUMN) {
if (ysubindex < nyrsub)
do j = ysubindex, nyrsub - 1 {
deltax = deltax + xcshift[xsubindex,j]
deltay = deltay + ycshift[xsubindex,j]
}
else if (ysubindex > nyrsub)
do j = nyrsub + 1, ysubindex {
deltax = deltax + xcshift[xsubindex,j]
deltay = deltay + ycshift[xsubindex,j]
}
if (xsubindex < nxrsub)
do j = xsubindex, nxrsub - 1 {
deltax = deltax + xrshift[j,nyrsub]
deltay = deltay + yrshift[j,nyrsub]
}
else if (xsubindex > nxrsub)
do j = nxrsub + 1, xsubindex {
deltax = deltax + xrshift[j,nyrsub]
deltay = deltay + yrshift[j,nyrsub]
}
} else {
if (xsubindex < nxrsub)
do j = xsubindex, nxrsub - 1{
deltax = deltax + xrshift[j,ysubindex]
deltay = deltay + yrshift[j,ysubindex]
}
else if (xsubindex > nxrsub)
do j = nxrsub + 1, xsubindex {
deltax = deltax + xrshift[j,ysubindex]
deltay = deltay + yrshift[j,ysubindex]
}
if (ysubindex < nyrsub)
do j = ysubindex, nyrsub - 1 {
deltax = deltax + xcshift[nxrsub,j]
deltay = deltay + ycshift[nxrsub,j]
}
else if (ysubindex > nyrsub)
do j = nyrsub + 1, ysubindex {
deltax = deltax + xcshift[nxrsub,j]
deltay = deltay + ycshift[nxrsub,j]
}
}
end
|
