How to XOR the pixel values of image with a matrix containing binary numbers?

Hello., I would like to Xor the pixel values of image with a matrix having binary numbers.(i.e.,25*1 of binary numbers)

Till now i have pixel values read from a image.,

 I=imread('lena.jpg');
  c = [12 146 25 36 43];
  r = [104 156 29 12 89];
  pixels=impixel(I,c,r);

Waiting for ur response.,,Thankssssss in advance.,

[Min Min]

How to do xor operation with message bit and MSB bits of red channel in image steganography

[Image Analyst]

Did you see the code attached in my answer?

[Min Min]

I could not read the comments because the connection was bad at that time but now I can see your attachement code.

Thanks a lot sir

Answer 1

[Image Analyst]

I don't know what that means. Do you have 8 bit binary values and you want to do a bitwise XOR of each of those numbers with the binary image? So if you had 25 binary numbers, you'd have 25 images where each pixel of each image is XORed with the number in the list, and then you do this for all 25 images?

Or do you just want to extract the pixel values of the image at those 25 (row, column) locations from the image? So you'd have 25 pixel values?

[Anu Sharma]

what u stated in the 2nd statement is what i meant., i.e., to extract pixel values of image(25 locations) and then to perform xor operation with 25 binary numbers

[Image Analyst]

Why? It seems like you're doing both - combining the two things I suggested. Why do this crazy thing? I mean you could try this, but it won't work unless you fix it but I didn't want to put effort into fixing it because it doesn't seem like you're really want to do this.

grayImage = imread('cameraman.tif');
% Get 25 random locations.
r = [28    68    66    17    12    50    96    35    59    23    76    26    51    70    90    96    55    14    15    26    85    26    82    25    93];
c =[35    20    26    62    48    36    84    59    55    92    29    76    76    39    57     8     6    54    78    94    13    57    47     2    34];
% Get 25 random binary numbers between 0 and 255.
binaryNumbers = [42   203    80   135    43   154    68   167   176   191   115    22    59   233    39   211   138   255    20   113    28   246     2   198   209];
  
for k = 1 : length(r)
  gl = grayImage(r(k), c(k))
  a = dec2bin(num2str(gl) - '0')
  b = dec2bin(num2str(binaryNumbers(k)) - '0')
  % xor them, though it won't work if a and b are different lengths.
  xab = xor(a, b)
  out(k) = xor(a, b)
end

[Image Analyst]

I still don't have a clear idea of what you want to do. No one would want to take 25 randomly chosen pixels, and then XOR their pixel values with some random numbers. I don't see any point in that. What do you really want to do? Why don't you post your image and tell me what you want to measure in it?

[Image Analyst]

I still don't understand.

1. Your FV is a 1 by 5 array, assuming those variables are single numbers (scalars). So exactly what do you mean when you say "which is of 5*5 matrix"? Did you mean "which is a 5*5 matrix"? If so, how did you determine that. If you meant something else, then explain that also.
2. You can use imread() to read in an image.
3. It makes no sense to do a bitwise XOR of the image pixels with a feature vector. None. Not at all. Makes no sense whatsoever. It's a dead end. It's meaningless and useless. You're confused, or else you're not explaining what you really want to do. I don't know how to say it any more.

[Image Analyst]

You should ask your guide for help because I think that you didn't correctly grasp what he tried to tell you or you're not conveying it to me correctly or you're doing something weird like trying to use steganography to hide a feature vector in an image for some strange reason. He would know more precisely the steps you should take.

[Image Analyst]

You can use steganography to hide data in an image. I don't have any tutorial for you on that topic but you can do a web search and come up with lots of information on it. I just suggested it and now you're requesting it. I'm not sure that you need it so I'm not going to spend time programming up something for you that you may not end up needing. I've attached a watermarking demo that I already have, for whatever that's worth. It's sort of related. Watermarking puts images into other images, and they can be hidden or visible.