added threshold scripts

1 files changed, 213 insertions, 0 deletions

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+#!/bin/bash
+#
+# Developed by Fred Weinhaus 8/30/2012 .......... revised 11/3/2015
+#
+# ------------------------------------------------------------------------------
+# 
+# Licensing:
+# 
+# Copyright © Fred Weinhaus
+# 
+# My scripts are available free of charge for non-commercial use, ONLY.
+# 
+# For use of my scripts in commercial (for-profit) environments or 
+# non-free applications, please contact me (Fred Weinhaus) for 
+# licensing arrangements. My email address is fmw at alink dot net.
+# 
+# If you: 1) redistribute, 2) incorporate any of these scripts into other 
+# free applications or 3) reprogram them in another scripting language, 
+# then you must contact me for permission, especially if the result might 
+# be used in a commercial or for-profit environment.
+# 
+# My scripts are also subject, in a subordinate manner, to the ImageMagick 
+# license, which can be found at: http://www.imagemagick.org/script/license.php
+# 
+# ------------------------------------------------------------------------------
+# 
+####
+#
+# USAGE: ptilethresh [-p percentile] infile outfile
+# USAGE: ptilethresh [-h or -help]
+#
+# OPTIONS:
+#
+# -p    percentile    percentile on cumulative histogram for desired threshold;
+#                     0<=float<=100; default=50
+#
+###
+#
+# NAME: PTILETHRESH
+# 
+# PURPOSE: To automatically thresholds an image to binary (b/w) format 
+# at a specified percentile on the cumulative histogram.
+# 
+# DESCRIPTION: PTILETHRESH automatically thresholds an image to binary 
+# (b/w) format at a specified percentile on the cumulative histogram. When 
+# the percentile is 50%, this technique is also known as balanced thresholding. 
+# 
+# OPTIONS: 
+# 
+# -p percentile ... PERCENTILE is the desired threshold point on the cumulative 
+# histogram. Values are floats between 0 and 100. The default=50.
+# 
+# NOTE: It is highly recommended that the output not be specified 
+# as a JPG image as that will cause compression and potentially a 
+# non-binary (i.e. a graylevel) result. GIF is the recommended 
+# output format.
+# 
+# REFERENCES:
+# http://en.wikipedia.org/wiki/Balanced_histogram_thresholding
+# http://www.pvv.org/~perchrh/papers/datasyn/paper2/report.pdf
+# 
+# CAVEAT: No guarantee that this script will work on all platforms, 
+# nor that trapping of inconsistent parameters is complete and 
+# foolproof. Use At Your Own Risk. 
+# 
+######
+#
+
+# set default values
+percentile=50
+
+
+# set directory for temporary files
+dir="."    # suggestions are dir="." or dir="/tmp"
+
+# set up functions to report Usage and Usage with Description
+PROGNAME=`type $0 | awk '{print $3}'`  # search for executable on path
+PROGDIR=`dirname $PROGNAME`            # extract directory of program
+PROGNAME=`basename $PROGNAME`          # base name of program
+usage1() 
+	{
+	echo >&2 ""
+	echo >&2 "$PROGNAME:" "$@"
+	sed >&2 -e '1,/^####/d;  /^###/g;  /^#/!q;  s/^#//;  s/^ //;  4,$p' "$PROGDIR/$PROGNAME"
+	}
+usage2() 
+	{
+	echo >&2 ""
+	echo >&2 "$PROGNAME:" "$@"
+	sed >&2 -e '1,/^####/d;  /^######/g;  /^#/!q;  s/^#*//;  s/^ //;  4,$p' "$PROGDIR/$PROGNAME"
+	}
+
+
+# function to report error messages
+errMsg()
+	{
+	echo ""
+	echo $1
+	echo ""
+	usage1
+	exit 1
+	}
+
+
+# function to test for minus at start of value of second part of option 1 or 2
+checkMinus()
+	{
+	test=`echo "$1" | grep -c '^-.*$'`   # returns 1 if match; 0 otherwise
+    [ $test -eq 1 ] && errMsg "$errorMsg"
+	}
+
+# test for correct number of arguments and get values
+if [ $# -eq 0 ]
+	then
+	# help information
+   echo ""
+   usage2
+   exit 0
+elif [ $# -gt 4 ]
+	then
+	errMsg "--- TOO MANY ARGUMENTS WERE PROVIDED ---"
+else
+	while [ $# -gt 0 ]
+		do
+			# get parameter values
+			case "$1" in
+		  -h|-help)    # help information
+					   echo ""
+					   usage2
+					   exit 0
+					   ;;
+				-p)    # get percentile
+					   shift  # to get the next parameter
+					   # test if parameter starts with minus sign 
+					   errorMsg="--- INVALID PERCENTILE SPECIFICATION ---"
+					   checkMinus "$1"
+					   percentile=`expr "$1" : '\([.0-9]*\)'`
+					   [ "$percentile" = "" ] && errMsg "--- PERCENTILE=$percentile MUST BE A NON-NEGATIVE FLOAT ---"
+					   testA=`echo "$percentile < 0" | bc`
+					   testB=`echo "$percentile > 100" | bc`
+					   [ $testA -eq 1 -o $testB -eq 1 ] && errMsg "--- PERCENTILE=$percentile MUST BE A FLOAT BETWEEN 0 AND 100 ---"
+					   ;;
+				 -)    # STDIN and end of arguments
+					   break
+					   ;;
+				-*)    # any other - argument
+					   errMsg "--- UNKNOWN OPTION ---"
+					   ;;
+		     	 *)    # end of arguments
+					   break
+					   ;;
+			esac
+			shift   # next option
+	done
+	#
+	# get infile and outfile
+	infile="$1"
+	outfile="$2"
+fi
+
+# test that infile provided
+[ "$infile" = "" ] && errMsg "NO INPUT FILE SPECIFIED"
+
+# test that outfile provided
+[ "$outfile" = "" ] && errMsg "NO OUTPUT FILE SPECIFIED"
+
+
+tmpA1="$dir/ptilethresh_1_$$.mpc"
+tmpA2="$dir/ptilethresh_1_$$.cache"
+trap "rm -f $tmpA1 $tmpA2 exit 0;" 0
+trap "rm -f $tmpA1 $tmpA2; exit 1" 1 2 3 15
+
+# get im_version
+im_version=`convert -list configure | \
+	sed '/^LIB_VERSION_NUMBER /!d; s//,/;  s/,/,0/g;  s/,0*\([0-9][0-9]\)/\1/g' | head -n 1`
+
+# colorspace RGB and sRGB swapped between 6.7.5.5 and 6.7.6.7 
+# though probably not resolved until the latter
+# then -colorspace gray changed to linear between 6.7.6.7 and 6.7.8.2 
+# then -separate converted to linear gray channels between 6.7.6.7 and 6.7.8.2,
+# though probably not resolved until the latter
+# so -colorspace HSL/HSB -separate and -colorspace gray became linear
+# but we need to use -set colorspace RGB before using them at appropriate times
+# so that results stay as in original script
+# The following was determined from various version tests using ptilethresh.
+# with IM 6.7.4.10, 6.7.6.10, 6.7.9.10
+if [ "$im_version" -lt "06070607" -o "$im_version" -gt "06070707" ]; then
+	setcspace="-set colorspace RGB"
+else
+	setcspace=""
+fi
+# no need for setcspace for grayscale or channels after 6.8.5.4
+if [ "$im_version" -gt "06080504" ]; then
+	setcspace=""
+fi
+
+
+if convert -quiet "$infile" +repage "$tmpA1"
+	then
+	: ' do nothing '
+else
+	errMsg "--- FILE $infile DOES NOT EXIST OR IS NOT AN ORDINARY FILE, NOT READABLE OR HAG ZERO SIZE ---"
+fi	
+
+bpt=$percentile
+wpt=`convert xc: -format "%[fx:100-$bpt]" info:`
+# process image
+convert $tmpA1 $setcspace -colorspace gray -linear-stretch $bpt%,$wpt% "$outfile"
+
+exit 0
+
+
+