Commit d24662d2531bf1bf482134e1d92591988af21d16
Merge branch 'jahandar' into 'master'
added a Matlab function that converts images to one envi file Just some notes Dr. Mayerich: 1. The images should be stored in a struct to be loaded in the function. 2. I cast any type to float. So, if we have some files of 'double' type, we might loose some accuracy. 3. I just included the 'samples', 'lines', 'bands', 'header_offset', 'file_type', 'data_type' and 'interleave' parameters in the header file. Please let me know if you need any other things to be added to the function. See merge request !6
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| 1 | +function images2ENVI( image_struct, filename ) | |
| 2 | +%HSIWRITE : This function generates a hyperspectral binary image and header | |
| 3 | +% based on multi-dimention image | |
| 4 | +% | |
| 5 | +% | |
| 6 | +% This function accepts a srutcture which contains several channels. | |
| 7 | +% It creates a 'bsq' interleaved image and a ENVI header filer correspoing | |
| 8 | +% to the information of the image | |
| 9 | + | |
| 10 | +fields = fieldnames(image_struct); | |
| 11 | + | |
| 12 | +% check all images to have the same size | |
| 13 | +for i = 1 : size (fields, 1) | |
| 14 | + for j = 1 : size (fields, 1) | |
| 15 | + if size(image_struct.(fields{i}))~= size(image_struct.(fields{i})) | |
| 16 | + fprintf ('Dimension of input images do not Match !'); | |
| 17 | + exit; | |
| 18 | + end | |
| 19 | + end | |
| 20 | +end | |
| 21 | + | |
| 22 | + | |
| 23 | + | |
| 24 | + | |
| 25 | + | |
| 26 | +% Extracting the needed information | |
| 27 | +base_image = image_struct.(fields{1}); | |
| 28 | + | |
| 29 | +rows = size(base_image, 1); | |
| 30 | +columns = size(base_image, 2); | |
| 31 | +bands = size(fields,1); | |
| 32 | +multiDimImage = base_image'; % Matlab stores column major, transposing make it row major to be saved on memory | |
| 33 | + | |
| 34 | +% Create multi-dimentional image | |
| 35 | +for j = 1 : size(fields,1) | |
| 36 | + multiDimImage(:,:,j) = (image_struct.(fields{j})'); % Matlab stores column major, transposing make it row major to be saved on memory | |
| 37 | +end | |
| 38 | + | |
| 39 | +% create the binary image | |
| 40 | +HSImage = reshape (multiDimImage, [rows*columns*bands, 1]); | |
| 41 | +if (~isfloat(HSImage)) | |
| 42 | + HSImage_float = single(HSImage); % casting to float | |
| 43 | +end | |
| 44 | +multibandwrite(HSImage_float,filename,'bsq'); | |
| 45 | + | |
| 46 | + | |
| 47 | +% create the header file | |
| 48 | +info.samples = columns; | |
| 49 | +info.lines = rows; | |
| 50 | +info.bands = bands; | |
| 51 | +info.header_offset = 0; | |
| 52 | +info.file_type = 'ENVI Standard'; | |
| 53 | +info.data_type = 4; | |
| 54 | +info.interleave = 'bsq'; | |
| 55 | + | |
| 56 | + | |
| 57 | + | |
| 58 | + | |
| 59 | +fid = fopen(strcat(filename, '.hdr'),'w'); % open a file to write the header file | |
| 60 | +fprintf(fid,'%s\n','ENVI'); % first line of the header file showing it is an ENVI file | |
| 61 | + | |
| 62 | +info_fields=fieldnames(info); | |
| 63 | +for i = 1:length(info_fields) | |
| 64 | + parameter = info_fields{i}; % get the parameter of each line | |
| 65 | + value = info.(info_fields{i}); % get the corresponding value of the parameter | |
| 66 | + parameter(strfind(parameter,'_')) = ' '; % change '_' to ' ' | |
| 67 | + line=[parameter,' = ',num2str(value)]; % create the line of the hdr file | |
| 68 | + fprintf(fid,'%s\n',line); % write it to the hdr file | |
| 69 | +end | |
| 70 | + | |
| 71 | +fclose(fid); % clode the header file | |
| 72 | + | |
| 73 | +end | |
| 74 | + | ... | ... |