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anna ann


Active since 2016

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Calculation of psnr value in RGB image. I have calculated psnr using this code. But the result obtained is a complex number. What should be the error??
if true function PSNR = psnrgb(I,W) [m,n,p] = size(I); [h,w,q] = size(W); if m ~= h || n ~= w || p~=q error('...

7 years ago | 1 answer | 0

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Is there any encryption algorithm other than XOR , which works on bitwise??
I require an encryption algorithm for images such that it will operate bitwise on pixels. Xor is worked for it. Any other metho...

7 years ago | 1 answer | 0

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Question


Uncompressed 512x512 image data base
Hi i am doing a RDH algorithm. Now some data base contains uncompressed images of size 512x512 is required.(eg: Boss base , PASC...

7 years ago | 0 answers | 0

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What are the parameters that can be used to find the most information carrying channel in color image??
Just like entropy what are other parameters which we can used to measure the information content in a color channel??

8 years ago | 1 answer | 0

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Question


Can we find out which channel is smooth based on inter pixel value difference in RGB image???
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8 years ago | 0 answers | 0

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Question


LSB substitution by verifying pixel values odd or even
for embedding a message b, keep the pixel value odd for bit 0 and even for bit 1. i have developed code in this manner. But outp...

8 years ago | 0 answers | 0

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how can we show the hidden data in stego image by its position???because stego image is a large matrix???
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8 years ago | 1 answer | 0

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Question


color image encryption; I have tried this code for color image encryption. the same code is tried for decryption but error occurs,because dimension exceeds!!
I=double(imread('baboon .tiff')); randomSequence = round(rand(512,512)*255); % Encryption by bitxor with psuedo random ...

8 years ago | 0 answers | 0

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Question


how can i modify this code to encrypt an image?what is an encryption key?how can i include this key to generate pseudo random sequence?
I=double(imread('filename')); [m n]=size(I); for i=1:m for j=1:n r=randi(m,n,255) end end p=xor(I,r)

8 years ago | 0 answers | 0

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Question


How a pseudo random sequence r of size equals to a given image can be created using a key to encrypt the image??
<</matlabcentral/answers/uploaded_files/63367/matwork.JPG>>

8 years ago | 0 answers | 0

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what is the difference between zero and peak point in a histogram
histogram shift method

8 years ago | 1 answer | 0

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sparse representation of colour image
How colour image can represented using patch level sparse representation??Is there any matlab code available??

8 years ago | 0 answers | 0

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Question


reversible data hiding in encrypted colour image
Someone plz send matlab code for reversible data hiding in encrypted colour images!!

8 years ago | 0 answers | 0

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Question


Iam doing a project on reversible data hiding in encrypted color images using sparse representation. Plz suggest me how should i start??Give me a working procedure !!
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8 years ago | 0 answers | 0

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Question


i want a single algorithm able to process both color image and gray scale image. so separating into rgb channels and analysing its values, can algorithm distinguish color and gray images??
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8 years ago | 1 answer | 0

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Question


color image can be divided into individual color channels. if i give a gray input to the same program what will be the output??
a=imread(a.jpg) R=a(:,:,1) G=a(:,:,2) B=a(:,:,3) %if a= a gray image what will happen??

8 years ago | 1 answer | 0

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Question


what is lsb planes of an image and what is its significance?
im = imread('pout.tif'); bit1 = bitget(im, 1); % lsb for example imshow(bit1, []

8 years ago | 1 answer | 1

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