webcam

#!/bin/bash
ARCHIVE=~/webcam
mkdir -p archives
while [[ 1 ]]
do
mplayer -vo png -frames 2 tv:// > /dev/null 2>&1
convert 00000002.png 00000002.jpg
DIR=`date +'%Y-%m-%d/%H/%M'`
DATE=`date`
ARCHIVE=archives/`date +'%Y-%m-%d_%H_%M_%S'`.jpg
[[ ! -d $DIR ]] && mkdir -p $DIR
FILE=$DIR/`date +'%S'`.jpg
mv 00000002.jpg $FILE
rm -f latest.jpg
ln -s $FILE latest.jpg

cmp()
{
    compare -fuzz 10% $1 $2 diff.jpg
    convert diff.jpg +dither -colors 2 -normalize diff_norm.jpg
    deviation=`identify -verbose diff_norm.jpg | grep 'deviation' | tail -1 | awk '{print $3}'`
    [[ `echo "$deviation > 10" | bc` -eq '1' ]] && return 1
    return 0
}

if [[ -r $LAST_FILE ]]; then
    cmp $LAST_FILE $FILE
    if [[ $? == 1 ]]; then
        echo "Motion detected, deviation = $deviation"
        cp $FILE $ARCHIVE
        rm -f latest_archive.jpg
        ln -s $ARCHIVE latest_archive.jpg
        PREV_FILE=$LAST_FILE
        scp -C $ARCHIVE chou.it:~/public/webcam &
        echo "Motion detected at $DATE, URL: http://chou.it/public/webcam/`basename $ARCHIVE`" |mutt -s "WARNING: Invasion detected" lex@chou.it -a $ARCHIVE
    fi
fi
LAST_FILE=$FILE
sleep 1
done