How to create RGB image with 3 bands from hyperspectral image?
31 views (last 30 days)
Hi, I have a Hyperion EO-1 satellite image and i want to create an RGB band with band numbers (40,31,13) as (R,G,B). The hyperion image has 242 bands. But I'm having trouble opening the L1R file properly.
I am using Matlab 2011, and 2014 hyperion image. I load the image with hdfinfo and hdfread commands like this;
fileinfo = hdfinfo('EO1H1930282003203110PY.L1R');
sds_info = fileinfo.SDS(1);
But this loads a matrix [3128,242,256] , although it should be [3128,256,242] how can i fix this?
After loading the image as 3D matrix i try to create the RGB image with selecte 3 bands as shown below it creates [3128,3,256] matrix but I cant use imwrite, imshow or any other displaying functions on it.
imrgb [:,1,:] = imhdf [:,40,:];
imrgb [:,2,:] = imhdf [:,31,:];
imrgb [:,3,:] = imhdf [:,13,:];
Error using image
Error using image
Indexed CData must be size [MxN], TrueColor CData must be
Please answer, thank you.
Cong Huynh on 14 Aug 2015
You could use the Scyllarus hyperspectral image processing toolbox. The MATLAB version of this toolbox is available for non-commercial use and can be downloaded from http://scyllarus.research.nicta.com.au/
To load and save multispectral images (consisting of pairs of .hdr and .fla files), the functions to look at are FLARead and FLAWrite under src/io. With these functions you can read from and write to the .fla format (ENVI-compatible), rather than any colour image format. Alternatively you can save the image to a .mat file but this option usually produces a much larger image.
To convert a hyperspectral image to RGB, you could use the function recover_RGBImage.m under /src/shared. There are examples in that .m file.
More Answers (3)
Ben Worker on 15 Jul 2015
Here is a sample code to try. It allowed me to view LR1 images.
sds_info = field_info.SDS(1);
imrgb(:,:,1) = imhdf(:,27,:);
imrgb(:,:,2) = imhdf(:,18,:);
imrgb(:,:,3) = imhdf(:,9,:);
imrgb = double(imrgb);
gain = 3000;
Image Analyst on 8 Mar 2017
Subhadeep Koley on 31 Mar 2021
Edited: Subhadeep Koley on 31 Mar 2021
You can use the hypercube(__) function to read Hyperion EO-1 L1R files and also the colorize(__) method will help you to estimate color image of the Hyperion EO-1 L1R image.
% Read the L1R image (specify your L1R file name here)
hCube = hypercube('EO1H1930282003203110PY.L1R');
% Estimate the RGB image
rgbImg = colorize(hCube, 'method', 'rgb', 'ContrastStretching', true);
% Visualize the RGB image