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Subhadeep Koley


Last seen: 1 day ago

MathWorks

223 total contributions since 2019

I am a Software Engineer here at The MathWorks.

My areas of interest are Image Processing, Pattern Recognition, Computer Vision & Graphics, and plotting.

DISCLAIMER: Any advice or opinions here are my own and in no way reflect that of The MathWorks.

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Answered
hypercube or hyperpca not found. Not even in R2020b .why ?
hypercube, hyperpca and other hyperspectral related functions come under Image Processing Toolbox's Hyperspectral Imaging Librar...

1 month ago | 1

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Answered
PDF Latex file using Matlab
Copy and paste your code into a new Live Script. In the Live Editor tab, select Export > Export to LaTeX. MATLAB will also auto...

2 months ago | 0

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Answered
How to load AVIRIS datasets
You can use the hypercube(__) function to read AVIRIS image .hdr files. % Read the AVIRIS image (specify your image file name h...

2 months ago | 2

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Answered
Save the Figures Getting From ANFIS designer
In the Membership Function Editor, Click on File > Export > To Workspace. Provide the workspace variable name (e.g. yourMemFis) ...

2 months ago | 0

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Answered
dn2reflectance issues (need to radiometrically correct imagery)
dn2reflectance(__) would work fine as long as the metadata of you multispectral image contains the reflectance gain values. Belo...

2 months ago | 0

Answered
Random square sampling for single channel images
Hi, here is one working example. Hope this helps! % Read the original image img = imread('cameraman.tif'); [row, col, ~] = s...

2 months ago | 0

Answered
how to plot matrix
This code snippet extracts out the first image and plots it. Similarly you can extract the other images. % Defining a random ma...

2 months ago | 0

Answered
How to a='10101111' convert array b=[1,0,1,0,1,1,1,1]
charArray = '10101111'; newCharArray = double((charArray == '1'));

2 months ago | 1

Answered
FFT OF A SIGNAL
Hi, there are several lines (e.g. line 39, line 110, etc.) in your code, which start with the word "Appendix". Those lines are n...

2 months ago | 0

Answered
compacting a large number of plot lines
ind = 1; angleValues = 0:20:360; % Modify angle values as per your requirement phiValues = zeros(1, numel(angleValues)); fo...

2 months ago | 1

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Answered
Export image from image segmenter and maintain the original image
1) Click on the "Export" button and then click on "Export Images" 2) Save the Final Segmentation mask with the name BW, click o...

2 months ago | 0

Answered
Binary image conversion from real image
Hi, imbinarize expects pixel values of data type double and single to be in the range [0, 1]. We should use the rescale function...

2 months ago | 1

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Answered
Finding and Extracting Instances from a Text File
Hi, the below code might help. % Open the file fid = fopen('sample_text.txt'); % Read the file by character str = fread(fi...

2 months ago | 0

Answered
How to reset typing in loop input?
sigma = input('Insert normal stresses[Mpa] and shear stresses[Mpa] of the cauchy stress tensor:'); if isempty(sigma) || ~all(si...

2 months ago | 0

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Answered
Can i use imerode() function to perform top-hat transform?
You can achieve the same result as returned imtophat function only using imerode and imdilate. % Load the image original = imr...

3 months ago | 1

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Answered
PCA on a 3d Matrix
You can use the hyperpca function to achieve the same. % Definenumber of principal components you require numComponents = 10; ...

3 months ago | 0

Answered
Extracting wavelength vector from an .hdr file
You can use the enviinfo function to achieve the same. % Load the HDR information info = enviinfo('yourFile.hdr'); % Extract ...

3 months ago | 0

Answered
Grey Scale -> RGB images from augmentedImageSource
You can use the ColorPreprocessing Name-Value pair of augmentedImageSource to achieve what you want. imageSize = [227 227 3]; ...

3 months ago | 1

Answered
Increasing exposure of an image
A simple approach could be adding a constant value to the entire image. Like below, % Load the image img = imread('photo1.jpg'...

3 months ago | 0

Answered
How to write included function into other
First of all define these two functions, coin_flip and sum_tails function r = coin_flip(N) i = rand(1, N); r = (i > 0.5); en...

3 months ago | 0

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Answered
Vingetting an image using loop
Hope this works. colorImg = im2double(imread('kobi.png')); center = size(colorImg)/2+.5; [l,h,~] = size(colorImg); d = zeros...

3 months ago | 0

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Answered
I don't know what is wrong with my code when recreating a table
loop indices must be positive integers or logical values. In your code, you're trying to use fraction values as index. Also, you...

3 months ago | 0

Answered
View multiplage tiff in app designer
For multi-page file, imread only reads the first slice in the file (or a specific slice specified by an optional argument). If...

3 months ago | 0

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Answered
How to find the percentage of smaller than X in a specific column in all tables in a cell
clc load CELL.mat % Extract all 5th columns newMat = zeros(360, 1); for idx = 1:length(CELL) newMat(:, idx) = CELL{1}.c...

4 months ago | 1

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Answered
ImageDatastore from text file
Try this code snippet. The below code will read images, whose locations are specified in the testingdata.txt file and will also ...

4 months ago | 0

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Answered
how can n I export file with Excle format, with fprintf
fprintf can only write data to text file. It cannot write data to Excel file. TO write data in Excel format use the function wri...

4 months ago | 0

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Answered
color array to grayscale, images
% Read the image img1 = imread('photo1.jpg'); % Convert it to double img1Double = im2double(img1); % Convert from RGB to...

4 months ago | 0

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Answered
How to extract rows based on a particular column values in a matrix?
load 'D.mat'; D_new = D((D(:, 2) >= 1) | (D(:, 2) <= -1), :);

4 months ago | 0

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Answered
I have a row vector of dimension 1x300 and want to set its elements to zero without changing its dimension. I am trying to implement it using the example X = zeros(1,3,'uint32') provided in the documentation on zeros in mathworks.
Hi Sushma TV, the below code might help % Define a random vector 'X' for example X = rand(1, 300); % Set all elements of 'X' ...

4 months ago | 0

Answered
How to save images from for loop to use for machine learning algorithm?
imageDatastore can only create an image datastore from the collection of image data specified by their location. However, you're...

4 months ago | 0

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