Reading a RAW file from a hyperspectral camera using ENVI information

Question

Henk-Jan Ramaker 2021-6-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/853385-reading-a-raw-file-from-a-hyperspectral-camera-using-envi-information

评论： sravan kumar sikhakolli 2022-12-27

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I have captured and stored data that comes from a hyperspectral camera. This results in 2 files:

''example_file.raw''

''example_file.hdr''

I use the function read_envihdr to load ''example_file.hdr'':

example_file.hdr

>> read_envihdr('example_file.hdr')
ans = 
  struct with fields:
             CONTENT: 'ENVI'
           file_type: 'ENVI Standard'
         sensor_type: 'MONARCH'
    wavelength_units: 'nm'
           data_type: 12
          interleave: 'BSQ'
          byte_order: 0
           bit_depth: 10
       header_offset: 0
          wavelength: {10×1 cell}
                gain: {10×1 cell}
       exposure_time: {10×1 cell}
       exposure_type: '{↵radiometric-calibration↵}'
       default_bands: {[713]}
               lines: 1024
             samples: 1280
               bands: 10
                size: [1024 1280 10]
             machine: 'ieee-le'
           iscomplex: 0
              format: 'uint16'
>> 

Now, I don't have much experience reading hyperspectral data. But what I understand so far is that the ENVI standard is more or less required (or at least very handy) to load the *.raw file. Can anybody give me a hint how to proceed further to read the *.raw file now that I have the ENVI standard information available?

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Answer 1

Subhadeep Koley 2021-6-11

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https://ww2.mathworks.cn/matlabcentral/answers/853385-reading-a-raw-file-from-a-hyperspectral-camera-using-envi-information#answer_722390

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You can use the enviinfo(__) function to read metadata from your ENVI header file (.hdr file), and then you can use multibandread(_) to read the binary .raw file.

% Read ENVI header file
info = enviinfo('example_file.hdr');
% Read the .raw data file
data = multibandread('example_file.raw',[info.Height, info.Width, info.Bands],...
       info.DataType, info.HeaderOffset, info.Interleave, info.ByteOrder);

NOTE: The above mentioned fetures (e.g. enviinfo(_)) come under Image Processing Toolbox's Hyperspectral Imaging Library support package, and can be downloaded from here.

For more information on Hyperspectral Imaging Library see the documentation.

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Emma Stewart 2022-5-5

@Subhadeep Koley why this file is not readable with above code? this code is not working here

The HSI file size is bigger than 5 MB (Matlab attachment limit), so i have uploaded the file on drive Link to access image file: https://drive.google.com/drive/folders/1GTSkQMog4EvffH_geeKJun0oX6BCh5zo?usp=sharing

any idea thanks a ton

Emma

sravan kumar sikhakolli 2022-12-27