From fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 Mon Sep 17 00:00:00 2001
From: Joseph Hunkeler <jhunkeler@gmail.com>
Date: Wed, 8 Jul 2015 20:46:52 -0400
Subject: Initial commit

---
 noao/imred/vtel/trim.x | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 noao/imred/vtel/trim.x

(limited to 'noao/imred/vtel/trim.x')

diff --git a/noao/imred/vtel/trim.x b/noao/imred/vtel/trim.x
new file mode 100644
index 00000000..8e76489b
--- /dev/null
+++ b/noao/imred/vtel/trim.x
@@ -0,0 +1,75 @@
+include <mach.h>
+include <imhdr.h>
+include "vt.h"
+
+# TRIM -- Trim a full disk image using the squibby brightness template.
+# Leave all the squibby brightness information intact, set data outside the
+# limb to zero.
+
+procedure t_trim()
+
+char	image[SZ_FNAME]		# image to trim
+int	threshold		# squibby brightness threshold defining limb
+
+int	i, numpix
+pointer	im, lgp, lpp
+pointer	immap(), imgl2s(), impl2s()
+int	clgeti()
+errchk	immap, imgl2s, impl2s
+
+begin
+	# Get parameters from the CL.
+	call clgstr ("image", image, SZ_FNAME)
+	threshold = clgeti("threshold")
+
+	# Open image.
+	im = immap (image, READ_WRITE, 0)
+
+	do i = 1, IM_LEN(im,2) {
+	    lgp = imgl2s (im, i)
+	    lpp = impl2s (im, i)
+	    numpix = IM_LEN(im,1)
+	    call trimline (Mems[lgp], Mems[lpp], numpix, threshold)
+	}
+
+	# Unmap image.
+	call imunmap (im)
+end
+
+
+# TRIMLINE -- trim line1 and put it into line2.
+
+procedure trimline (line1, line2, numpix, threshold)
+
+short	line1[numpix]		# input line
+short	line2[numpix]		# output line
+int	numpix			# number of pixels in this line
+int	threshold		# squibby brightness threshold
+
+int	i, left, right
+
+begin
+	left = 0
+	right = 0
+
+	do i = 1, numpix {
+	    if (and(int(line1[i]),17B) >= threshold) {
+	        left = i
+	        break
+	    } else
+		line2[i] = and(int(line1[i]),17B)
+	}
+
+	if (left != 0)
+	    do i = numpix, 1, -1 {
+	        if(and(int(line1[i]),17B) >= threshold) {
+	            right = i
+	            break
+	        } else
+		    line2[i] = and(int(line1[i]),17B)
+	    }
+
+	if (left != 0 && right != 0 && left < right)
+	    do i = left, right
+		line2[i] = line1[i]
+end
-- 
cgit