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#!/usr/bin/bash
# 10Jan2017: V2 (pix are pushed to STAN for processing; replace TIMERS with PATH services)
# SJP 30 Dec 2015 V1 (Copy and process photos from a cam-equipped raspi)
########### Constants ##################
# These variables are defined in a local file "paths.config". The follwoing assignments
# show the format for the variables.
web="example.com:/path/to/remote/camrootdir" # web server. configured in paths.config
thisdir="/path/to/cams" # this directory (on this computer) Configured in paths.config
# cam names in an array:
declare -a camz=(cam1 cam2 cam3...)
if [ -e /usr/local/share/paths.config ]; then
. /usr/local/share/paths.config
else echo "paths.config does not exist, see readme"; exit 1
fi
########### end Consts ################
cd ${thisdir} # root directory for uploaded pix
for campi in "${camz[@]}"
do
threshold=2000 # minimum value of average pixel brightness. Tests if pic is too dark
if [ "${campi}" = "lucerne" ] ; then
threshold=6000 # shocking hack to compensate for new cam type
fi
# filename of the latest photo
newpic=$(ls "$campi"/*.jpg -t 2>/dev/null | head -1)
# echo newpic=$newpic
# Is there a 'mark' file for this camera?
if [ -e mark-${campi} ]; then
# Is the newest pic older than (-ot) the marker we placed previously?
if [ "$newpic" -ot mark-"$campi" ]; then
continue # exit this iteration of the FOR loop.
fi
else
touch mark-$campi # should only happen on the first ever execution
fi
# Check to see if the pic is too dark (i.e. taken at night)
mean=$(identify -format %[mean] ${newpic} | sed s/[.].*//)
# echo "mean is $mean"
# Test to see if it is too dark (nighttime)
if [[ "${mean}" -lt "${threshold}" ]] ; then
rm $newpic
# echo mean of $mean is too low. It is nighttime.
continue
fi
# Improve sharpness and resize photo, ready for upload to webserver
# Break into two steps to avoid out-of-memory errors (OS kills process)
convert ${newpic} -unsharp 1.5x1+0.7+0.02 transfer.jpg
convert transfer.jpg -resize 33% -quality 70 transfer.jpg
# Create a marker file with the name of the webcam, so next time we can
# check to see if a new photo is present for that camera; the PATH
# may have been triggered by a photo from another camera.
touch mark-$campi
# upload latest pic to web server
scp transfer.jpg ${web}/${campi}/.
touch bump-$(hostname)
scp bump-$(hostname) ${web}/.
rm transfer.jpg
# cleanup any empty directories (such as when files are swept by another process)
find ${campi}/. -type d -empty -delete
# but DON'T delete the cam directories themselves. The cams expect them to exist.
done
#exit(0) # force success exit code for fussy systemd
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