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include <imhdr.h>
# T_SKYREPLACE -- Replace objects by sky. This development code as is not
# used in the package. It is here to be worked on further when an image
# display interface is added.
procedure t_skyreplace ()
char image[SZ_FNAME] # Image to be modified
char graph[SZ_LINE], display[SZ_LINE], cmd[SZ_LINE]
pointer im, immap()
int clgeti(), wcs, key, clgcur(), nrep, skyreplace()
real wx, wy, xc, yc, r, s
begin
call clgstr ("image", image, SZ_FNAME)
call sprintf (graph, SZ_LINE, "contour %s")
call pargstr (image)
call sprintf (display, SZ_LINE, "display %s %d")
call pargstr (image)
call pargi (clgeti ("frame"))
im = immap (image, READ_WRITE, 0)
while (clgcur ("cursor",wx, wy, wcs, key, cmd, SZ_LINE) != EOF) {
switch (key) {
case 'a':
r = sqrt ((wx - xc) ** 2 + (wy - yc) ** 2)
s = 2 * r
case 'b':
nrep = skyreplace (im, xc, yc, r, s)
case 'c':
xc = wx
yc = wy
case 'd':
call imunmap (im)
call clcmdw (display)
im = immap (image, READ_WRITE, 0)
case 'g':
call imunmap (im)
call clcmdw (graph)
im = immap (image, READ_WRITE, 0)
case 'q':
break
default:
call printf ("\007")
}
}
call imunmap (im)
end
define NSKY 100 # Minimum number of sky points
int procedure skyreplace (im, xc, yc, r, s)
pointer im # IMIO pointer
real xc, yc # Object center
real r # Object aperture radius
real s # Sky aperture radius
real avg, sigma, urand(), mode, find_mode()
long seed
int xlen, ylen, nx, nx1, nx2, ny, ny1, ny2, ntotal, nobj, nallsky, nsky[4]
int i, j, x1, x2, x3, x4, y1, y2, y3, y4, y
pointer sp, allsky, sky[4], ptr1, ptr2
pointer datain, dataout, imgs2r(), imps2r()
begin
xlen = IM_LEN(im,1)
ylen = IM_LEN(im,2)
x1 = max (1, int (xc - s))
x4 = min (xlen, int (xc + s + 0.5))
y1 = max (1, int (yc - s))
y4 = min (ylen, int (yc + s + 0.5))
nx = x4 - x1 + 1
ny = y4 - y1 + 1
ntotal = nx * ny
x2 = max (1, int (xc - r))
x3 = min (xlen, int (xc + r + 0.5))
y2 = max (1, int (yc - r))
y3 = min (xlen, int (yc + r + 0.5))
nx1 = (x3 - x2 + 1)
ny1 = (y3 - y2 + 1)
nobj = nx1 * ny1
nallsky = ntotal - nobj
if ((nallsky < NSKY) || (nobj < 1))
return (0)
call smark (sp)
call salloc (allsky, nallsky, TY_REAL)
datain = imgs2r (im, x1, x4, y1, y4)
dataout = imps2r (im, x2, x3, y2, y3)
ptr2 = allsky
# First quadrant
x2 = max (1, int (xc - r))
x3 = min (xlen, int (xc + 0.5))
y2 = max (1, int (yc - r))
y3 = min (xlen, int (yc + 0.5))
nx1 = x3 - x1 + 1
nx2 = x3 - x2
ny1 = y2 - y1
ny2 = y3 - y2 + 1
nsky[1] = nx1 * ny1 + nx2 * ny2
sky[1] = ptr2
if (nsky[1] > 0) {
ptr1 = datain
for (y=y1; y<y2; y=y+1) {
call amovr (Memr[ptr1], Memr[ptr2], nx1)
ptr1 = ptr1 + nx
ptr2 = ptr2 + nx1
}
for (; y<=y3; y=y+1) {
call amovr (Memr[ptr1], Memr[ptr2], nx2)
ptr1 = ptr1 + nx
ptr2 = ptr2 + nx2
}
}
# Second quadrant
x2 = max (1, int (xc + 1.5))
x3 = min (xlen, int (xc + r + 0.5))
y2 = max (1, int (yc - r))
y3 = min (xlen, int (yc + 0.5))
nx1 = x4 - x2 + 1
nx2 = x4 - x3
ny1 = y2 - y1
ny2 = y3 - y2 + 1
nsky[2] = nx1 * ny1 + nx2 * ny2
sky[2] = ptr2
if (nsky[2] > 0) {
ptr1 = datain + x2 - x1
for (y=y1; y<y2; y=y+1) {
call amovr (Memr[ptr1], Memr[ptr2], nx1)
ptr1 = ptr1 + nx
ptr2 = ptr2 + nx1
}
ptr1 = ptr1 + x3 - x2 + 1
for (; y<=y3; y=y+1) {
call amovr (Memr[ptr1], Memr[ptr2], nx2)
ptr1 = ptr1 + nx
ptr2 = ptr2 + nx2
}
}
# Third quadrant
x2 = max (1, int (xc - r))
x3 = min (xlen, int (xc + 0.5))
y2 = max (1, int (yc + 1.5))
y3 = min (xlen, int (yc + r + 0.5))
nx1 = x3 - x2
nx2 = x3 - x1 + 1
ny1 = y3 - y2 + 1
ny2 = y4 - y3
nsky[3] = nx1 * ny1 + nx2 * ny2
sky[3] = ptr2
if (nsky[3] > 0) {
ptr1 = datain + (y2 - y1) * nx
for (y=y2; y<=y3; y=y+1) {
call amovr (Memr[ptr1], Memr[ptr2], nx1)
ptr1 = ptr1 + nx
ptr2 = ptr2 + nx1
}
for (; y<=y4; y=y+1) {
call amovr (Memr[ptr1], Memr[ptr2], nx2)
ptr1 = ptr1 + nx
ptr2 = ptr2 + nx2
}
}
# Fourth quadrant
x2 = max (1, int (xc + 1.5))
x3 = min (xlen, int (xc + r + 0.5))
y2 = max (1, int (yc + 1.5))
y3 = min (xlen, int (yc + r + 0.5))
nx1 = x4 - x3
nx2 = x4 - x2 + 1
ny1 = y3 - y2 + 1
ny2 = y4 - y3
nsky[4] = ny1 * nx1 + ny2 * nx2
sky[4] = ptr2
if (nsky[4] > 0) {
ptr1 = datain + (y2 - y1) * nx + x3 - x1 + 1
for (y=y2; y<=y3; y=y+1) {
call amovr (Memr[ptr1], Memr[ptr2], nx1)
ptr1 = ptr1 + nx
ptr2 = ptr2 + nx1
}
ptr1 = ptr1 - (x3 - x2 + 1)
for (; y<=y4; y=y+1) {
call amovr (Memr[ptr1], Memr[ptr2], nx2)
ptr1 = ptr1 + nx
ptr2 = ptr2 + nx2
}
}
# This part is for doing a gradient correction. It is not implemented.
# if ((nsky[1]>NSKY)&&(nsky[2]>NSKY)&&(nsky[3]>NSKY)&&(nsky[4]>NSKY)) {
# call asrtr (Memr[sky[1]], Memr[sky[1]], nsky[1])
# call asrtr (Memr[sky[2]], Memr[sky[2]], nsky[2])
# call asrtr (Memr[sky[3]], Memr[sky[3]], nsky[3])
# call asrtr (Memr[sky[4]], Memr[sky[4]], nsky[4])
# Add a gradient correction here.
# seed = dataout
# do i = dataout, dataout+nobj-1 {
# j = 4 * urand (seed) + 1
# k = 0.95 * nsky[j] * urand (seed)
# Memr[i] = Memr[sky[j]+k]
# }
# } else {
call asrtr (Memr[allsky], Memr[allsky], nallsky)
# Find the mean and sigma excluding the outer 20%
x1 = 0.1 * nallsky
x2 = 0.9 * nallsky
call aavgr (Memr[allsky+x1-1], x2-x1+1, avg, sigma)
mode = find_mode (Memr[allsky], nallsky, nallsky / 20)
call printf ("Mean = %g, Median = %g, Mode = %g\n")
call pargr (avg)
call pargr (Memr[allsky+nallsky/2-1])
call pargr (mode)
for (x1=0; (x1<nallsky)&&(Memr[allsky+x1]<avg-3*sigma); x1=x1+1)
;
for (x2=nallsky-1; (x2>0)&&(Memr[allsky+x2]>avg+3*sigma); x2=x2-1)
;
nx = x2 - x1 - 1
seed = dataout
do i = dataout, dataout+nobj-1 {
j = nx * urand (seed) + x1
Memr[i] = Memr[allsky+j]
}
# }
call sfree (sp)
return (nobj)
end
real procedure find_mode (data, npts, n)
real data[npts] # Data
int npts # Number of data points
int n # Bin size
int x, xlast, xmin
real sumx, sumy, sumxx, sumxy, a, amin
pointer sp, slope
begin
call smark (sp)
call salloc (slope, npts - n, TY_REAL)
sumx = 0.
sumy = 0.
sumxx = 0.
sumxy = 0.
x = 0
xlast = 0
while (x < n) {
x = x + 1
sumx = sumx + x
sumy = sumy + data[x]
sumxx = sumxx + x ** 2
sumxy = sumxy + x * data[x]
}
amin = (n * sumxy - sumx * sumy) / (n * sumxx - sumx ** 2)
xmin = (x + xlast) / 2
Memr[slope] = amin
while (x < npts - n) {
x = x + 1
xlast = xlast + 1
sumx = sumx + x - xlast
sumy = sumy + data[x] - data[xlast]
sumxx = sumxx + x * x - xlast * xlast
sumxy = sumxy + x * data[x] - xlast * data[xlast]
a = (n * sumxy - sumx * sumy) / (n * sumxx - sumx ** 2)
if (a < amin) {
amin = a
xmin = (x + xlast) / 2
}
Memr[slope+xlast] = a
}
call gplotv (Memr[slope+11], npts-2*n-22, 1., real (npts-2*n-22), "")
call sfree (sp)
return (data[xmin])
end
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