Motion detection code

From MoDe

The code is adapted from this snippet (http://bigbold.com/snippets/posts/show/636).

from appuifw import * from graphics import Image import camera, e32 from audio import *

1. import miso # don't dim the light

app.body = c = Canvas()

running = 1 def quit():

   global running
   running = 0

app.exit_key_handler=quit

def getdata(im, bpp=24):

   import struct, zlib
   im.save('D:\\pixels.png', bpp=bpp, compression='no')
   f = open('D:\\pixels.png', 'rb')
   f.seek(8 +8+13+4)
   chunk = []
   while 1:
       n = struct.unpack('>L', f.read(4))[0]
       if n==0: break  # 'IEND' chunk
       f.read(4) # 'IDAT'
       chunk.append(f.read(n))
       f.read(4)   # CRC
   f.close()
   return zlib.decompress(.join(chunk))  # '\x00' prefix each line

last1 = '\x00' * 930 # can be anything box = Image.new((30,30), 'L') # gray scale

snd_file = [u'c:\\system\\apps\\python\\my\\note1.wav',

           u'c:\\system\\apps\\python\\my\\note2.wav',
           u'c:\\system\\apps\\python\\my\\note3.wav',
           u'c:\\system\\apps\\python\\my\\note4.wav',
           u'c:\\system\\apps\\python\\my\\note5.wav',
           u'c:\\system\\apps\\python\\my\\note6.wav',
           u'c:\\system\\apps\\python\\my\\note7.wav',
           u'c:\\system\\apps\\python\\my\\note8.wav',
           u'c:\\system\\apps\\python\\my\\note9.wav',
           ]

my_id = query(u'enter number between 0 and 8',u'number',0) try:

   snd = Sound.open(snd_file[my_id])

except:

   note(u'could not find '+snd_file[my_id],u'info')
   quit()

while running:

   im = camera.take_photo('RGB12', (160,120))
   im.rectangle( [ (65,45),(95,75) ], 0xff0000)   # red outline
   box.blit(im, (65,45,95,75))
   data = getdata(box, 8)

   # check difference for motion
   pixdiff = 0
   for i in range(len(data)):
       if abs(ord(data[i])-ord(last1[i])) > 15:  # pix threshold 15/256
           pixdiff += 1
           if pixdiff > 90:    # img threshold 90/900
               snd.play()
               im = camera.take_photo('RGB12', (160,120))
               im.rectangle( [ (65,45),(95,75) ], 0xff0000)   # red outline
               box.blit(im, (65,45,95,75))
               data = getdata(box, 8)
               snd.stop()
               break           # motion detected
   last1 = data
   c.blit(im, (0,0), (8,12))   # show camera
   #miso.reset_inactivity_time()