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# Youssra

### Mohemmed Ben Abdellah University

2015 이후 활성

Master Degree

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질문

How to implement ABC algorithm for image watermarking?
Hello, I'm working on image watermarking, and I'm trying to use ABC (Artifical Bee Colony) algorithm to optimize scaling facto...

4년 이상 전 | 답변 수: 1 | 0

### 1

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Why the division of two positive values gives negative value?
Hello,I'm using the following code to find a positive factor: [U S V] = svd(image, 'econ'); % calculate the SVD of the imag...

5년 이상 전 | 답변 수: 1 | 0

### 1

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How to choose non sensitive coefficients for watermarking?
Hello, I'm working on image watermarking, I'm working with DWT and SVD and I want to embed a watermark in some coefficients that...

5년 이상 전 | 답변 수: 0 | 0

### 0

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Convert binary values to a decimal matrix
Hello, Suppose that I have a matrix a= [1 3; 4 2], I convert this matrix to binary format using this code: a=magic(2...

약 6년 전 | 답변 수: 1 | 0

### 1

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convert a binary image to RGB color space
Hello, I have RGB image that I converted to binary to do some processing and I want to reconvert it back to its original color R...

6년 이상 전 | 답변 수: 2 | 0

### 2

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Getting many outputs using blockproc
I want to apply SVD for each 4*4 blocks using the "blockproc" and get 3 outputs: U, S and V so I can reconstract all blocks toge...

6년 이상 전 | 답변 수: 3 | 0

### 3

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how to detect a watermark
Hello, How do we know if an image is watermarked? Is there any function helps us to detect a waetermak before extracting it? ...

6년 이상 전 | 답변 수: 0 | 0

### 0

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Problem with Watermarking in HSV color space
I'm trying to apply a DWT-SVD watermaking in HSV color space, but the final watermarked image is defenitely different than the o...

6년 이상 전 | 답변 수: 0 | 0

### 0

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질문

how to control the position of an image inside another one?
Hi, I need your help please. I'm working in Matlab and I have tow images one with size 256*256 and the other one with size 64*6...

6년 이상 전 | 답변 수: 2 | 0

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