Getting this error in hyperspectral toolbox "Expected Gain values in input header file to be an array with number of elements equal to 301"

I am getting this error when I want to see the hypercube of the data by hyperspectral camera

Error using hypercube

Expected Gain values in input header file to be an array with number of elements equal to

301.

Error in hypercube>fieldValidator (line 1369)

validateattributes(info.(field{No}), type, attr,'hypercube',fieldName);

Error in hypercube>validateMetadata (line 1343)

fieldValidator(info, fields, type, attrs);

Error in hypercube (line 305)

validateMetadata(obj.Metadata);

Error in untitled2 (line 4)

hcube = hypercube('Cropped_Cancer.dat');

The code which I used was

clc

clear

info = enviinfo('Cropped_Cancer.hdr');

hcube = hypercube('Cropped_Cancer.dat');

[Walter Roberson]

Try using enviinfo() to examine the header information.

Answer 1

[Keerthana Ramesh]

Hi,

The issue could be due to format mismatch between Gain values in your header file and expected Gain values. The possible workaround for this issue to be resolved can be by editing the Gain value in the header file.

You can use the command below to open the *.hdr file in the Editor. Check whether the first four characters are 'ENVI' or not. If not, you can modify the file to have first four characters as 'ENVI' and, save it.

>>  edit your_file_name.hdr

Then you can add your customized Gain value as:

gain = {1, 2, 3, … 301}

Suppose you have only one gain value, then it should be a 301-by-1 array with the same value. But you must manually set up every value in the header file. Alternatively, you can also write hyperspectral data to ENVI file format using ‘enviwrite’ function if it works for your workflow.

Then you can use the ‘enviinfo’ command to check if the Gain value has been successfully set up.

Please refer to the following documentation about more details:

https://www.mathworks.com/help/images/ref/enviinfo.html

https://www.mathworks.com/help/images/ref/hypercube.enviwrite.html

Thanks,

Keerthana

[Himanshu Joshi]

Thanks, the problem is resolved.