Thread: eMonitor
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Old 04-24-2012, 05:08 PM   #37
jmseight
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Posts: 130
Karma: 10000
Join Date: Mar 2012
Device: Kindle 3G, Kindle Touch 3G, iRiver Story HD, Sony Reader
eMonitor with Support for Dithering

Hi All,

Please find the enclosed version using wxpython with support for Dithering with geekmaster's formula 42 translated to python.

The screen size can be reduced to 800x600 for Kindle easily.

The dithered variable is set to True or False to turn on or off.

Dithered images are saved as png - for smaller size
Grayscale images are saved as jpg - for smaller size

Thanks,
James

Code:
#!/usr/bin/python
#eMonitor
#Version 3 modified by jmseight for Kindle/Story (4-25-2012)
#  Rotate screen 90 deg
#  Support Dithering if turned on (no flash on videos)
#    support cropping of dithering table
#    saves as png for dithered
#    saves as jpeg for grayscale
#  Reduce quality for faster load
#  Uses GeekMaster's Dithering Formula (MIT license)
#  Set to Story HD resolution

#based on eMonitor by Kranu
#Version 2 (9-1-2011)

#Tested on Windows 7 x64, Python 2.7.2, wxPython 2.8
#For more information, see: http://goo.gl/rJoLp

#BEGIN SETUP

#HTTP Server
port=8000              #port of http server (http://127.0.0.1:8000/)

#capture region
#l,t=(1680,1050-800)
l,t=(0,0)              #left and right offset from primary monitor
w,h=(1024,768)          #width and height of capture region
fn ='shot.png'         #file name of screenshot
quality = "50"

dt = [
    3,129,34,160,10,136,42,168,192,66,223,97,200,73,231,105,50,
    176,18,144,58,184,26,152,239,113,207,81,247,121,215,89,14,
    140,46,180,7,133,38,164,203,77,235,109,196,70,227,101,62,188,
    30,156,54,180,22,148,251,125,219,93,243,117,211,85 ] # 0-255 dither table

white = 255     #white threshold
black = 0       #black threshold
dithered = True  #dithered or not

#//END SETUP

import wx,socket
from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer

class serv(BaseHTTPRequestHandler):
  def do_GET(self):
    self.send_response(200)
    if self.path.startswith('/'+fn):
      self.send_header('Content-type','image/jpeg')
      self.end_headers()
  
      app=wx.PySimpleApp()
      context=wx.ScreenDC()
      bitmap=wx.EmptyBitmap(w, h, -1)
 
      memory=wx.MemoryDC()
      memory.SelectObject(bitmap)
      memory.Blit(0, 0, w, h, context, l, t)
      memory.SelectObject(wx.NullBitmap)
 
      image=wx.ImageFromBitmap(bitmap)
      data=list(image.GetData())

#      for i in xrange(0,len(data),3):
#        data[i]=data[i+1]=data[i+2]=chr(int(0.2989*float(ord(data[i]))+0.5870*float(ord(data[i+1]))+0.1140*float(ord(data[i+2]))))

      i=0

      if dithered:
        for y in xrange(0,h-1,1):
          for x in xrange(0,w-1,1):
#            i = (y*w + x)*3
#            j = ((y&7)<<3)|x&7
#            intensity = int((298*ord(data[i])+587*ord(data[i+1])+114*ord(data[i+2]))/1000)
            if dt[((y&7)<<3)|x&7] < (ord(data[i])+(ord(data[i+1])<<1)+ord(data[i+2]))>>2:
              data[i] = '\xff'
            else:
              data[i] = '\x00'
            i=i+3
      else:
        for y in xrange(0,h-1,1):
          for x in xrange(0,w-1,1):
#            i = (y*w + x)*3
#            j = ((y&7)<<3)|x&7
#            intensity = int((298*ord(data[i])+587*ord(data[i+1])+114*ord(data[i+2]))/1000)
            data[i] = chr((ord(data[i])+(ord(data[i+1])<<1)+ord(data[i+2]))>>2)
            i=i+3

      image.SetData("".join(data))
      image = image.Rotate90(False)

      if dithered:
        image.SetOption(wx.IMAGE_OPTION_PNG_FORMAT, str(wx.PNG_TYPE_GREY_RED))
        image.SetOption(wx.IMAGE_OPTION_PNG_BITDEPTH, "8")
        image.SaveFile(fn,wx.BITMAP_TYPE_PNG)
      else:
        image.SetOption("quality", quality)
        image.SaveFile(fn,wx.BITMAP_TYPE_JPEG)

      f=open(fn,'rb')
      self.wfile.write(f.read())
    else:
      self.send_header('Content-type','text/html')
      self.end_headers()
      self.wfile.write('<!doctype html>'\
        '<html lang="en">'\
        '<head>'\
        '<title>eMonitor by Kranu</title>'\
        '</head>'\
        '<body style="margin:0px;">'\
        '<img id="pic" src="'+fn+'" style="float:left;width:100%;height:100%;">'\
        '<script type="text/javascript">'\
        'document.getElementById("pic").onload=function() {'\
        '  document.getElementById("pic").src="'+fn+'?"+(new Date()).getTime();'\
        '}'\
        '</script>'\
        '</body>'\
        '</html>')
try:
  print 'eMonitor by jmseight (based on Kranu)'

  for j in xrange(0, len(dt)-1, 1):
    if dt[j] < black:
      dt[j] = black
    if dt[j] > white:
      dt[j] = white

  #Amazon's website is used here for its reliablity. Feel free to change it.
  s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
  s.connect(("amazon.com",80))

  print 'Starting.. ',
  server=HTTPServer(('',port),serv)
  print 'Press Ctrl+C to stop'
  print

  print 'On your Kindle/Story, visit http://'+s.getsockname()[0]+':'+str(port)+'/'

  server.serve_forever()
except KeyboardInterrupt:
  print 'Stopping.. ',
  server.socket.close()
  print 'Have a nice day!'
Attached Files
File Type: zip webserver_v3.zip (2.1 KB, 82 views)
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