# Amith Kamath

### U Minnesota

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Professional Interests: Image Processing, Computational complexity and algorithms

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What is the function to plot a rotating 3-D ellipsoid

function [] = visualizeDTrot(C,M,speed,Dir,time) %% C: the covariance matrix. %% Dir: direction of the estimate, to be p...

nästan 11 år ago | 1

| accepted

Hi i need help in file conversion .txt to mat file

Although this may not be the best way to do this, but you can use IMPORTDATA to import all the data from the '.txt' file as a st...

ungefär 11 år ago | 0

How to change colorbar's color (in some particular value interval)?

You can manually change the colormap, using COLORMAPEDITOR: <http://www.mathworks.com/help/matlab/ref/colormapeditor.html> ...

ungefär 11 år ago | 0

how to draw a temperature distribution on (x,y,z)?

<http://www.mathworks.com/help/matlab/visualize/representing-a-matrix-as-a-surface.html> should help. The image you have att...

ungefär 11 år ago | 0

how i can implement lowpass filter on image using matlab

I am assuming you need to smooth (low pass) an image. These two functions are what you need to use: <http://www.mathworks.com...

ungefär 11 år ago | 0

How do I obtain video (.avi) from a webcam (in real time) and store the video frames somewhere for further processing?

This will be instructive: <http://www.mathworks.com/help/imaq/examples/logging-data-to-disk.html?prodcode=IA&language=en>

ungefär 11 år ago | 0

| accepted

Confusion with adding to cell array

This should work: a = {[0 0], [0 0]} b = [1 2 3 4] a{1} = b(1:2) %choose the first two elements from b and assign to fir...

ungefär 11 år ago | 0

how to plot scattered points on 2D graph

Does <http://www.mathworks.com/help/matlab/ref/scatter.html> work? I am assuming your data is a collection of (x,y) pairs, and y...

ungefär 11 år ago | 0

how to find area,eccentricity,mean median ,mode ,variance of a white blood cell

<http://www.mathworks.com/matlabcentral/fileexchange/25157-image-segmentation-tutorial-blobsdemo> would be a good place to start...

mer än 11 år ago | 0

Display gray color only from grayscale image

For most tasks of analysing pixel values and thresholding, I've found <http://www.mathworks.com/matlabcentral/fileexchange/6770>...

mer än 11 år ago | 0

Displaying Images after feature extraction

If you have four images in I, J, K and L, you could do this, figure subplot(2,2,1); imshow(I) subplot(2,2,2); imshow(...

mer än 11 år ago | 0

What are the advantages/disadvantages to using the ball compared to the disk structuring element?

<http://blogs.mathworks.com/steve/2006/10/23/nonflat-grayscale-dilation-and-erosion/> has some details about the non-flat struct...

mer än 11 år ago | 0

| accepted

Using Matlab for Iphone or Ipad

<http://www.mathworks.com/matlabcentral/answers/12036#comment_26682> at <http://www.mathworks.com/matlabcentral/answers/12036-ho...

mer än 11 år ago | 1

| accepted

Delete rows in a matrix that contain ONLY a negative number

I'm quite positive that this does the trick. There would probably be more optimal ways to do it! X = 100.*rand(12,5); %for ...

mer än 11 år ago | 1

histograms of crossing count

Thanks for the interesting question! I'm guessing you're trying something like this. The I = (rand(500,500) >= 0.5); %i...

mer än 11 år ago | 0

how to load a picture in Matlab? can a video is uploaded in Matlab ?

<http://www.mathworks.com/products/imaq/examples.html> and <http://www.mathworks.com/help/imaq/examples/acquiring-a-single-image...

mer än 11 år ago | 0

| accepted

Using fgetl() to read lines

<http://www.mathworks.com/matlabcentral/newsreader/view_thread/297814> may be of some help. Unless you are constrained to using ...

mer än 11 år ago | 0

| accepted

I have a matrix, there are zeros values in that and i just want to remove the zero values from the array

if A is the array in question, you could do: A = A(A ~= 0);

mer än 11 år ago | 1

| accepted

Which toolboxes are needed for object detection from video over MATLAB 2009 platform?

You may want to look at: <http://www.mathworks.com/products/computer-vision/index.html> (this is not available for 2009 thoug...

mer än 11 år ago | 0

| accepted

Measuring indentation in an object

<http://blogs.mathworks.com/steve/2011/10/04/binary-image-convex-hull-algorithm-notes/> and the convex hull concept would help. ...

mer än 11 år ago | 0

I wanna replacing 2nd and 3rd column to each other. How can I write a command?

Assuming I understand the question right, here is an example of how it could be done: x = magic(5); % a random matrix fo...

mer än 11 år ago | 0

Mesh for 3D plot

Going from the error, it seems that you are trying to use mesh for a 1D array (Z in your case). Mesh expects the 'Z' to be a 2D ...

mer än 11 år ago | 0

background noise and nearst point

For either case, I would imagine you will need a mask for the brain regions. This can be done either manually using <http://www....

mer än 11 år ago | 0

convert 3d matrix to dicom image

I suppose for the time being, this happens to be the best available solution: <http://www.mathworks.com/matlabcentral/fileexch...

mer än 11 år ago | 0

what is the code to apply filters (lowpass and highpass) for signals read?

Assuming you have the Signal Processing Toolbox installed, you could use the FDA Tool to specify the parameters for your filter....

mer än 11 år ago | 0

Printing GUI figures

<http://www.mathworks.com/help/techdoc/ref/print.html> may help, although I've not tried it myself yet!

mer än 12 år ago | 0

NaN in deconvolution

Since your data has zeros in them, deconvolution may return NaNs because you are dividing by zeros. What you could do is either ...

mer än 12 år ago | 1

| accepted

showing the error out of memory

How to avoid out-of-memory cases: <http://www.mathworks.com/support/tech-notes/1100/1107.html>

mer än 12 år ago | 0

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clarification of the use 'switch case'

from <http://www.mathworks.com/help/techdoc/ref/switch.html>, In MATLAB switch blocks, only the first matching case executes...

mer än 12 år ago | 0

Convolution in MATLAB Simulink

<http://www.mathworks.com/support/solutions/attachment.html?resid=1-13ZSQN&solution=1-13ZSPM> may be of help, assuming you have ...

mer än 12 år ago | 0

| accepted