This commit is contained in:
Roman Hergenreder 2018-12-05 18:00:28 +01:00
parent d63b8c7736
commit 1b071a46e8
4 changed files with 146 additions and 0 deletions

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#!/usr/bin/python
from PIL import Image
from qrtools import QR
import itertools
img = Image.open('QR3C.png')
pixels_orig = img.load()
(w,h)=img.size
outimg = Image.new( 'RGB', (23,23), "white")
pixels_out = outimg.load()
for i in range(0,h,6):
for j in range(0,w,6):
(r,g,b) = pixels_orig[j,i]
if((r,g,b)==(255,255,255)):
pixels_out[j/13,i/13]=(255,255,255)
elif((r,g,b)==(0,0,0) or r>0 ):
pixels_out[j/13,i/13]=(0,0,0)
# bruteforce missing section until readable
count=0
for i in itertools.product('01', repeat=60):
count+=1
if count%1000 ==0:
print count
for x in range(1,12):
for y in range (10,14):
if( i[((y-10)%4)*11 + x] == '0' ):
pixels_out[x,y]=(0,0,0)
outimg=outimg.resize((300,300))
outimg.save("dec17_out.png","png")
# read qr code
nugget=''
myCode = QR(filename="dec17_out.png")
if myCode.decode():
nugget=myCode.data_to_string()
print nugget
break
#else:
# print "could not decode"
#break

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#!/usr/bin/python
from PIL import Image
def invert(value):
return ''.join(["1" if x == "0" else "0" for x in value])
# Load Image
im = Image.open('QR3C_cropped.png')
# im.crop((33, 34, 264, 265)).save("QR3C_cropped.png")
pix = im.load()
tiles = 21
tileSize = im.size[0] // tiles
version = (tiles - 17) // 4
data = [[0 for x in range(tiles)] for y in range(tiles)]
print("tiles=%d tileSize=%d version=%d" % (tiles, tileSize, version))
for x in range(tiles):
for y in range(tiles):
x_mid = x * tileSize + 0.5 * tileSize
y_mid = y * tileSize + 0.5 * tileSize
color = pix[x_mid, y_mid]
# print(x, y, x_mid, y_mid, color)
data[x][y] = invert("%d%d%d" % ( color[0] // 255, color[1] // 255, color[2] // 255 ))
# print(data)
def blackWhiteValue(string):
new_value = ""
if len(string) % 3 != 0:
print("Cannot return black white value of", string)
return new_value
for i in range(len(string) // 3):
new_value += string[i * 3]
return new_value
mask1 = [data[8][18], data[8][17], data[8][16]]
mask2 = [data[2][8], data[3][8], data[4][8]]
if mask1 != mask2:
print("masks do not match")
exit()
# mask = [mask1[0][0] + mask1[1][0] + mask[2][0],]
mask = [''.join(mask1[i][j] for i in range(3)) for j in range(3)]
print("Mask:", mask)
def apply_mask(x, y, bit, mask):
doInvert = False
if mask == "111":
doInvert = x % 3 == 0
elif mask == "110":
doInvert = (x + y) % 3 == 0
elif mask == "101":
doInvert = (x + y) % 2 == 0
elif mask == "100":
doInvert = y % 2 == 0
elif mask == "000":
doInvert = ((x*y) % 2) + ((x + y) % 3) == 0
return invert(bit) if doInvert else bit
def get_masked_value(x, y):
return ''.join([apply_mask(x, y, data[x][y][i], mask[i]) for i in range(3)])
def read_block(x, y, orientation):
indizes = []
if orientation == "UP":
indizes = [[0,0], [-1,0], [0,-1], [-1,-1], [0,-2], [-1,-2], [0, -3], [-1, -3]]
elif orientation == "LEFT":
indizes = [[0,0], [-1,0], [0,-1], [-1,-1], [-2,-1], [-3,-1], [-2, 0], [-3, 0]]
return ''.join([get_masked_value(x + offset[0], y + offset[1]) for offset in reversed(indizes)])
encoding = blackWhiteValue(data[20][20] + data[19][20] + data[20][19] + data[19][19])
print("Encoding:", encoding)
# Alphanumeric? 11 bits per 2 character
# for y in range(tiles):
# print(''.join(data[y]))
block1 = read_block(20, 14, "UP")
block2 = read_block(20, 10, "LEFT")
print(block1, len(block1))
print(block2, len(block2))