How to see Hyperspectral Image from a .MAT file

I have a .mat file for hyperspectral image containing 220 bands. I am trying to see the image from the .mat file.

My MATLAB version is 2018 a.

Can anyone give me some advice how to see the Hyperspectral Image ???

Any assistance will be highly appreciated.

[Walter Roberson]

There were new hyperspectral tools introduced in R2020a; https://www.mathworks.com/help/images/hyperspectral-image-processing.html

[Shibly]

I have R2018a instead of R2020a as I have already mentioned in my question.

Thanks for your seggestion by the way ...

Answer 1

[Image Analyst]

What does this say

s = load('yourMatFile.mat') % No semicolon.  Replace with your actual filename.
fieldnames(s)

Do you have 220 fields? Like s.Band1?

img = s.Band1;
imshow(img, []);

One 3-D array? So you'd have to extract the one band from the array.

See attached document.

[Shibly]

Thanks for your response...

I want to load the .mat file, read the file and then see the file information as image format with all bands available in the file.

Now, what to use instead of

Band1

to avoid the term 'ref to non-existance field' !!!

[Walter Roberson]

What shows up if you use

whos -file NAMEOFFILE.mat

[Shibly]

It is showing

Name Size Bytes Class Attributes

hsi 1x1 22452528 struct

[Walter Roberson]

Ah, okay, then, load your file and then show us

disp(hsi)

[Shibly]

Thanks Walter Roberson.

Your provided command

disp(hsi)

helped me to replace the name with >>> Band1 <<< given by Image Analyst

Thanks you Walter Roberson and Image Analyst

[Image Analyst]

So you haven't accepted the answer yet, so what's still wrong? You're not really providing us with what it says when we ask you to tell us, so we have to keep guessing. So I'm assuming you did

s = load('yourMatFile.mat'); % s is a structure.
hsi = s.hsi; % hsi is a structure with 200 fields perhaps?
% Let's get band #1 from the hsi structure.  Assume it's a field called Band1
Band1 = hsi.Band1; % or you could do Band1 = s.hsi.Band1;
% Now display it as a gray scale image:
imshow(Band1);
image('on', 'image');
title('Band1', 'FontSize', 20);

Or maybe Band1 had a different name??? So, does that work? If not show us what this reports to the command window:

whos hsi
fieldnames(hsi)  % Don't use a semicolon.

[User1]

Image Analyst, to be honest, I have not seen any of your answers solve the problems but instead create another ones. Please, be more specific with your answers.

[Image Analyst]

@User1, the comment @Shibly gave above seems to indicate that I did solve his problem, even though he didn't click the "Accept this answer" link. Perhaps you need to click the "Show older comments" link to see it.

I don't see how I created any additional problems here. In general you wil notice that my answers are far and away more detailed than other people's answers. I often/usually give fully tested, well commented full demos that solve the problem using the example image the user posted, and using very descriptive variable names. This is way more than most people do. The poster can then take my code and integrate it into their main program. On occasion the poster does not supply enough info for an answer, so sometimes we need to ask the user to clarify something or attach data.

If you have any problems specific to yourself, feel free to post them as new discussion threads.