Comments and Ratings

Thank you very much.

sanjay,
The most probable cause might be that you invoked the function using inappropriate parameters. The function allocate a 3D matrix of size [size(im,1)+maxR, size(im,2)+maxR, maxR-minR+1], where minR and maxR are the minimal and maximal radii of circles you want to detect, respectively. You may want to check if the size of your input image or the values of minR and maxR are really huge.

Dear Sir,
I need your help in the following:
" image MUST first be normalized w.r.t. scale and translation i.e. centroid of image is at image center, and image has geometrical moment m00 = fixed number/scale."

Could you please tell me, if the "imnorm.m" do the above description. so that I can use it as black box.

I'm appreciated for your help and support.

Sorry, I've made ma mistake

if (nargin >=3 || nargin <= 6)
    
    if nargin==3
        thresh = 0.33; % One third of the perimeter
        delta = 12; % Each element in (x y r) may deviate approx. 4 pixels
        edgeim = edge(im, 'canny', [0.15 0.2]);
    end
    
    if nargin==4
        edgeim = edge(im, 'canny', [0.15 0.2]);
        delta = 12;
    end
    
    if (nargin==5)
        edgeim = edge(im, 'canny', canny_th);
        delta = 12;
    end
    
    if (nargin==6)
       edgeim = edge(im, 'canny', canny_th,sigma);
       delta=12;
    end
    if (nargin == 7)
         edgeim = edge(im, 'canny', canny_th,sigma);
    end
end

if minR<0 || maxR<0 || minR>maxR || thresh<0 || thresh>1 || delta<0 || canny_th <0 || canny_th >1
  disp('Input conditions: 0<minR, 0<maxR, minR<=maxR, 0<thresh<=1, 0<delta');
  return;
end

Also , I would ask if anyone use "benchmark" to evaluate watermarking algorithm by matalb code.

I need to know, how to use it ?

Nice function. Code is well documented and clearly written.
One suggestion is to follow the example of the peaks() function: if no output argument is given, then create a figure and display the image. If it's used with an output argument, assume the user is embedding the function in their own code, and doesn't want a figure to come up automatically.

There arises a white rectangular frame in the image after normalization. how to get rid of that???

please suggest

Hello. My name is Manuel Cedillo Hernández. I´m student from México City. Your paper "Digital Watermarking Robust to Geometric Distortions" is very interesting. My question in this paper is: How to constructed the watermark ?. The part of CDMA is clear, but the part of convert the signal 1-D in 2-D is not clear. If it is possible, they could clarify this part to me. Thanks.