hyperspectral imaging signature plot

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Alexai
Alexai 2022-9-18
回答： Mandar 2023-2-9
I have hyperspectral imaging raw data.
How can I get like this plot (reflectance, wavelength)
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Alexai
Alexai 2022-9-18
I have raw data(including hdr file)
But I want to know related code.
Rik
Rik 2022-9-18
You didn't answer my question. Have a read here and here. It will greatly improve your chances of getting an answer.
You can also have a look at the answer Sulaymon posted.

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回答（3 个）

Sulaymon Eshkabilov
It can be obtained with the following steps:
(1) Import your HSI data into MATLAB. In other words, read your hypespectral images. You may use any available apps or HSI data reader apps, or 3rd party developed toolboxes, like this one: https://www.mathworks.com/matlabcentral/fileexchange/61630-matlab-hyperspectral-toolbox
(2) Just plot using plot() command, for instance.
(3) If your HSI data are noisy, you can smooth them by using smooth() or smoothdata(), sgolayfilt().
Image Analyst
Image Analyst 2022-9-18
Read your images into a 3-D array, then do this:
image3d = rand(100, 100, 32); % Create sample data.
[rows, columns, numChannels] = size(image3d)
figure;
hold on;
for row = 1 : rows
fprintf('Plotting spectra from row #%d of %d.\n', row, rows)
for col= 1 : columns
thisSpectra = squeeze(image3d(row, col, :));
plot(thisSpectra, '-');
end
% Update plot
if mod(row, 20) == 0 || row == 1
caption = sprintf('Spectra 1 though %d.\n', row * columns);
title(caption);
xlabel('Wavelength (nm)');
ylabel('Reflectance');
drawnow;
end
end
grid on;
xlabel('Wavelength');
ylabel('Reflectance (nm)');
fprintf('Done plotting %d spectra.\n', rows * columns)
Mandar
Mandar 2023-2-9
Install the hyperspectral imaging library from this link. Use “hypercube” function to read the hyperspectral data. The function returns the hypercube object. The “DataCube” property of the object holds the hyperspectral data in 3-D numeric array. Access the data and use “plot” function to get the reflectance values on Y-axis for respective wavelengths on X-axis.

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