Score the Hyperspectral image pixel value 0 to 100

Question

jaeyoung gwak 2023-3-23

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https://ww2.mathworks.cn/matlabcentral/answers/1933765-score-the-hyperspectral-image-pixel-value-0-to-100

编辑： Abhishek Tripathi 2023-3-23

I'm wondering if i could score the hyperspectral image.

I found out that hyperspectral image is based on visual light colors.

What i want to make is making visual light colors to color map. And i click certain pixel in the image it shows the score based on visual light colormap.

Here's the drawing what i thought.

I know how to score the pixel value by comparing it with colormap.

But I have no idea how could make an colormap with visual light color spectrum basesd on Hyperspectral image.

Hope to get some advice.

Thanks.

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Answer 1

Image Analyst 2023-3-23

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From the help:

Create Truecolor Composite from Multispectral Image

The LAN file, paris.lan, contains a 7-band 512-by-512 Landsat image. A 128-byte header is followed by the pixel values, which are band interleaved by line (BIL) in order of increasing band number. They are stored as unsigned 8-bit integers, in little-endian byte order.

Read bands 3, 2, and 1 from the LAN file using the MATLAB® function multibandread. These bands cover the visible part of the spectrum. When they are mapped to the red, green, and blue planes, respectively, of an RGB image, the result is a standard truecolor composite. The final input argument to multibandread specifies which bands to read, and in which order, so that you can create an RGB composite in a single step.

truecolor = multibandread('paris.lan',[512, 512, 7],'uint8=>uint8', ...

128,'bil','ieee-le',{'Band','Direct',[3 2 1]});

The truecolor composite has very little contrast and the colors are unbalanced.

imshow(truecolor)

title('Truecolor Composite (Un-Enhanced)')

text(size(truecolor,2),size(truecolor,1)+15,...

'Image courtesy of Space Imaging, LLC',...

'FontSize',7,'HorizontalAlignment','right')

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Answer 2

Abhishek Tripathi 2023-3-23

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https://ww2.mathworks.cn/matlabcentral/answers/1933765-score-the-hyperspectral-image-pixel-value-0-to-100#answer_1199060

编辑：Abhishek Tripathi 2023-3-23

With our hyperspectral support package, you can generate false color and RGB image of a hyperspectral image. Use below code

% Read a hyperspectral data into the workspace.

hcube = hypercube('paviaU.dat');

% Estimate an RGB image of the hyperspectral data. Increase the image contrast by applying contrast stretching.

coloredImg = colorize(hcube,"Method","rgb","ContrastStretching",true);

% Display the contrast-stretched RGB image.

imshow(coloredImg)

For better visualization of hyperspectral images, I recommend to use hyperspectral Viewer app. Hyperspectral Viewer app enables you to read hyperspectral data, visualize individual band images and their histograms, create a spectrum plot for a pixel or region in a hyperspectral data cube, generate color or false-color representations of hyperspectral images, and display metadata.

% Load Hyperspectral Data into Workspace

hcube = hypercube('jasperRidge2_R198.img');

% View Hyperspectral Data in Hyperspectral Viewer

hyperspectralViewer(hcube)

If you would like to explore more about the hyperspectral domain, kindly go through this:

Hyperspectral Image Processing - MATLAB & Simulink (mathworks.com)

Image Processing Toolbox Hyperspectral Imaging Library - File Exchange - MATLAB Central (mathworks.com)