1f1943eb
 qijun
initial commit
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__author__ = 'chunk'
import numpy as np
import mjsteg
import jpegObj
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]]
def diffblock(c1, c2):
diff = False
if np.array_equal(c1, c2):
print("blocks match")
else:
print("blocks not match")
diff = True
return diff
def diffblocks(a, b):
diff = False
for comp in range(a.image_components):
xmax, ymax = a.Jgetcompdim(comp)
for y in range(ymax):
for x in range(xmax):
if a.Jgetblock(x, y, comp) != b.Jgetblock(x, y, comp):
print("blocks({},{}) in component {} not match".format(y, x, comp))
diff = True
return diff
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")
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")
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
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()
pass
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