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Substitution of LSB of RGB component by other bits

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sangeeta
sangeeta 2013-4-16
评论： Vinsa 2014-6-4
I have extracted audio bits in a variable. These needs to be substituted in RGB components at various pixel positions. I have the pixel positions and 8 bit value of each RGB at that position. Want to know how last 2 LSB of, say, RED component can be replaced by first 2 bits of audio data.
Kindly share if a link is already available for same.
  2 个评论
sangeeta
sangeeta 2013-4-18
Let value of R component at position(x1,y1) is [10010000].
Audio data is [11010101......]
2 LSB of R = [00]
These needs to be replaced by first two bits of audio data[11]
So finally value of R at (x1,y1) becomes [10010011].
Is there any substitution/replace method available in Matlab? Kindly reply soon.
Vinsa
Vinsa 2014-6-4
i am doing steganography on line based cubism images..how this adaptive LSB substitution for smooth areas and two component lsb substitution for edge areas can be done? kindly give me reply.

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回答（1 个）

Walter Roberson
Walter Roberson 2013-4-18
bitset()
  2 个评论
sangeeta
sangeeta 2013-4-18
编辑：sangeeta 2013-4-18
Thanks Walter.
Kindly look into this:
r is red component value, say, 11000010
bits is bits to be replaced, last three.
firstAudio contain the three bits of audio data, say,001
if true
bits = 1:3;
a = dec2bin(bitset(bin2dec(r),bits,firstAudio));
end
I get:
a = 11000010
11000000
11000110
I want the replacement in the same byte, instead of 3 outputs, that is 'a' should be 11000001
Walter Roberson
Walter Roberson 2013-4-18
Use 3 bitset() calls.
Or if you are already using dec2bin storage for both r and firstAudio, then with no loops,
a = r;
a(end-2:end) = firstAudio(end-2:end);

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