Anton Semechko

Last seen: ungefär en månad ago | Active since 2012

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Biomedical/R&D engineer with 10+ years of academic + industry experience and avid user of Matlab for 15+ years. Enjoy problem-solving and working on projects related bio-signal processing, medical and microscopy image processing, computational anatomy, and machine learning.

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Where is the search bar on the Matlab File Exchange website?
This is more of a recommendation to the MathWorks website developers rather than a quesiton. I don't use File Exchange (FEX) of...

5 månader ago | 1 answer | 0

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Submitted

Detect outliers in multivariate datasets
Compute robust estimates of mean and covariance, and flag potential multivariate outliers

ungefär 3 år ago | 2 downloads |

Submitted

IsoCut
Extract/visualize level set(s) of a scalar field defined at the vertices of a surface mesh

mer än 3 år ago | 3 downloads |

Submitted

Particle tracking on a sphere
Fast particle tracking and ray-triangle intersection queries on triangular meshes of a unit sphere

mer än 3 år ago | 1 download |

Submitted

Fast fuzzy c-means image segmentation
Segment N-dimensional grayscale images into c classes using efficient c-means or fuzzy c-means clustering algorithm

mer än 3 år ago | 13 downloads |

Submitted

Exact histogram equalization and specification
Perform exact histogram specification or equalization of 2D grayscale images

mer än 3 år ago | 8 downloads |

Submitted

DecimatePoly
Simplify a 2D closed contour/polygon to within user-defined boundary offset tolerance

mer än 3 år ago | 2 downloads |

Submitted

Exact minimum bounding spheres and circles
Compute exact and approximate minimum bounding spheres/circles of 3D/2D point sets

mer än 3 år ago | 10 downloads |

Submitted

Suite of functions to perform uniform sampling of a sphere
Toolbox for generating uniform sampling patterns and decompositions of a unit sphere

mer än 3 år ago | 13 downloads |

Submitted

Rigid body parameters of closed surface meshes
Fast computation of exact rigid body parameters of closed triangular surface meshes using divergence theorem

mer än 3 år ago | 3 downloads |

Question

none of the axes interactions are working in axes embedded in a UIFigure panel
Problem: The interactions of an axes object embeded in a UIFigure panel are not working. The interactions I am trying to add to ...

mer än 3 år ago | 0 answers | 0

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answers

Answered
PCA on high dimensional data
A 13952736-by-104 data matrix (with observations along rows and variables along columns) will take up 13952736*104*8/2^30 =...

mer än 6 år ago | 0

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Answered
Fitting scattered data to multiple cosine functions
Below is an example where I use brute-force search to find an optimal set of sinusoid parameters that best fit an unorganized da...

mer än 6 år ago | 2

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Answered
imshow() not working
Use syntax: imshow(im,[]) when im has non-integer format. Or just do this: im = imread('/MATLAB Drive/My Project/ima...

mer än 6 år ago | 3

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distance of points to points calculation
Use <https://www.mathworks.com/help/stats/knnsearch.html#namevaluepairarguments 'knnsearch' function>. For example: [idxA,D_...

mer än 6 år ago | 0

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Answered
How is the number of bins chosen with the auto binning algorithm in histcounts?
'histcounts' first estimates width of the histogram bins using 'scottsrule': rawBinWidth = 3.5*std(data)/(numel(data)^(1/3...

mer än 6 år ago | 1

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Answered
Barycentric Coordinates of a spherical triangle
This can be done in four steps: 1) Compute linear transformation (T) that maps triangle A to its counterpart B on the sphere....

mer än 6 år ago | 0

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How do I use a .lut file (or the equivalent in MATLAB) to reference pixels in a grayscale image and assign them new values for pseudocoloring based on the LUT?
There is a Matlab function that maps gray values to RGB values using custom made look-up-tables. Its called 'ind2rgb': <https://...

mer än 6 år ago | 0

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Answered
Transformation of the complex plan: Conformal Mapping
Modified code ('conformal_map_demo') is attached below. In principle, this piece of code should should allow you to visualize an...

mer än 6 år ago | 3

Answered
How to sum each column element of one matrix with all column elements of another matrix?
Do kron([a b;c d],[1;1]) + kron([1;1],[i j;k l]) Here is an example using symbolic expressions syms a b c d i j k l...

mer än 6 år ago | 0

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Answered
Generating sets of non repeating random numbers
Here is an example: S=reshape(randperm(40),[],4); All elements in S will be in the range [1 40] and unique. From this it...

mer än 6 år ago | 1

Answered
3D plane plotting restricted by 3 points
Equation of a plane is determined uniquely by any 3 (noncollinear) points lying on the plane. Based on your question, it sounds ...

mer än 6 år ago | 0

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Answered
Could anyone help me with extracting similar features( to be used as corresponding points)in two images which need to be registered together?
Hey, Poupack, here is <https://drive.google.com/open?id=1SRXAVFkbHPfQ9jLjsFL-fkfWz2KrKJAO link> to a function ('pairwise_his...

mer än 6 år ago | 0

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Answered
How can I extract the slices of a 3D matrix in x-direction from a 3D matrix?
Suppose you have G, which is a Y-by-X-by-Z 3D array, then i-th xy slice: G_yx=G(:,:,i); % Y-by-X array i-th xz slice...

mer än 6 år ago | 2

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Answered
Multivariate nonlinear regression model fitting
If the function you are trying to fit is linear in terms of model parameters, you can estimate these parameters using linear lea...

mer än 6 år ago | 1

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How to export 3D spheres (3D plot) generated in Matlab to ANSYS or Abaqus. ?
The builtin 'ellipsoid' and 'sphere' functions produce bad quality meshes (in terms of element shapes and connectivity of the ve...

mer än 6 år ago | 1

Answered
Is there a way to open music and play it?
Yeah, there is a way. Here is an example: % Get sample audio file from the web [y,Fs]=webread('http://www.worldnationala...

mer än 6 år ago | 1

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Answered
How do I compute the maxpool of a image? Let us say stride of 2,2 on a mxn matrix?
Here is an example: % Sample image im=imread('cameraman.tif'); % sample image % 4 pixels comprising non-overlappi...

mer än 6 år ago | 0

Answered
How do I plot a plane that has points of different values?
Actually, based on the sample picture you provided, you have a total of 17x21 grid points, and total number of cells in the g...

mer än 6 år ago | 2

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Answered
Obtain Number of Pixels in Area Around Binary Image Object
To distinguish between points/pixels inside the ellipse vs. those outside, you need to know parameters of the ellipse. Here is a...

mer än 6 år ago | 0

| accepted

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