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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <imhdr.h>
# IM_VMINMAX -- Compute the minimum and maximum pixel values of an image.
# Works for images of any dimensionality, size, or datatype, although
# the min and max values can currently only be stored in the image header
# as real values.
procedure im_vminmax (im, min_value, max_value, imin_value, imax_value,
vmin, vmax)
pointer im # image descriptor
double min_value # minimum pixel value in image (real, out)
double max_value # maximum pixel value in image (real, out)
double imin_value # minimum pixel value in image (imag, out)
double imax_value # maximum pixel value in image (imag, out)
long vmin[ARB], vmax[ARB] # v vectors
bool first_line
int colmin, colmax
complex xmin_value, xmax_value, minval_x, maxval_x
long v[IM_MAXDIM], ovmin[IM_MAXDIM], ovmax[IM_MAXDIM]
short minval_s, maxval_s
long minval_l, maxval_l
pointer buf
real minval_r, maxval_r
double minval_d, maxval_d
int imgnls(), imgnll(), imgnlr(), imgnld(), imgnlx()
begin
call amovkl (long(1), v, IM_MAXDIM) # start vector
call amovkl (long(1), ovmin, IM_MAXDIM)
call amovkl (long(1), ovmax, IM_MAXDIM)
call amovkl (long(1), vmin, IM_MAXDIM)
call amovkl (long(1), vmax, IM_MAXDIM)
first_line = true
min_value = INDEFD
max_value = INDEFD
imin_value = INDEFD
imax_value = INDEFD
switch (IM_PIXTYPE(im)) {
case TY_SHORT:
while (imgnls (im, buf, v) != EOF) {
call valims (Mems[buf], IM_LEN(im,1), minval_s, maxval_s,
colmin, colmax)
if (first_line) {
min_value = minval_s
max_value = maxval_s
vmin[1] = colmin
vmax[1] = colmax
first_line = false
} else {
if (minval_s < min_value) {
min_value = minval_s
vmin[1] = colmin
call amovl (ovmin[2], vmin[2], IM_NDIM(im) - 1)
}
if (maxval_s > max_value) {
max_value = maxval_s
vmax[1] = colmax
call amovl (ovmax[2], vmax[2], IM_NDIM(im) - 1)
}
}
call amovl (v[2], ovmin[2], IM_NDIM(im) - 1)
call amovl (v[2], ovmax[2], IM_NDIM(im) - 1)
}
case TY_USHORT, TY_INT, TY_LONG:
while (imgnll (im, buf, v) != EOF) {
call valiml (Meml[buf], IM_LEN(im,1), minval_l, maxval_l,
colmin, colmax)
if (first_line) {
min_value = minval_l
max_value = maxval_l
vmin[1] = colmin
vmax[1] = colmax
first_line = false
} else {
if (minval_l < min_value) {
min_value = minval_l
vmin[1] = colmin
call amovl (ovmin[2], vmin[2], IM_NDIM(im) - 1)
}
if (maxval_l > max_value) {
max_value = maxval_l
vmax[1] = colmax
call amovl (ovmax[2], vmax[2], IM_NDIM(im) - 1)
}
}
call amovl (v[2], ovmin[2], IM_NDIM(im) - 1)
call amovl (v[2], ovmax[2], IM_NDIM(im) - 1)
}
case TY_REAL:
while (imgnlr (im, buf, v) != EOF) {
call valimr (Memr[buf], IM_LEN(im,1), minval_r, maxval_r,
colmin, colmax)
if (first_line) {
min_value = minval_r
max_value = maxval_r
vmin[1] = colmin
vmax[1] = colmax
first_line = false
} else {
if (minval_r < min_value) {
min_value = minval_r
vmin[1] = colmin
call amovl (ovmin[2], vmin[2], IM_NDIM(im) - 1)
}
if (maxval_r > max_value) {
max_value = maxval_r
vmax[1] = colmax
call amovl (ovmax[2], vmax[2], IM_NDIM(im) - 1)
}
}
call amovl (v[2], ovmin[2], IM_NDIM(im) - 1)
call amovl (v[2], ovmax[2], IM_NDIM(im) - 1)
}
case TY_DOUBLE:
while (imgnld (im, buf, v) != EOF) {
call valimd (Memd[buf], IM_LEN(im,1), minval_d, maxval_d,
colmin, colmax)
if (first_line) {
min_value = minval_d
max_value = maxval_d
vmin[1] = colmin
vmax[1] = colmax
first_line = false
} else {
if (minval_d < min_value) {
min_value = minval_d
vmin[1] = colmin
call amovl (ovmin[2], vmin[2], IM_NDIM(im) - 1)
}
if (maxval_d > max_value) {
max_value = maxval_d
vmax[1] = colmax
call amovl (ovmax[2], vmax[2], IM_NDIM(im) - 1)
}
}
call amovl (v[2], ovmin[2], IM_NDIM(im) - 1)
call amovl (v[2], ovmax[2], IM_NDIM(im) - 1)
}
case TY_COMPLEX:
while (imgnlx (im, buf, v) != EOF) {
call valimx (Memx[buf], IM_LEN(im,1), minval_x, maxval_x,
colmin, colmax)
if (first_line) {
xmin_value = minval_x
xmax_value = maxval_x
vmin[1] = colmin
vmax[1] = colmax
first_line = false
} else {
if (abs (minval_x) < abs (xmin_value)) {
xmin_value = minval_x
vmin[1] = colmin
call amovl (ovmin[2], vmin[2], IM_NDIM(im) - 1)
}
if (abs (maxval_x) > abs (xmax_value)) {
xmax_value = maxval_x
vmax[1] = colmax
call amovl (ovmax[2], vmax[2], IM_NDIM(im) - 1)
}
}
call amovl (v[2], ovmin[2], IM_NDIM(im) - 1)
call amovl (v[2], ovmax[2], IM_NDIM(im) - 1)
}
min_value = real (xmin_value)
max_value = real (xmax_value)
imin_value = aimag (xmin_value)
imax_value = aimag (xmax_value)
default:
call error (0, "Unknown pixel data type")
}
end
# ALIM -- Compute the limits (minimum and maximum values) of a vector.
procedure valims (a, npix, minval_s, maxval_s, colmin, colmax)
short a[ARB], minval_s, maxval_s, value
int colmin, colmax, npix, i
begin
minval_s = a[1]
maxval_s = a[1]
colmin = 1
colmax = 1
do i = 1, npix {
value = a[i]
if (value < minval_s) {
minval_s = value
colmin = i
} else if (value > maxval_s) {
maxval_s = value
colmax = i
}
}
end
# ALIM -- Compute the limits (minimum and maximum values) of a vector.
procedure valiml (a, npix, minval_l, maxval_l, colmin, colmax)
long a[ARB], minval_l, maxval_l, value
int colmin, colmax, npix, i
begin
minval_l = a[1]
maxval_l = a[1]
colmin = 1
colmax = 1
do i = 1, npix {
value = a[i]
if (value < minval_l) {
minval_l = value
colmin = i
} else if (value > maxval_l) {
maxval_l = value
colmax = i
}
}
end
# ALIM -- Compute the limits (minimum and maximum values) of a vector.
procedure valimr (a, npix, minval_r, maxval_r, colmin, colmax)
real a[ARB], minval_r, maxval_r, value
int colmin, colmax, npix, i
begin
minval_r = a[1]
maxval_r = a[1]
colmin = 1
colmax = 1
do i = 1, npix {
value = a[i]
if (value < minval_r) {
minval_r = value
colmin = i
} else if (value > maxval_r) {
maxval_r = value
colmax = i
}
}
end
# ALIM -- Compute the limits (minimum and maximum values) of a vector.
procedure valimd (a, npix, minval_d, maxval_d, colmin, colmax)
double a[ARB], minval_d, maxval_d, value
int colmin, colmax, npix, i
begin
minval_d = a[1]
maxval_d = a[1]
colmin = 1
colmax = 1
do i = 1, npix {
value = a[i]
if (value < minval_d) {
minval_d = value
colmin = i
} else if (value > maxval_d) {
maxval_d = value
colmax = i
}
}
end
# ALIM -- Compute the limits (minimum and maximum values) of a vector.
procedure valimx (a, npix, minval_x, maxval_x, colmin, colmax)
complex a[ARB], minval_x, maxval_x, value
int colmin, colmax, npix, i
begin
minval_x = a[1]
maxval_x = a[1]
colmin = 1
colmax = 1
do i = 1, npix {
value = a[i]
if (abs (value) < abs (minval_x)) {
minval_x = value
colmin = i
} else if (abs (value) > abs (maxval_x)) {
maxval_x = value
colmax = i
}
}
end
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