Community Profile

# Anton Semechko

### University of Toronto

58 total contributions since 2010

PhD student
Professional Interests: Signal/medical image processing, computational anatomy and biomechanics

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Submitted

Compute exact rigid-body parameters of objects represented by triangular surface meshes
Compute exact rigid body parameters of closed triangular surface meshes using divergence theorem

Submitted

Suite of functions to perform uniform sampling of a sphere
Set of functions to perform approximately uniform sampling/decomposition of the spherical domain

Submitted

Exact minimum bounding spheres/circles
Compute exact or approximate minimum bounding spheres/circles

Question

Setting 'FaceAlpha'<1 for a patch object causes x- and y- axes of the plot to dissapear. Why and how can this be corrected?
Hello everyone, have any of you ever plotted a 2D patch object and noticed that upon altering its 'FaceAlpha' value below 1, ...

2 years ago | 1 Answers | 0

### 1

Submitted

Fast segmentation of N-dimensional grayscale images
Partition N-D grayscale image into c classes using efficient C-means and fuzzy C-means clustering

Responded

Re: No help from "beep off"
In case you are running MatLab on Vista, this is how you can disable the annoying beep coming from the system speakers: http:/...

4 years ago | 33166 views

Dividing a triangle into equal parts
Suppose you have a triangle defined by the vertices A, B and C. To subdivide this triangle into n triangles of equal area you ca...

4 years ago | 0

Point inside triangle(s)?
Hi Sven, I have encountered this problem many times in the past. I am aware of at least two approaches to solve it. The first...

4 years ago | 1

Solved

Is my wife right?
Regardless of input, output the string 'yes'.

4 years ago

Solved

Select every other element of a vector
Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

4 years ago

Solved

Determine if input is odd
Given the input n, return true if n is odd or false if n is even.

4 years ago

Solved

Make the vector [1 2 3 4 5 6 7 8 9 10]
In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

4 years ago

Solved

Eliminate unnecessary polygon vertices
Suppose you have an n-point polygon represented as an n-by-2 matrix of polygon vertices, P. Assume that the polygon is closed; t...

4 years ago

Problem trying to access labeled portion of images (updated 7/5)
The error occurs for m=559. If you look at the object: figure, imshow(K==559) set(gca,'xlim',[481 580],'ylim',[500 6...

4 years ago | 0

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fminbnd fails to converge with exitflag=1
because TolX is a measure of change in x between two successive iterations and not an indication of how close it is to a true mi...

4 years ago | 0

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Skull striping without affecting tumor region
The simplest way to segment the tumor in the sample image would be to use region growing algorithm. There are a few implementati...

4 years ago | 0

Solving an implicit function, fsolve vs. fzero
You can try the following approach: abc=rand(3,1); % A, B, C parameters q=8; % order of the polynomial ...

4 years ago | 1

does anybody have a matlab code for revised simplex method with box vriables like -2<=x<=10....etc
yep, there is a submission of this sort on FEX: http://www.mathworks.com/matlabcentral/fileexchange/8277-fminsearchbnd-fminse...

4 years ago | 0

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weird results with relational operation ==
The expression xchk == X3 is indeed false, however , if you check the value of abs(xchk-X3) you will find it to be le...

4 years ago | 1

| accepted

The "imregconfig" and " imregister" functions . help
You will not find these functions with your version of MATLAB because they were made available quite recently with the R2012a ve...

4 years ago | 0

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triangles generated by isosurface
Hi Sayed, unfortunately there are no built-in Matlab functions that would allow you to regularize your mesh. There is, however,...

4 years ago | 0

| accepted

Get line properties from it's handle
try this: x=get(lineHandle,'XData'); y=get(lineHandle,'YData'); x and y variables respectively should be the x and y ...

4 years ago | 1

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Identify decaying or growing sinusoidal graph
find the peaks, order them according to time and compare their magnitudes. see: http://www.mathworks.com/matlabcentral/fileex...

4 years ago | 0

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why fmincon optimizer does not optimize my last variable ?
it seems that your cost function is independent of that last variable

4 years ago | 0

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How to smooth an edge. I need you help very urgent
If you have IPT see the documentation for 'bwmorph' function. Amongst other things it allows you to remove spurious details of t...

4 years ago | 0

| accepted

see page 12 of this document: http://eecourses.technion.ac.il/049029/presentations/RadonTransform%20-%20slides.pdf

4 years ago | 1

Minimizing mean square error for a body tracking problem
No pen and paper necessary. Here is code for the function that I already have: function [R,t,s]=SymTformParams(Xref,Xsrc) ...

4 years ago | 0

| accepted

Minimizing mean square error for a body tracking problem
If point correspondences are known, do the following: 1) solve for translation, by comparing the centroids of the landmark se...

4 years ago | 0

Clean-up isosurface output
http://www.mathworks.com/matlabcentral/fileexchange/27667-splitfv-split-a-mesh

5 years ago | 0

| accepted