embed jpeg bounding box information

bbox

#!/bin/sh
# -*- encoding:utf-8 -*-

exiftool=`which exiftool`

# is exif tool already installed?
if [ -z $exiftool ]; then
  echo "please install exiftool."
  echo "sudo apt-get install libimage-exiftool-perl"
  exit 1
fi

# usage check
if [ $# -lt 1 ]; then
  echo "usage: input_jpeg [bound box value]"
  echo "  ex1. extract bounding box"
  echo "    ./bbox sample.jpg"
  echo "  ex2. embed bounding box"
  echo "    ./bbox sample.jpg 0:0:640:480 10:10:400:300"
  exit 1
fi

jpg=$1
original="$1_original"
if [ $# -eq 1 ]; then
  exiftool $jpg | while read line; do
    if echo "$line" | perl -ne'exit 1 unless /User\s*Comment\s*/i'; then
      line=`echo "$line" | sed "s/User\s*Comment\s*:\s*\(\S\)/\1/i"`
      echo "$line" | perl -nle'split"[ \t]+";print join("\t",split(":"))for @_'
    fi
  done
else
  boxes=`echo "$*"| sed 's/^\s*\S\+\s\+\(\S\)/\1/'`
  exiftool -UserComment="$boxes" $jpg
  # tmporary file remove
  if [ -e $original ]; then
    rm $original
  fi
fi