# Yuvaraj Venkataswamy

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My area of interests are image processing and signal processing.

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**Feeds**

Area measurement of image objects using regionprops

@Walter Roberson I got it. Thank you so much!.

4 years ago | 0

| accepted

Question

Area measurement of image objects using regionprops

I have 10 similar images where all the image have 5 objects. I need to find areas of objects. I have converted grayscale imag...

4 years ago | 2 answers | 0

### 2

answersQuestion

How to extract text from image?

How to extract text from attached image?

4 years ago | 0 answers | 0

### 0

answersplotting x and y data contineously

Check with below FAQ <https://in.mathworks.com/matlabcentral/answers/298866-how-to-plot-two-n-n-matrices-in-same-plot>

4 years ago | 0

| accepted

how can i reduce the bit rate of a video using matlab

Hi, you can apply video compression techniques and also reduce the frame size.

5 years ago | 0

I am working on Iris recognition I have to compare one iris image with all the database.For that I have to use hamming distance which I calculated and stored it in .mat file but I do not understand that how to do comparison using .mat files.

Hi, please check below FAQ, https://www.mathworks.com/matlabcentral/answers/344233-hello-i-wanna-do-iris-recognition-by-compare...

5 years ago | 0

How create training and testing data with k-fold validation using neural network ?

K-fold cross validation you can use, https://www.mathworks.com/help/stats/cvpartition.test.html, https://www.mathworks.com/he...

5 years ago | 0

| accepted

How to check the number of ones from certain row to the 1st row?

MathWorks Please use this

5 years ago | 0

FFT computation for a sampled data output

The function that you are used for loading .csv file is incorrect. please use below line. if true x = readtable('sin10...

5 years ago | 0

L2 norm or Frobenius norm?

Use 'fro' to estimate the Frobenius norm of a matrix, which estimates the 2-norm of the matrix. if true x=your_matrix;...

5 years ago | 1

Saving Images in a Cell Array

Hi, first You have to save your input images as "001_001.jpg", "001_002.jpg"...."001_023.jpg", "002_001.jpg", "002_002.jpg" e...

6 years ago | 1

How to velocity update in PSO?

Please check this example code, <https://in.mathworks.com/matlabcentral/fileexchange/52857-particle-swarm-optimization-pso>

6 years ago | 1

| accepted

i have binary image and need to divide it into blocks

if true I = binary_image; numBlkH = 8; numBlkW = 8; [imgH,imgW,~] = size(I); szBlkH = [repmat(fix(imgH/...

6 years ago | 0

| accepted

Hi I am trying to fminsearch to optimize couple of parameters, however when I give the start I get the following error Optimization running. Error running optimization. XLSREAD unable to open file 'C:\Users\GJ computational\Desktop\Book2.xlsx'. File

<https://in.mathworks.com/matlabcentral/answers/7145-how-to-import-numerous-excel-files-into-matlab>

6 years ago | 0

i need to solve this equation

if true eqn = 81^7-(x/27)^(2*x) == 0; solx = solve(eqn, x) end

6 years ago | 0

classify the data using LSTM

Check this link, where you can create net based on your requirements, <https://in.mathworks.com/help/nnet/ug/long-short-term-...

6 years ago | 1

| accepted

How do I make an average of points ?

Check this, if true X = rand(11,10); k = 6; MA = movmean(X,[(k-1) 0]); Y = MA(k:k:end,:); end

6 years ago | 0

Plot range of values as bars

For example, if true x = 1:1:12; y = [34 23 47 28 41 35 21 18 38 20 30 32]; bar(x,y) end

6 years ago | 0

Plot range of values as bars

Check this, <https://in.mathworks.com/help/matlab/ref/bar.html>

6 years ago | 0

How to use textscan to read my 2nd column and ignore the string or non numerical values?

You can use this, <https://in.mathworks.com/matlabcentral/answers/161434-reading-only-numeric-data-in-a-text-file>

6 years ago | 0

Save figure as pdf without changing fontname

You can use this, <https://in.mathworks.com/help/matlab/creating_plots/save-figure-at-specific-size-and-resolution.html>

6 years ago | 1

How to plot a surface from 3D lines?

Try this, <https://in.mathworks.com/matlabcentral/answers/67190-how-to-plot-3d-using-coordinates>

6 years ago | 0

could anyone help me how to write the expression in matlab

if true M=yourInteger; % greater than 1 for k=0:M-1 t(M-1)=[M-1;k].*t(k) end end

6 years ago | 0

Plotting a 3D surface

Try this, if true x = linspace(0,1,3); y = linspace(0,1,3)'; [X,Y] = meshgrid(x,y); Z = (X.^3) - 3*X.*...

6 years ago | 1

Grouping elements by conditions

This is your answer. X=[ 1 1.2 1.5 1.9 5 8 8.1 10 12 12.3 12.5]; Len=diff([0,find(diff(a)>1),numel(a)]); S=ma...

6 years ago | 4

Deletion of first element from excel while writing that in to txt file

This will be the your answer. if true misvar = xlsread('mistry.xls'); misvar(1,1)=""; % empty string end

6 years ago | 1

how to index a 3D image

@Stephen Devlin: For this also, you can see the below link. <https://in.mathworks.com/help/images/examples/enhancing-multispe...

6 years ago | 1

| accepted

divide image into blocks whatever the number of these blocks

Please check the link, <http://www.andrewjanowczyk.com/dividing-and-re-merging-large-images-humpty-dumpty/>

6 years ago | 0

How to make a truecolor tif from arrays

Please check this, <https://in.mathworks.com/help/images/examples/enhancing-multispectral-color-composite-images.html>

6 years ago | 2

| accepted

i have to find periodogram of my EEG bandpassed motor imagery signal in 8, 30 hz signal. since i am new to this concept, please help me to get power density where my signal is from dataset and my sampling frequency is 250 HZ. ?

Check the link where change sampling frequency based on your requirement. <https://in.mathworks.com/matlabcentral/answers/285...

6 years ago | 0

| accepted