How to draw rectangles along the tampered region of an image ?

Question

Anushka 2015-2-8

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https://ww2.mathworks.cn/matlabcentral/answers/176403-how-to-draw-rectangles-along-the-tampered-region-of-an-image

回答： Image Analyst 2015-2-8

I have already determined the blocks of an image which are tampered.I want to draw a box over around this blocks and show the same in original image.Can any one please suggest any method for the same.

for i=1:64

    if(abs(H(i)-Hm3(i))>1)
imshow(Block0(:,:,i);       %tampered block i
[x]=FirstPositionBlock(i,:); %coordinate values of the first pixel of tampered block
   end
end

If J is the original image how can i get the box drawn on the image corresponding to the tempered blocks of the image.

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Answer 1

Image Analyst 2015-2-8

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https://ww2.mathworks.cn/matlabcentral/answers/176403-how-to-draw-rectangles-along-the-tampered-region-of-an-image#answer_167320

在 MATLAB Online 中打开

Use rectangle():

rectangle('Position', [x(1), x(2), 32, 32]);

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Answer 2

Erik S. 2015-2-8

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https://ww2.mathworks.cn/matlabcentral/answers/176403-how-to-draw-rectangles-along-the-tampered-region-of-an-image#answer_167303

Hi You can use the function

annotation('rectangle',[x y w h])

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Anushka 2015-2-8

Thank you for your response.

I used the statement as you said but it showed the error

"Error using annotation (line 129) position values must be between 0 and 1"

The following was what I gave in my program

annotation('rectangle',[x(1) x(2) x(1)+32 x(2)+32]);

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Answer 3

Erik S. 2015-2-8

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https://ww2.mathworks.cn/matlabcentral/answers/176403-how-to-draw-rectangles-along-the-tampered-region-of-an-image#answer_167307

Hi, I just saw in the documentation that the inputs should be normalized. Try to divide x(1) width image width and x(2) with image height, same for rectangle width and height.

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Erik S. 2015-2-8

Hi,

Can you upload the file please and state the coordinates where you want the rectangle?

Anushka 2015-2-8

在 MATLAB Online 中打开

I used

 shapeInserter = vision.ShapeInserter;
   f=int32(x(1));
   g=int32(x(2));
    rectangle = [g f 32 32];
    J1 = step(shapeInserter, J1, rectangle);
and got small small rectangles around each block not an entire rectangle.

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