84648488
 Chunk
reverted.
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
__author__ = 'chunk'
import numpy as np
import mjsteg
import jpegObj
from jpegObj import base
from common import *
timer = Timer()
sample = [[7, 12, 14, -12, 1, 0, -1, 0],
[6, 5, -10, 0, 6, 0, 0, 0],
[0, 6, -5, 4, 0, -1, 0, 0],
[0, -3, 0, 1, -1, 0, 0, 0],
[-3, 5, 0, 0, 0, 0, 0, 0],
[2, -1, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0]]
sample_key = [46812L, 20559L, 31360L, 16681L, 27536L, 39553L, 5427L, 63029L, 56572L, 36476L, 25695L, 61908L, 63014L,
5908L, 59816L, 56765L]
def test_setblocks():
"""
wholewise
"""
imb = jpegObj.Jpeg("res/test4.jpg")
block = imb.getCoefBlock(channel='Y', loc=(-1, 2))
print block
imb.setCoefMatrix(np.array([[0] * 800 for i in range(600)]), channel='Y')
block = imb.getCoefBlock(channel='Y', loc=(-1, 2))
print block
imb.Jwrite("res/test4.jpg")
ima = jpegObj.Jpeg("res/test3.jpg")
imb = jpegObj.Jpeg("res/test4.jpg")
jpegObj.diffblocks(ima, imb)
def test_setblocks2():
"""
wholewises
"""
ima = jpegObj.Jpeg("res/test3.jpg")
imb = jpegObj.Jpeg("res/test4.jpg")
block = ima.getCoefBlock(channel='Y', loc=(-1, 2))
print block
block = imb.getCoefBlock(channel='Y', loc=(-1, 2))
print block
imb.setCoefBlocks(ima.getCoefBlocks())
block = imb.getCoefBlock(channel='Y', loc=(-1, 2))
print block
imb.Jwrite("res/test4.jpg")
ima = jpegObj.Jpeg("res/test3.jpg")
imb = jpegObj.Jpeg("res/test4.jpg")
jpegObj.diffblocks(ima, imb)
def test_setblock():
"""
blockwise
"""
imb = jpegObj.Jpeg("res/test4.jpg")
block = imb.getCoefBlock(channel='Y', loc=(0, 1))
print block
# print b.setCoefBlock(np.array([[27] + [0] * 7] + [[0] * 8 for i in range(7)]), loc=(0, 1))
imb.setCoefBlock(np.array(sample), loc=(0, 1))
blocks1 = imb.getCoefBlock(channel='Y', loc=(0, 1))
print blocks1
blocks2 = imb.Jgetblock(1, 0, 0)
block_to_show = np.frombuffer(blocks2, dtype=np.int16, count=-1, offset=0).reshape(8, 8)
print block_to_show
jpegObj.diffblock(blocks1, block_to_show)
def test_split():
imb = jpegObj.Jpeg("res/test3.jpg")
c = imb.getCoefMatrix(channel='Y')
print type(c[0, 0])
d = c.ravel()
c1 = np.array([np.split(arr, arr.shape[1] / 8, axis=1) for arr in np.split(c, c.shape[0] / 8)])
c2 = np.array([np.hsplit(arr, arr.shape[1] / 8) for arr in np.vsplit(c, c.shape[0] / 8)])
c3 = imb.getCoefBlocks()
print c1.shape, c2.shape
if np.array_equal(c1, c2) and np.array_equal(c1, c3):
print("blocks match")
def _convert_bits(hid_data):
hid_data_bits = [map(int, '{0:08b}'.format(byte)) for byte in hid_data]
return np.array(hid_data_bits).ravel()
def test_rawfile():
raw = [0, 0, 0, 0] + np.fromfile("res/test4.jpg", np.uint8).tolist()
raw_size = len(raw)
print raw_size
for i in xrange(4):
raw[i] = raw_size % 256
raw_size /= 256
raw = np.array(raw)
print raw.shape, raw
# print raw.size
# print bytes2bits(raw)
def test_bitbyte():
timer.mark()
raw = np.fromfile("res/test4.jpg", np.uint8)
timer.report()
print raw
bitsraw = bytes2bits(raw)
# bitsraw = bitsraw[:24]
timer.report()
print bitsraw
bytesraw = bits2bytes(bitsraw)
timer.report()
print bytesraw
def test_iter():
imb = jpegObj.Jpeg("res/test4.jpg")
blocks = imb.getCoefBlocks(channel='Y')
cnt = 0
for x in np.nditer(blocks, op_flags=['readwrite']):
if x == 0:
continue
x[...] = 2
print x
for x in np.nditer(blocks):
if x == 0:
continue
cnt += 1
print x
print cnt
if __name__ == '__main__':
# timer.mark()
# test_setblock()
# timer.report()
#
# timer.mark()
# test_setblocks()
# timer.report()
# test_split()
# test_iter()
# test_rawfile()
# test_setblocks2()
# test_bitbyte()
ima = jpegObj.Jpeg("res/test3.jpg", key=sample_key)
# imb = jpegObj.Jpeg("res/new.jpg",key=sample_key)
imc = jpegObj.Jpeg("res/steged.jpg", key=sample_key)
print ima.Jgetcompdim(0)
print ima.getkey(), imc.getkey()
print jpegObj.diffblocks(ima, imc)
# c1 = ima.getCoefBlocks()
# c2 = imb.getCoefBlocks()
#
# # print c1[0],c2[0]
# s1 = imb.getsignal(channel='Y')
# s2 = ima.getsignal(channel='Y')
# imb.setsignal(s2,channel='Y')
# imb.Jwrite('res/new.jpg')
# print base.acMask(8,16)
# mmask = base.acMaskBlock
# print mmask
# sample = np.array(sample)[mmask]
# print np.hstack([[],sample])
pass
|