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Subhadeep Koley

MathWorks

Last seen: 2 years ago |  Active since 2019

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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
How to calculate signal to noise ratio of hyperspectral image refolded in 2D matrix format?
As per my understanding, "A single value for SNR" indicates the overall SNR between the noisy and cleaned data. While in order t...

3 years ago | 0

| accepted

Answered
MATLAB hyperspectral toolbox issues
1) The error is originating from line number 53 of "enviinfo.m". It seems that you have one local custom function in the name o...

3 years ago | 1

Solved


The Piggy Bank Problem
Given a cylindrical piggy bank with radius g and height y, return the bank's volume. [ g is first input argument.] Bonus though...

3 years ago

Answered
how to use 'createImagePatchesFromHypercube' function
It seems you're trying to execute createImagePatchesFromHypercube outside of the "Classify Hyperspectral Images Using Deep Learn...

3 years ago | 1

| accepted

Answered
How to make an ENVI header file."?
Looks like the indian_pines.hdr ENVI header file has been modified in your system. For a valid ENVI header file, the first four ...

3 years ago | 0

Answered
Reading a RAW file from a hyperspectral camera using ENVI information
You can use the enviinfo(__) function to read metadata from your ENVI header file (.hdr file), and then you can use multibandrea...

3 years ago | 1

Answered
How to read hyperspectral data without wavelenth data?
If you know the height, width, and number of spectral bands of your data, you can try using multibandread(_). However, in orde...

3 years ago | 0

| accepted

Answered
How to read hyperspectral data
The error is originating from line number 53 of "enviinfo.m". I suspect you have one local custom function in the name of "envi...

3 years ago | 0

| accepted

Answered
My batch image processing is only processing the last image of the folder!
You're calculating imhist() outside of the for loop that is why only the last read image is being processed. You need to use the...

3 years ago | 1

| accepted

Answered
Phase Scrambling/Fourier transform of Images?
phase_scrambled_img is of type double but its range is beyond [0, 1], therefore use the below syntax so that imshow(_) can scale...

3 years ago | 0

| accepted

Answered
The following cmd doesnt work "openExample('uav/ConnectPosesOfAllValidUAVDubinsPathsExample')"
The example you're trying to launch comes under UAV Toolbox. You have to have UAV Toolbox installed in order to use that example...

3 years ago | 1

| accepted

Answered
Hyperspectral Imaging preprocessing method for raw data acquired from hyperspectral camera? tools or algorithm
You can use Image Processing Toolbox's Hyperspectral Imaging Library support package. It can be downloaded from here. You can ...

3 years ago | 0

Answered
How to detect and separate pixels in an image
rgbImg = imread('image.png'); grayImg = rgb2gray(rgbImg); greenMask = detectGreen(rgbImg); figure imshow(rgbImg); hold on...

3 years ago | 0

| accepted

Answered
Help with User defined function
function y = UnitConversionsFunction(x, options) % Validate that value is a character vector or string scalar. (Works only wi...

3 years ago | 0

Answered
Goodness of fit using chi2gof
Wasim, this link might help you.

3 years ago | 0

Answered
How do I change the array of 200x2x100 to 100x2x200?
% Generate demo data data = rand(200, 2, 100); % Permute the data newData = permute(data, [3 2 1]); size(data) size(n...

3 years ago | 1

| accepted

Answered
App Designer Plot Multiple Graph
The attached minimum working example App might help you! Have a look.

3 years ago | 1

| accepted

Answered
How can I overlay an edge detected from a binary image onto a RBG image?
% Read the RGB images fig00RefFull = imread('00-Ref-Empty.jpg'); fig00RefEmpty = imread('00-Ref-Full.jpg'); % Convert those...

3 years ago | 0

| accepted

Answered
MATLAB app designer not playing sounds
I have attached one demo minimum working example. Have a look. It might help you fix the issue. Also, if possible provide the...

3 years ago | 1

| accepted

Answered
how to change hyperspectral image size array?
This code snippet might help. % Creating a random data dataCube = rand(3248,242,256); % Permuting the 2nd and 3rd channel ...

3 years ago | 1

Solved


Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

3 years ago

Answered
'unrecognized function or variable 'yolov30ObjectDetector'
This example you're executing, requires the Computer Vision Toolbox™ Model for YOLO v3 Object Detection. You can download & inst...

3 years ago | 3

Answered
How to import a .MAP OMNIC picta file into matlab
As, .MAP is not a standard file format. It is difficult to provide exact solution. However, if the .MAP file is a binary file,...

3 years ago | 0

Answered
Displaying Multispectral Image in MATLAB
You can not use imshow(_) or imagesc(_) to display Multi-plane images having more than 3 channels. You can use sliceViewer(_) t...

3 years ago | 1

| accepted

Answered
Combining hyperspectral image bands R, G, B and NIR
% Read the TIF file cube = imread('yourFile.tif'); % cube is your 8 band TIF file % Extract R, G, B, and NIR band according ...

3 years ago | 0

Answered
Read and Extract channel data from Hyperspectral images
You can use the hypercube(__) function to read and explore hyperspectral images. % Read the hyperspectral image (specify your i...

3 years ago | 0

Answered
Stacking indexed images and view the resulting volume
This code snippet might help. A = imread('image2.png'); B = imread('image3.png'); C = imread('image4.png'); [D, map] = rgb...

3 years ago | 0

Answered
I have multispectral image of [ 8225,8850,6]. How to read image and i need to seperate bands for analysis?
For visualization of individual pixel spectra / hyperspectral band image you can use the interactive hyperspetralViewer App. e.g...

3 years ago | 1

Answered
How can I combine three hyperspectral bands into an "RGB" image?
You can use the hypercube(__) function to read your ENVI file (.dat and .hdr file pair), and also the colorize(__) method will h...

3 years ago | 0

Answered
How to create RGB image with 3 bands from hyperspectral image?
You can use the hypercube(__) function to read Hyperion EO-1 L1R files and also the colorize(__) method will help you to estimat...

3 years ago | 0

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