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include <math/gsurfit.h>
# CR_FIND -- Find cosmic ray candidates.
# This procedure is an interface to special procedures specific to a given
# window size.
procedure cr_find (cr, threshold, data, nc, nl, col, line,
sf1, sf2, x, y, z, w)
pointer cr # Cosmic ray list
real threshold # Detection threshold
pointer data[ARB] # Data lines
int nc # Number of columns
int nl # Number of lines
int col # First column
int line # Center line
pointer sf1, sf2 # Surface fitting
real x[ARB], y[ARB], z[ARB], w[ARB] # Surface arrays
pointer a, b, c, d, e, f, g
begin
switch (nl) {
case 5:
a = data[1]
b = data[2]
c = data[3]
d = data[4]
e = data[5]
call cr_find5 (cr, threshold, col, line, Memr[a], Memr[b],
Memr[c], Memr[d], Memr[e], nc, sf1, sf2, x, y, z, w)
case 7:
a = data[1]
b = data[2]
c = data[3]
d = data[4]
e = data[5]
f = data[6]
g = data[7]
call cr_find7 (cr, threshold, col, line, Memr[a], Memr[b],
Memr[c], Memr[d], Memr[e], Memr[f], Memr[g], nc,
sf1, sf2, x, y, z, w)
}
end
# CR_FIND7 -- Find cosmic rays candidates in 7x7 window.
# This routine finds cosmic rays candidates with the following algorithm.
# 1. If the pixel is not a local maximum relative to it's 48 neighbors
# go on to the next pixel.
# 2. Identify the next strongest pixel in the 7x7 region.
# This suspect pixel is excluded in the following.
# 2. Compute the flux of the 7x7 region excluding the cosmic ray
# candidate and the suspect pixel.
# 3. The candidate must exceed the average flux per pixel by a specified
# threshold. If not go on to the next pixel.
# 4. Fit a plane to the border pixels (excluding the suspect pixel).
# 5. Subtract the background defined by the plane.
# 6. Determine a replacement value as the average of the four adjacent
# pixels (excluding the suspect pixels).
# 7. Add the pixel to the cosmic ray candidate list.
procedure cr_find7 (cr, threshold, col, line, a, b, c, d, e, f, g, n,
sf1, sf2, x, y, z, w)
pointer cr # Cosmic ray list
real threshold # Detection threshold
int col # First column
int line # Line
real a[ARB], b[ARB], c[ARB], d[ARB] # Image lines
real e[ARB], f[ARB], g[ARB] # Image lines
int n # Number of columns
pointer sf1, sf2 # Surface fitting
real x[49], y[49], z[49], w[49] # Surface arrays
real bkgd[49]
int i1, i2, i3, i4, i5, i6, i7, j, j1, j2
real p, flux, replace, asumr()
pointer sf
begin
for (i4=4; i4<=n-3; i4=i4+1) {
# Must be local maxima.
p = d[i4]
if (p<a[i4]||p<b[i4]||p<c[i4]||p<e[i4]||p<f[i4]||p<g[i4])
next
i1 = i4 - 3
if (p<a[i1]||p<b[i1]||p<c[i1]||p<d[i1]||p<e[i1]||p<f[i1]||p<g[i1])
next
i2 = i4 - 2
if (p<a[i2]||p<b[i2]||p<c[i2]||p<d[i2]||p<e[i2]||p<f[i2]||p<g[i2])
next
i3 = i4 - 1
if (p<a[i3]||p<b[i3]||p<c[i3]||p<d[i3]||p<e[i3]||p<f[i3]||p<g[i3])
next
i5 = i4 + 1
if (p<a[i5]||p<b[i5]||p<c[i5]||p<d[i5]||p<e[i5]||p<f[i5]||p<g[i5])
next
i6 = i4 + 2
if (p<a[i6]||p<b[i6]||p<c[i6]||p<d[i6]||p<e[i6]||p<f[i6]||p<g[i6])
next
i7 = i4 + 3
if (p<a[i7]||p<b[i7]||p<c[i7]||p<d[i7]||p<e[i7]||p<f[i7]||p<g[i7])
next
# Convert to a single array in surface fitting order.
call amovr (a[i1], z[1], 7)
z[8] = b[i7]; z[9] = c[i7]; z[10] = d[i7]; z[11] = e[i7]
z[12] = f[i7]; z[13] = g[i7]; z[14] = g[i6]; z[15] = g[i5]
z[16] = f[i4]; z[17] = g[i3]; z[18] = g[i2]; z[19] = g[i1]
z[20] = f[i1]; z[21] = e[i1]; z[22] = d[i1]; z[23] = c[i1]
z[24] = b[i1]
call amovr (b[i2], z[25], 5)
call amovr (c[i2], z[30], 5)
call amovr (d[i2], z[35], 5)
call amovr (e[i2], z[40], 5)
call amovr (f[i2], z[45], 5)
# Find the highest point excluding the center.
j1 = 37; j2 = 1
do j = 2, 49 {
if (j == j1)
next
if (z[j] > z[j2])
j2 = j
}
# Compute the flux excluding the extreme points.
flux = (asumr (z, 49) - z[j1] - z[j2]) / 47
# Pixel must be exceed specified threshold.
if (p < flux + threshold)
next
# Fit and subtract the background.
if (j2 < 25) {
w[j2] = 0
sf = sf2
call gsfit (sf, x, y, z, w, 24, WTS_USER, j)
w[j2] = 1
} else {
sf = sf1
call gsrefit (sf, x, y, z, w, j)
}
call gsvector (sf, x, y, bkgd, 49)
call asubr (z, bkgd, z, 49)
p = z[j1]
# Compute the flux excluding the extreme points.
flux = (asumr (z, 49) - z[j1] - z[j2]) / 47
# Determine replacement value from four nearest neighbors again
# excluding the most deviant pixels.
replace = 0
j = 0
if (j2 != 32) {
replace = replace + c[i4]
j = j + 1
}
if (j2 != 36) {
replace = replace + d[i3]
j = j + 1
}
if (j2 != 38) {
replace = replace + d[i5]
j = j + 1
}
if (j2 != 42) {
replace = replace + e[i4]
j = j + 1
}
replace = replace / j
# Add pixel to cosmic ray list.
flux = 100. * flux
call cr_add (cr, col+i4-1, line, flux, flux/p, 0., replace, 0)
i4 = i7
}
end
# CR_FIND5 -- Find cosmic rays candidates in 5x5 window.
# This routine finds cosmic rays candidates with the following algorithm.
# 1. If the pixel is not a local maximum relative to it's 24 neighbors
# go on to the next pixel.
# 2. Identify the next strongest pixel in the 5x5 region.
# This suspect pixel is excluded in the following.
# 2. Compute the flux of the 5x5 region excluding the cosmic ray
# candidate and the suspect pixel.
# 3. The candidate must exceed the average flux per pixel by a specified
# threshold. If not go on to the next pixel.
# 4. Fit a plane to the border pixels (excluding the suspect pixel).
# 5. Subtract the background defined by the plane.
# 6. Determine a replacement value as the average of the four adjacent
# pixels (excluding the suspect pixels).
# 7. Add the pixel to the cosmic ray candidate list.
procedure cr_find5 (cr, threshold, col, line, a, b, c, d, e, n,
sf1, sf2, x, y, z, w)
pointer cr # Cosmic ray list
real threshold # Detection threshold
int col # First column
int line # Line
real a[ARB], b[ARB], c[ARB], d[ARB], e[ARB] # Image lines
int n # Number of columns
pointer sf1, sf2 # Surface fitting
real x[25], y[25], z[25], w[25] # Surface arrays
real bkgd[25]
int i1, i2, i3, i4, i5, j, j1, j2
real p, flux, replace, asumr()
pointer sf
begin
for (i3=3; i3<=n-2; i3=i3+1) {
# Must be local maxima.
p = c[i3]
if (p<a[i3]||p<b[i3]||p<d[i3]||p<e[i3])
next
i1 = i3 - 2
if (p<a[i1]||p<b[i1]||p<c[i1]||p<d[i1]||p<e[i1])
next
i2 = i3 - 1
if (p<a[i2]||p<b[i2]||p<c[i2]||p<d[i2]||p<e[i2])
next
i4 = i3 + 1
if (p<a[i4]||p<b[i4]||p<c[i4]||p<d[i4]||p<e[i4])
next
i5 = i3 + 2
if (p<a[i5]||p<b[i5]||p<c[i5]||p<d[i5]||p<e[i5])
next
# Convert to a single array in surface fitting order.
call amovr (a[i1], z[1], 5)
z[6] = b[i5]; z[7] = c[i5]; z[8] = d[i5]; z[9] = e[i5]
z[10] = e[i4]; z[11] = e[i3]; z[12] = e[i2]; z[13] = e[i1]
z[14] = d[i1]; z[15] = c[i1]; z[16] = b[i1]
call amovr (b[i2], z[17], 3)
call amovr (c[i2], z[20], 3)
call amovr (d[i2], z[23], 3)
# Find the highest point excluding the center.
j1 = 21; j2 = 1
do j = 2, 25 {
if (j == j1)
next
if (z[j] > z[j2])
j2 = j
}
# Compute the flux excluding the extreme points.
flux = (asumr (z, 25) - z[j1] - z[j2]) / 23
# Pixel must be exceed specified threshold.
if (p < flux + threshold)
next
# Fit and subtract the background.
if (j2 < 17) {
w[j2] = 0
sf = sf2
call gsfit (sf, x, y, z, w, 16, WTS_USER, j)
w[j2] = 1
} else {
sf = sf1
call gsrefit (sf, x, y, z, w, j)
}
call gsvector (sf, x, y, bkgd, 25)
call asubr (z, bkgd, z, 25)
p = z[j1]
# Compute the flux excluding the extreme points.
flux = (asumr (z, 25) - z[j1] - z[j2]) / 23
# Determine replacement value from four nearest neighbors again
# excluding the most deviant pixels.
replace = 0
j = 0
if (j2 != 18) {
replace = replace + b[i3]
j = j + 1
}
if (j2 != 20) {
replace = replace + c[i2]
j = j + 1
}
if (j2 != 22) {
replace = replace + c[i4]
j = j + 1
}
if (j2 != 24) {
replace = replace + d[i3]
j = j + 1
}
replace = replace / j
# Add pixel to cosmic ray list.
flux = 100. * flux
call cr_add (cr, col+i3-1, line, flux, flux/p, 0., replace, 0)
i3 = i5
}
end
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