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#!/usr/bin/env python
# * Copyright 2011 Alistair Buxton <a.j.buxton@gmail.com>
# *
# * License: This program is free software; you can redistribute it and/or
# * modify it under the terms of the GNU General Public License as published
# * by the Free Software Foundation; either version 3 of the License, or (at
# * your option) any later version. This program is distributed in the hope
# * that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
# * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# * GNU General Public License for more details.
# This is the main data analyser.
import sys
import numpy as np
from scipy.interpolate import interp1d
from scipy.ndimage import gaussian_filter1d as gauss
from scipy.optimize import fminbound
import pylab
from util import paritybytes, setbyte, normalise, hammbytes, allbytes, mrag, notzero
import config
import time
import printer
from vbi import Vbi
import guessview
def process_file(filename):
ans = []
try:
f = file(filename).read()
for line in range(32):
offset = line*2048
vbiraw = np.array(np.fromstring(f[offset:offset+2048], dtype=np.uint8), dtype=np.float32)
for tl in np.arange(1.05,1.2,0.05):
for th in np.arange(2.1,2.4,0.05):
for g in np.arange(1.1,5.2,1.0):
for go in np.arange(1.1,5.2,1.0):
#thresh_low=1.15 thresh_high=2.10 gauss_sd=1.10 gauss_sd_offset=1.10
v = Vbi(vbiraw, thresh_low=tl, thresh_high=th, gauss_sd=g, gauss_sd_offset=go)
tmp = v.find_offset_and_scale()
if tmp:
packet = v.deconvolve()
guessview.draw(vbiraw, v.g.convolved*256)
print printer.do_print(packet), "thresh_low=%1.2f thresh_high=%1.2f gauss_sd=%1.2f gauss_sd_offset=%1.2f" % (tl, th, g, go), line
else:
packet = None
print "no teletext in line", line
except IOError:
pass
return (filename, ans)
if __name__ == '__main__':
guessview.main()
#do_file('data/0022/vbi/00171104.vbi')
process_file(sys.argv[1])
#do_file('data/0022/vbi/00171106.vbi')
#do_file('data/0022/vbi/00171107.vbi')
#do_file('data/0022/vbi/00171108.vbi')
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