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Trevor Linton

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13 Aug 2008 Tensor Voting Framework Implementation of the 2D medioni tensor framework Author: Trevor Linton image analysis, tensor voting, gerard medioni, 2d, image processing 44 11
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06 Apr 2009 Tensor Voting Framework Implementation of the 2D medioni tensor framework Author: Trevor Linton

Hi Ben,

You're right the example code that reads in the edge files is wrong, however these were just used for examples.

The actual tensor voting code is correct however. Let me know if you notice any problems, feel free to contact me (tlinton@cs.utah.edu).

-t

28 Oct 2008 Tensor Voting Framework Implementation of the 2D medioni tensor framework Author: Trevor Linton

I apologize, the sparse field simply converts points to initial ball tensors, the refined is the ball voting and calc_vote_stick is the actual stick voting.

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29 May 2013 Tensor Voting Framework Implementation of the 2D medioni tensor framework Author: Trevor Linton Widya Wirya

Please help me ,How to create *.edge from image file(gif,jpeg,bmp) thanks for help

07 Mar 2013 Tensor Voting Framework Implementation of the 2D medioni tensor framework Author: Trevor Linton Le

Your code is help me a lot to understand TV.While I'm reading the book you referenced --Topics in Computer Vision,I'm confused by a question: it mentioned an equation 5.4,is about to say "the first order voting field for a unit stick voter aligned with the z-axis": SFO(d, θ) = DF(s,κ,σ)[−cos2θ)
−sin(2θ)]
,but how does ti reflected in your code?
Could you help me?

21 Aug 2011 Tensor Voting Framework Implementation of the 2D medioni tensor framework Author: Trevor Linton Koushik

In read_dot_edge_file.m file the edge input is converted to tensor value using the following codes. My question is what is the theory behind this. CAN ANYBODY HELP???

h = max(buf(:,1));
w = max(buf(:,2));
T = zeros(h,w,2,2);
for i=1:n
x = cos(buf(i,3)*pi/180 + 90*pi/180);
y = sin(buf(i,3)*pi/180 + 90*pi/180);
T(h+1-buf(i,1),buf(i,2),1,1) = x^2;
T(h+1-buf(i,1),buf(i,2),1,2) = x*y;
T(h+1-buf(i,1),buf(i,2),2,1) = x*y;
T(h+1-buf(i,1),buf(i,2),2,2) = y^2;
end

18 Aug 2011 Tensor Voting Framework Implementation of the 2D medioni tensor framework Author: Trevor Linton Chris Walker

Hi,
In your convert_tensor_ev function, you have determine eigenvalues and eigenvectors using these commands:
% trace/2
t = (K11+K22)/2;

a = K11 - t;
b = K12;

ab2 = sqrt(a.^2+b.^2);
o3 = ab2 + t;
o4 = -ab2 + t;

theta = atan2( ab2-a, b );

where does the maths that underlies these commands come from?. I typed the following into Wolfram Alpha:
l1*{{cos(t)*cos(t),cos(t)*sin(t)},{cos(t)*sin(t),sin(t)*sin(t)}}+l2*{{sin(t)*sin(t),-cos(t)*sin(t)},{-cos(t)*sin(t),cos(t)*cos(t)}}

and I get different answers for the eigenvalues and eigenvectors.
Any help would be appreciated.
thanks
Chris Walker

26 Jul 2010 Tensor Voting Framework Implementation of the 2D medioni tensor framework Author: Trevor Linton Dev Arora

Hi, I am not able to understand the concept how an image is converted into Tensor. Can anybody please explain me.
Thanks

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