maemo.org - Talk - N900 Sentry

I once made python script like this for my netbook. Ill try to find it and test how it works on n900.

I couldn't find my script, but my friend who tried to do the same thing at the time had his :)

It used use fswebcam, but because we don't have it on maemo, I switched to gstreamer, but it works really slowly, so any faster ideas are welcome :)

Code:

#! /usr/bin/env python

# -*- coding: utf-8 -*-



import subprocess

import math

import Image

import os



def imgdiff(A,B):

        Asize = A.size

        Bsize = B.size

        if(Asize != Bsize):

                B = B.resize(Asize)

        Apix = A.load()

        Bpix = B.load()

        diff = 0

        for x in range(0,Asize[0]/10):

                for y in range(0,Asize[1]/10):

                        diff += math.sqrt((Apix[x*10,y*10][0]-Bpix[x*10,y*10][0])**2 + (Apix[x*10,y*10][1]-Bpix[x*10,y*10][1])**2 + (Apix[x*10,y*10][1]-Bpix[x*10,y*10][1])**2)



        return 1 - (diff/(Asize[0]/10*Asize[1]/10))/(255.0*math.sqrt(3))



#Faster way on maemo?

def takePic():

        return subprocess.Popen("/usr/bin/gst-launch v4l2camsrc device=/dev/video0 num-buffers=1 \! video/x-raw-yuv,width=640,height=480  \! ffmpegcolorspace \! jpegenc \! filesink location=temp.jpg >> /dev/null", shell=True)



p = takePic()

sts = os.waitpid(p.pid, 0)

A = Image.open("temp.jpg")

p = takePic()



while True:

        if p.poll() == 0:

                B = A

                A = Image.open("temp.jpg")

                p = takePic()

                diff = imgdiff(A, B)

                if diff < 0.97:

                        print "Moves"