In [2]:
import sdm as sdmlib
import matplotlib.pyplot as plt
from PIL import Image, ImageDraw, ImageFont
import urllib, cStringIO
import random
from IPython.core.display import display, Image as IPythonImage
%matplotlib inline
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width = 30
height = 30
noise_flip = True
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def gen_img(letter='A'):
img = Image.new('RGBA', (width, height), (255, 255, 255))
font = ImageFont.truetype('Arial.ttf', 30)
draw = ImageDraw.Draw(img)
w, h = draw.textsize(letter, font=font)
top = (height-w)//2
left = (width-h)//2 if h <= 30 else 30-2-h
draw.text((top, left), letter, (0, 0, 0), font=font)
return img
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def gen_noise_add(img, p=0.15, flip=False):
img2 = img.copy()
draw = ImageDraw.Draw(img2)
for py in xrange(height):
for px in xrange(width):
if random.random() < p:
if flip:
pixel = img.getpixel((px, py))
value = sum([int(x/255+0.5) for x in pixel[:3]])//3
assert value == 0 or value == 1
value = (1 - value)*255
draw.point((px, py), fill=(value, value, value))
else:
draw.point((px, py), fill=(0, 0, 0))
return img2
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img = gen_img();
img2 = gen_noise_add(img, flip=noise_flip)
plt.subplot(1, 2, 1)
plt.imshow(img)
plt.subplot(1, 2, 2)
plt.imshow(img2);
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def to_bitstring(img):
v = []
bs = sdmlib.Bitstring.init_ones(1000)
for py in xrange(height):
for px in xrange(width):
pixel = img.getpixel((px, py))
value = sum([int(x/255+0.5) for x in pixel[:3]])//3
assert value == 0 or value == 1
idx = px+width*py
assert idx >= 0 and idx < 1000, 'Ops {} {} {}'.format(x, y, idx)
bs.set_bit(idx, value)
v.append(value)
v2 = [bs.get_bit(i) for i in xrange(height*width)]
assert v == v2
return bs
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def to_img(bs):
img = Image.new('RGBA', (30, 30), (255, 255, 255))
draw = ImageDraw.Draw(img)
for py in xrange(height):
for px in xrange(width):
idx = px+width*py
assert idx >= 0 and idx < 1000, 'Ops {} {} {}'.format(x, y, idx)
x = 255*bs.get_bit(idx)
draw.point((px, py), fill=(x, x, x))
return img
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bits = 1000
sample = 1000000
scanner_type = sdmlib.SDM_SCANNER_OPENCL
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address_space = sdmlib.AddressSpace.init_random(bits, sample)
counter = sdmlib.Counter.init_zero(bits, sample)
sdm = sdmlib.SDM(address_space, counter, 451, scanner_type)
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sdm.write_random_bitstrings(500)
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def fill_memory(letter, p=0.15, n=100):
cols = 15
rows = n//cols + 1
plt.figure(figsize=(20,10))
for i in xrange(n):
img = gen_img(letter=letter);
img2 = gen_noise_add(img, flip=noise_flip)
#display(img2)
plt.subplot(rows, cols, i+1)
plt.imshow(img2)
bs = to_bitstring(img2)
sdm.write(bs, bs)
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fill_memory('A')
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def read(letter, n=6, p=0.25):
n = 6
cols = 7
rows = n//cols + 1
plt.figure(figsize=(20,10))
img = gen_img(letter=letter);
img2 = gen_noise_add(img, p=p, flip=noise_flip)
plt.subplot(rows, cols, 1)
plt.imshow(img2)
for i in xrange(n):
bs2 = to_bitstring(img2)
bs3 = sdm.read(bs2)
img3 = to_img(bs3)
plt.subplot(rows, cols, i+2)
plt.imshow(img3)
img2 = img3
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read('W', p=0.)
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read('I', p=0.42)
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v = []
for p in [0, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45]:
img = gen_img(letter='A');
img2 = gen_noise_add(img, p=p, flip=noise_flip)
v.append(img2)
fig = plt.figure(figsize=(8, 6), dpi=200)
for i, img in enumerate(v):
plt.subplot(1, 10, i+1)
plt.imshow(img, label=str(p))
plt.subplots_adjust(bottom=0.1, right=2.0, top=0.9)
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