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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <imhdr.h>
include <imset.h>
include <mach.h>
include <math/gsurfit.h>
include <math/iminterp.h>
include "geotran.h"
# GEO_IMTRAN -- Correct an entire image for geometric distortion using the
# transformed coordinates and image interpolation.
procedure geo_imtran (input, output, geo, sx1, sy1, sx2, sy2)
pointer input #I pointer to input image
pointer output #I pointer to output image
pointer geo #I pointer to geotran structure
pointer sx1, sy1 #I pointers to linear surface descriptors
pointer sx2, sy2 #I pointer to higher order surface descriptors
int nincr
pointer sp, xref, yref, msi
real shift
real gsgetr()
begin
# Initialize the interpolant and compute the out-of-bounds pixel
# margin required.
if (IM_NDIM(input) == 1) {
call asitype (GT_INTERPSTR(geo), GT_INTERPOLANT(geo),
GT_NSINC(geo), nincr, shift)
call asisinit (msi, GT_INTERPOLANT(geo), GT_NSINC(geo),
nincr, shift, 0.0)
} else {
call msitype (GT_INTERPSTR(geo), GT_INTERPOLANT(geo),
GT_NSINC(geo), nincr, shift)
call msisinit (msi, GT_INTERPOLANT(geo), GT_NSINC(geo),
nincr, nincr, shift, shift, 0.0)
}
call geo_margset (sx1, sy1, sx2, sy2, GT_XMIN(geo), GT_XMAX(geo),
GT_NCOLS(geo), GT_YMIN(geo), GT_YMAX(geo), GT_NLINES(geo),
GT_INTERPOLANT(geo), GT_NSINC(geo), GT_NXYMARGIN(geo))
# Allocate working space.
call smark (sp)
call salloc (xref, GT_NCOLS(geo), TY_REAL)
call salloc (yref, GT_NLINES(geo), TY_REAL)
# Calculate the reference coordinates of the input image pixels.
call geo_ref (geo, Memr[xref], 1, GT_NCOLS(geo), GT_NCOLS(geo),
Memr[yref], 1, GT_NLINES(geo), GT_NLINES(geo), gsgetr (sx1,
GSXMIN), gsgetr (sx1, GSXMAX), gsgetr (sx1, GSYMIN), gsgetr (sx1,
GSYMAX), GT_ONE)
# Configure the out-of-bounds pixel references for the input image.
call geo_imset (input, geo, sx1, sy1, sx2, sy2, Memr[xref],
GT_NCOLS(geo), Memr[yref], GT_NLINES(geo))
# Interpolate.
call geo_gsvector (input, output, geo, msi, Memr[xref], 1,
GT_NCOLS(geo), Memr[yref], 1, GT_NLINES(geo), sx1, sy1, sx2, sy2)
# Clean up.
if (IM_NDIM(input) == 1)
call asifree (msi)
else
call msifree (msi)
call sfree (sp)
end
# GEO_SIMTRAN -- Correct an entire image for geometric distortion using
# nterpolated coordinate surfaces to speed up computation of the transformed
# coordinates and image interpolation.
procedure geo_simtran (input, output, geo, sx1, sy1, sx2, sy2)
pointer input #I pointer to input image
pointer output #I pointer to output image
pointer geo #I pointer to geotran structure
pointer sx1, sy1 #I pointer to linear surface descriptors
pointer sx2, sy2 #I pointer to higher order surface descriptors
int nxsample, nysample, nincr
pointer sp, xsample, ysample, xinterp, yinterp
pointer xmsi, ymsi, jmsi, msi, xbuf, ybuf, jbuf
real shift
real gsgetr()
begin
# Allocate working space and intialize the interpolant.
call smark (sp)
call salloc (xsample, GT_NCOLS(geo), TY_REAL)
call salloc (ysample, GT_NLINES(geo), TY_REAL)
call salloc (xinterp, GT_NCOLS(geo), TY_REAL)
call salloc (yinterp, GT_NLINES(geo), TY_REAL)
# Set up sampling size.
if (GT_NCOLS(geo) == 1)
nxsample = 1
else
nxsample = GT_NCOLS(geo) / GT_XSAMPLE(geo)
if (GT_NLINES(geo) == 1)
nysample = 1
else
nysample = GT_NLINES(geo) / GT_YSAMPLE(geo)
# Initialize interpolants.
if (IM_NDIM(input) == 1) {
call asiinit (xmsi, II_LINEAR)
call asiinit (ymsi, II_LINEAR)
call asitype (GT_INTERPSTR(geo), GT_INTERPOLANT(geo),
GT_NSINC(geo), nincr, shift)
call asisinit (msi, GT_INTERPOLANT(geo), GT_NSINC(geo),
nincr, shift, 0.0)
if (GT_FLUXCONSERVE(geo) == YES)
call asiinit (jmsi, II_LINEAR)
} else {
call msiinit (xmsi, II_BILINEAR)
call msiinit (ymsi, II_BILINEAR)
call msitype (GT_INTERPSTR(geo), GT_INTERPOLANT(geo),
GT_NSINC(geo), nincr, shift)
call msisinit (msi, GT_INTERPOLANT(geo), GT_NSINC(geo),
nincr, nincr, shift, shift, 0.0)
if (GT_FLUXCONSERVE(geo) == YES)
call msiinit (jmsi, II_BILINEAR)
}
call geo_margset (sx1, sy1, sx2, sy2, GT_XMIN(geo), GT_XMAX(geo),
GT_NCOLS(geo), GT_YMIN(geo), GT_YMAX(geo), GT_NLINES(geo),
GT_INTERPOLANT(geo), GT_NSINC(geo), GT_NXYMARGIN(geo))
# Setup input image boundary extension parameters.
call geo_ref (geo, Memr[xsample], 1, GT_NCOLS(geo), GT_NCOLS(geo),
Memr[ysample], 1, GT_NLINES(geo), GT_NLINES(geo), gsgetr (sx1,
GSXMIN), gsgetr (sx1, GSXMAX), gsgetr (sx1, GSYMIN), gsgetr (sx1,
GSYMAX), GT_ONE)
call geo_imset (input, geo, sx1, sy1, sx2, sy2, Memr[xsample],
GT_NCOLS(geo), Memr[ysample], GT_NLINES(geo))
# Calculate the sampled reference coordinates and the interpolated
# reference coordinates.
call geo_ref (geo, Memr[xsample], 1, nxsample, nxsample, Memr[ysample],
1, nysample, nysample, gsgetr (sx1, GSXMIN), gsgetr (sx1, GSXMAX),
gsgetr (sx1, GSYMIN), gsgetr (sx1, GSYMAX), GT_ONE)
call geo_sample (geo, Memr[xinterp], 1, GT_NCOLS(geo), nxsample,
Memr[yinterp], 1, GT_NLINES(geo), nysample, GT_ONE)
# Initialize the buffers
xbuf = NULL
ybuf = NULL
jbuf = NULL
# Set up interpolants
call geo_xbuffer (sx1, sx2, xmsi, Memr[xsample], Memr[ysample], 1,
nxsample, 1, nysample, xbuf)
call geo_ybuffer (sy1, sy2, ymsi, Memr[xsample], Memr[ysample], 1,
nxsample, 1, nysample, ybuf)
if (GT_FLUXCONSERVE(geo) == YES && (sx2 != NULL || sy2 != NULL)) {
if (IM_NDIM(input) == 1)
call geo_jbuffer (sx1, NULL, sx2, NULL, jmsi, Memr[xsample],
Memr[ysample], 1, nxsample, 1, nysample, jbuf)
else
call geo_jbuffer (sx1, sy1, sx2, sy2, jmsi, Memr[xsample],
Memr[ysample], 1, nxsample, 1, nysample, jbuf)
}
# Transform the image.
call geo_msivector (input, output, geo, xmsi, ymsi, jmsi, msi,
sx1, sy1, sx2, sy2, Memr[xinterp], 1, GT_NCOLS(geo), nxsample,
Memr[yinterp], 1, GT_NLINES(geo), nysample, 1, 1)
# Free space.
if (IM_NDIM(input) == 1) {
call asifree (xmsi)
call asifree (ymsi)
call asifree (msi)
if (GT_FLUXCONSERVE(geo) == YES)
call asifree (jmsi)
} else {
call msifree (xmsi)
call msifree (ymsi)
call msifree (msi)
if (GT_FLUXCONSERVE(geo) == YES)
call msifree (jmsi)
}
call mfree (xbuf, TY_REAL)
call mfree (ybuf, TY_REAL)
if (jbuf != NULL)
call mfree (jbuf, TY_REAL)
call sfree (sp)
end
## GEO_IMSIVECTOR -- Evaluate the output image using interpolated surface
## coordinates.
#
#procedure geo_imsivector (in, out, geo, xmsi, ymsi, jmsi, msi, sx1, sy1, sx2,
# sy2, xref, yref, ncols, nlines)
#
#pointer in #I pointer to input image
#pointer out #I pointer to output image
#pointer geo #I pointer to geotran structure
#pointer xmsi, ymsi #I pointer to the interpolation xy surfaces
#pointer jmsi #I pointer to Jacobian surface
#pointer msi #I pointer to interpolation surface
#pointer sx1, sy1 #I linear surface descriptors
#pointer sx2, sy2 #I distortion surface pointers
#real xref[ARB] #I x reference coordinates
#real yref[ARB] #I y reference coordinates
#int ncols, nlines #I number of columns and rows
#
#int j
#pointer sp, x, y, xin, yin, xout, yout, inbuf, outbuf
#real factor
#pointer imgs1r(), imgs2r(), imps1r(), imps2r()
#real geo_jfactor()
#
#begin
# # Allocate working space.
# call smark (sp)
# call salloc (x, ncols, TY_REAL)
# call salloc (y, ncols, TY_REAL)
# call salloc (xin, ncols, TY_REAL)
# call salloc (yin, ncols, TY_REAL)
# call salloc (xout, ncols, TY_REAL)
# call salloc (yout, ncols, TY_REAL)
#
# # Fit the interpolant
# if (IM_NDIM(in) == 1)
# inbuf = imgs1r (in, 1, int (IM_LEN(in,1)))
# else
# inbuf = imgs2r (in, 1, int (IM_LEN(in,1)), 1, int (IM_LEN(in,2)))
# if (inbuf == EOF)
# call error (0, "Error reading image")
# if (IM_NDIM(in) == 1)
# call asifit (msi, Memr[inbuf], int (IM_LEN(in,1)))
# else
# call msifit (msi, Memr[inbuf], int (IM_LEN(in,1)),
# int (IM_LEN(in,2)), int (IM_LEN(in,1)))
#
# # Compute the output bufferr.
# do j = 1, nlines {
#
# # Compute coordinates.
# call amovkr (yref[j], Memr[y], ncols)
# if (IM_NDIM(in) == 1) {
# call asivector (xmsi, xref, Memr[xin], ncols)
# call asivector (ymsi, xref, Memr[yin], ncols)
# } else {
# call msivector (xmsi, xref, Memr[y], Memr[xin], ncols)
# call msivector (ymsi, xref, Memr[y], Memr[yin], ncols)
# }
#
# # Correct for out-of-bounds pixels.
# call geo_btran (in, geo, Memr[xin], Memr[yin], Memr[xout],
# Memr[yout], ncols)
#
# # Write to output image.
# if (IM_NDIM(in) == 1)
# outbuf = imps1r (out, 1, ncols)
# else
# outbuf = imps2r (out, 1, ncols, j, j)
# if (outbuf == EOF)
# call error (0, "Error writing output image")
# if (IM_NDIM(in) == 1)
# call asivector (msi, Memr[xout], Memr[outbuf], ncols)
# else
# call msivector (msi, Memr[xout], Memr[yout], Memr[outbuf],
# ncols)
#
# # Perform constant boundary extension.
# if (GT_BOUNDARY(geo) == BT_CONSTANT)
# call geo_bconstant (in, geo, Memr[xin], Memr[yin],
# Memr[outbuf], Memr[outbuf], ncols)
#
# # Preserve flux in image.
# if (GT_FLUXCONSERVE(geo) == YES) {
# factor = GT_XSCALE(geo) * GT_YSCALE(geo)
# if (GT_GEOMODE(geo) == GT_LINEAR || (sx2 == NULL && sy2 ==
# NULL)) {
# if (IM_NDIM(in) == 1)
# call amulkr (Memr[outbuf], factor * geo_jfactor (sx1,
# NULL), Memr[outbuf], ncols)
# else
# call amulkr (Memr[outbuf], factor * geo_jfactor (sx1,
# sy1), Memr[outbuf], ncols)
# } else {
# if (IM_NDIM(in) == 1)
# call geo_msiflux (jmsi, xref, yref, Memr[outbuf],
# 1, ncols, 0, 1, 1)
# else
# call geo_msiflux (jmsi, xref, yref, Memr[outbuf],
# 1, ncols, j, 1, 1)
# call amulkr (Memr[outbuf], factor, Memr[outbuf], ncols)
# }
# }
# }
#
# call sfree (sp)
#end
## GEO_IGSVECTOR -- Evaluate the output image using fitted coordinates.
#
#procedure geo_igsvector (input, output, geo, msi, xref, yref, ncols, nlines,
# sx1, sy1, sx2, sy2)
#
#pointer input #I pointer to input image
#pointer output #I pointer to output image
#pointer geo #I pointer to geotran structure
#pointer msi #I pointer to interpolant
#real xref[ARB] #I x reference array
#real yref[ARB] #I y reference array
#int ncols, nlines #I number of columns and lines
#pointer sx1, sy1 #I pointer to linear surface
#pointer sx2, sy2 #I pointer to distortion surface
#
#int j
#pointer sp, y, xin, yin, xout, yout, temp, inbuf, outbuf
#real factor
#pointer imgs1r(), imgs2r(), imps1r(), imps2r()
#real geo_jfactor()
#
#begin
# # Allocate working space.
# call smark (sp)
# call salloc (y, ncols, TY_REAL)
# call salloc (xin, ncols, TY_REAL)
# call salloc (yin, ncols, TY_REAL)
# call salloc (xout, ncols, TY_REAL)
# call salloc (yout, ncols, TY_REAL)
# call salloc (temp, ncols, TY_REAL)
#
# # Fill image buffer.
# if (IM_NDIM(input) == 1)
# inbuf = imgs1r (input, 1, int (IM_LEN(input,1)))
# else
# inbuf = imgs2r (input, 1, int (IM_LEN(input,1)), 1,
# int (IM_LEN(input,2)))
# if (inbuf == EOF)
# call error (0, "Error reading image")
#
# # Fit the interpolant.
# if (IM_NDIM(input) == 1)
# call asifit (msi, Memr[inbuf], int (IM_LEN(input,1)))
# else
# call msifit (msi, Memr[inbuf], int (IM_LEN(input,1)),
# int (IM_LEN(input,2)), int (IM_LEN(input,1)))
#
# # Calculate the x and y input image coordinates.
# do j = 1, nlines {
#
# # Get output image buffer.
# if (IM_NDIM(input) == 1)
# outbuf = imps1r (output, 1, ncols)
# else
# outbuf = imps2r (output, 1, ncols, j, j)
# if (output == EOF)
# call error (0, "Error writing output image")
#
# # Fit x coords.
# call amovkr (yref[j], Memr[y], ncols)
# call gsvector (sx1, xref, Memr[y], Memr[xin], ncols)
# if (sx2 != NULL) {
# call gsvector (sx2, xref, Memr[y], Memr[temp], ncols)
# call aaddr (Memr[xin], Memr[temp], Memr[xin], ncols)
# }
#
# # Fit y coords.
# call gsvector (sy1, xref, Memr[y], Memr[yin], ncols)
# if (sy2 != NULL) {
# call gsvector (sy2, xref, Memr[y], Memr[temp], ncols)
# call aaddr (Memr[yin], Memr[temp], Memr[yin], ncols)
# }
#
# # Compute of of bounds pixels.
# call geo_btran (input, geo, Memr[xin], Memr[yin], Memr[xout],
# Memr[yout], ncols)
#
# # Interpolate in input image.
# if (IM_NDIM(input) == 1)
# call asivector (msi, Memr[xout], Memr[outbuf], ncols)
# else
# call msivector (msi, Memr[xout], Memr[yout], Memr[outbuf],
# ncols)
#
# # Correct for constant boundary extension.
# if (GT_BOUNDARY(geo) == BT_CONSTANT)
# call geo_bconstant (input, geo, Memr[xin], Memr[yin],
# Memr[outbuf], Memr[outbuf], ncols)
#
# # Preserve flux in image.
# if (GT_FLUXCONSERVE(geo) == YES) {
# factor = GT_XSCALE(geo) * GT_YSCALE(geo)
# if (GT_GEOMODE(geo) == GT_LINEAR || (sx2 == NULL && sy2 ==
# NULL)) {
# if (IM_NDIM(input) == 1)
# call amulkr (Memr[outbuf], factor * geo_jfactor (sx1,
# NULL), Memr[outbuf], ncols)
# else
# call amulkr (Memr[outbuf], factor * geo_jfactor (sx1,
# sy1), Memr[outbuf], ncols)
# } else {
# if (IM_NDIM(input) == 1)
# call geo_gsflux (xref, yref, Memr[outbuf], 1, ncols, j,
# sx1, NULL, sx2, NULL)
# else
# call geo_gsflux (xref, yref, Memr[outbuf], 1, ncols, j,
# sx1, sy1, sx2, sy2)
# call amulkr (Memr[outbuf], factor, Memr[outbuf], ncols)
# }
# }
# }
#
# call sfree (sp)
#end
## GEO_BTRAN -- Map out-of-bounds pixel into the input image.
#
#procedure geo_btran (input, geo, xin, yin, xout, yout, ncols)
#
#pointer input #I pointer to the input image
#pointer geo #I pointer to geotran strcuture
#real xin[ARB] #I x input coords
#real yin[ARB] #I y input coords
#real xout[ARB] #O x output coords
#real yout[ARB] #O y output coords
#int ncols #I number of columns
#
#int i
#real xmax, ymax, xtemp, ytemp
#
#begin
# xmax = IM_LEN(input,1)
# if (IM_NDIM(input) == 1)
# ymax = 1.0
# else
# ymax = IM_LEN(input,2)
#
# switch (GT_BOUNDARY(geo)) {
# case BT_CONSTANT, BT_NEAREST:
# do i = 1, ncols {
# if (xin[i] < 1.0)
# xout[i] = 1.0
# else if (xin[i] > xmax)
# xout[i] = xmax
# else
# xout[i] = xin[i]
# if (yin[i] < 1.0)
# yout[i] = 1.0
# else if (yin[i] > ymax)
# yout[i] = ymax
# else
# yout[i] = yin[i]
# }
# case BT_REFLECT:
# do i = 1, ncols {
# if (xin[i] < 1.0)
# xout[i] = 1.0 + (1.0 - xin[i])
# else if (xin[i] > xmax)
# xout[i] = xmax - (xin[i] - xmax)
# else
# xout[i] = xin[i]
# if (yin[i] < 1.0)
# yout[i] = 1.0 + (1.0 - yin[i])
# else if (yin[i] > ymax)
# yout[i] = ymax - (yin[i] - ymax)
# else
# yout[i] = yin[i]
# }
# case BT_WRAP:
# do i = 1, ncols {
# xtemp = xin[i]
# ytemp = yin[i]
#
# if (xtemp < 1.0) {
# while (xtemp < 1.0)
# xtemp = xtemp + xmax
# if (xtemp < 1.0)
# xtemp = xmax - xtemp
# else if (xtemp > xmax)
# xtemp = 2.0 + xmax - xtemp
# } else if (xtemp > xmax) {
# while (xtemp > xmax)
# xtemp = xtemp - xmax
# if (xtemp < 1.0)
# xtemp = xmax - xtemp
# else if (xtemp > xmax)
# xtemp = 2.0 + xmax - xtemp
# }
# xout[i] = xtemp
#
# if (ytemp < 1.0) {
# while (ytemp < 1.0)
# ytemp = ytemp + ymax
# if (ytemp < 1.0)
# ytemp = ymax - ytemp
# else if (ytemp > ymax)
# ytemp = 2.0 + ymax - ytemp
# } else if (ytemp > ymax) {
# while (ytemp > ymax)
# ytemp = ytemp - ymax
# if (ytemp < 1.0)
# ytemp = ymax - ytemp
# else if (ytemp > ymax)
# ytemp = 2.0 + ymax - ytemp
# }
# yout[i] = ytemp
# }
# }
#end
## GEO_BCONSTANT -- Map constant out-of-bounds pixels into the input image.
#
#procedure geo_bconstant (input, geo, xin, yin, inbuf, outbuf, ncols)
#
#pointer input #I pointer to the input image
#pointer geo #I pointer to geotran structure
#real xin[ARB] #I x input coords
#real yin[ARB] #I y input coords
#real inbuf[ARB] #I input buffer
#real outbuf[ARB] #O output buffer
#int ncols #I number of columns
#
#int i
#real xmax, ymax, constant
#
#begin
# xmax = IM_LEN(input,1)
# if (IM_NDIM(input) == 1)
# ymax = 1.0
# else
# ymax = IM_LEN(input,2)
# constant = GT_CONSTANT(geo)
# do i = 1, ncols {
# if (xin[i] < 1.0 || xin[i] > xmax || yin[i] < 1.0 || yin[i] > ymax)
# outbuf[i] = constant
# else
# outbuf[i] = inbuf[i]
# }
#end
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