how to convert an rgb image to hyperspectral image in matlab?

I am using MATLAB to classify healthy crop from non-healthy crop. I need to classify the image in hyperspectral mode.

i.e. an image of this form:

https://www.google.co.in/search?q=flat+spectrum+image+of+a+crop&es_sm=122&source=lnms&tbm=isch&sa=X&ei=uLThVPPVDIuruQSIuYLwDw&ved=0CAgQ_AUoAQ&biw=1366&bih=643#tbm=isch&q=hyperspectral+remote+sensing+of+vegetation&imgdii=_&imgrc=cTmIToNIZ_ocxM%253A%3BFRFU-m7Wd61ZkM%3Bhttp%253A%252F%252Fwww.mdpi.com%252F2072-4292%252F4%252F2%252F327%252Fag%3Bhttp%253A%252F%252Fwww.mdpi.com%252F2072-4292%252F4%252F2%252F327%3B550%3B231

I need to get the image in this format. How do I get that? with thanks,

karthik kumar. A

[Image Analyst]

In the image you added during your edit, that is a classified image shown in RGB. They took a multispectral image and produced a classified image with 4 classes and then displayed that in RGB - each class having a different RGB. This is totally different than what you asked. You cannot take that classified image displayed in RGB pseudocolor and get back to the original hyperspectral images that were used to create it.

Answer 1

[Image Analyst]

Well, you'd have to know the spectrum of your illumination, and the spectral responsivities of your camera sensor. Do you know those? Or do you just want to assume flat spectrum or D65 spectrum illumination? And responsivity of the camera that matches the chromaticity curves of the human eye?

[joynjo]

could you share any detail reference about it?

[Image Analyst]

Not off the top of my head. You can contact manufacturers of light source and camera manufacturers for the spectral curves of their devices.

[joynjo]

I have 6 image from RGB camera, taken from different illumination (300 nm to 700nm). I need to measure reflectance image, I have the data of camera sensitivity and illumination. Do you have any reference to calculate it using matlab?