#!/usr/bin/python

# You need to install PIL to run this script

# type "sudo apt-get install python-imaging-tk" in an terminal window to do this

import StringIO

import subprocess

import os

import time

from datetime import datetime

from PIL import Image

# Motion detection settings:

# Threshold - how much a pixel has to change by to be marked as "changed"

# Sensitivity - how many changed pixels before capturing an image, needs to be higher if noisy view

# ForceCapture - whether to force an image to be captured every forceCaptureTime seconds, values True or False

# filepath - location of folder to save photos

# filenamePrefix - string that prefixes the file name for easier identification of files.

# diskSpaceToReserve - Delete oldest images to avoid filling disk. How much byte to keep free on disk.

# cameraSettings - "" = no extra settings; "-hf" = Set horizontal flip of image; "-vf" = Set vertical flip; "-hf -vf" = both horizontal and vertical flip

threshold = 10

sensitivity = 20

forceCapture = True

forceCaptureTime = 60 * 60 # Once an hour

filepath = "/home/pi/aspice"

filenamePrefix = "capture"

diskSpaceToReserve = 40 * 1024 * 1024 # Keep 40 mb free on disk

cameraSettings = ""

# settings of the photos to save

saveWidth = 1296

saveHeight = 972

saveQuality = 15 # Set jpeg quality (0 to 100)

# Test-Image settings

testWidth = 100

testHeight = 75

# this is the default setting, if the whole image should be scanned for changed pixel

testAreaCount = 1

testBorders = [ [[1,testWidth],[1,testHeight]] ] # [ [[start pixel on left side,end pixel on right side],[start pixel on top side,stop pixel on bottom side]] ]

# testBorders are NOT zero-based, the first pixel is 1 and the last pixel is testWith or testHeight

# with "testBorders", you can define areas, where the script should scan for changed pixel

# for example, if your picture looks like this:

#

# ....XXXX

# ........

# ........

#

# "." is a street or a house, "X" are trees which move arround like crazy when the wind is blowing

# because of the wind in the trees, there will be taken photos all the time. to prevent this, your setting might look like this:

# testAreaCount = 2

# testBorders = [ [[1,50],[1,75]], [[51,100],[26,75]] ] # area y=1 to 25 not scanned in x=51 to 100

# even more complex example

# testAreaCount = 4

# testBorders = [ [[1,39],[1,75]], [[40,67],[43,75]], [[68,85],[48,75]], [[86,100],[41,75]] ]

# in debug mode, a file debug.bmp is written to disk with marked changed pixel an with marked border of scan-area

# debug mode should only be turned on while testing the parameters above

debugMode = False # False or True

# Capture a small test image (for motion detection)

def captureTestImage(settings, width, height):

return im, buffer

# Save a full size image to disk

def saveImage(settings, width, height, quality, diskSpaceToReserve):

print "Captured %s" % filename

# Keep free space above given level

def keepDiskSpaceFree(bytesToReserve):

return

# Get available disk space

def getFreeSpace():

st = os.statvfs(filepath + "/")

du = st.f_bavail * st.f_frsize

return du

# Get first image

image1, buffer1 = captureTestImage(cameraSettings, testWidth, testHeight)

# Reset last capture time

lastCapture = time.time()

while (True):

# Get comparison image

image2, buffer2 = captureTestImage(cameraSettings, testWidth, testHeight)

# Count changed pixels

changedPixels = 0

takePicture = False

if (debugMode): # in debug mode, save a bitmap-file with marked changed pixels and with visible testarea-borders

debugimage = Image.new("RGB",(testWidth, testHeight))

debugim = debugimage.load()

for z in xrange(0, testAreaCount): # = xrange(0,1) with default-values = z will only have the value of 0 = only one scan-area = whole picture

for x in xrange(testBorders[z][0][0]-1, testBorders[z][0][1]): # = xrange(0,100) with default-values

for y in xrange(testBorders[z][1][0]-1, testBorders[z][1][1]): # = xrange(0,75) with default-values; testBorders are NOT zero-based, buffer1[x,y] are zero-based (0,0 is top left of image, testWidth-1,testHeight-1 is botton right)

if (debugMode):

debugim[x,y] = buffer2[x,y]

if ((x == testBorders[z][0][0]-1) or (x == testBorders[z][0][1]-1) or (y == testBorders[z][1][0]-1) or (y == testBorders[z][1][1]-1)):

# print "Border %s %s" % (x,y)

debugim[x,y] = (0, 0, 255) # in debug mode, mark all border pixel to blue

# Just check green channel as it's the highest quality channel

pixdiff = abs(buffer1[x,y][1] - buffer2[x,y][1])

if pixdiff > threshold:

changedPixels += 1

if (debugMode):

debugim[x,y] = (0, 255, 0) # in debug mode, mark all changed pixel to green

# Save an image if pixels changed

if (changedPixels > sensitivity):

takePicture = True # will shoot the photo later

if ((debugMode == False) and (changedPixels > sensitivity)):

break # break the y loop

if ((debugMode == False) and (changedPixels > sensitivity)):

break # break the x loop

if ((debugMode == False) and (changedPixels > sensitivity)):

break # break the z loop

if (debugMode):

debugimage.save(filepath + "/debug.bmp") # save debug image as bmp

print "debug.bmp saved, %s changed pixel" % changedPixels

# else:

# print "%s changed pixel" % changedPixels

# Check force capture

if forceCapture:

if time.time() - lastCapture > forceCaptureTime:

takePicture = True

if takePicture:

lastCapture = time.time()

saveImage(cameraSettings, saveWidth, saveHeight, saveQuality, diskSpaceToReserve)

# Swap comparison buffers

image1 = image2

buffer1 = buffer2