Comments on: R2009a – MATLAB updates

By: Kuan

Kuan — Mon, 05 Jul 2010 19:15:20 +0000

To Silas Leavesley: to write array data into ENVI format is very simple. But the lines and samples in ENVI are the samples and lines in Matlab. Just a transpose command will solve it. I have an m-file which might help you. It writes multi-spectral images. For reading ENVI files I have another function which is too long to post here. Enjoy. Kuan

function write_envi_data(data,envifile,fname)
%%write data into envi format
%%Kuan June 15, 2006

fid=fopen(fname,'wb');
if envifile.datatype==1
    readdatatype='uint8';
end
if envifile.datatype==2
    readdatatype='uint16';
end
if envifile.datatype==3
    readdatatype='int32';
end
if envifile.datatype==4
    readdatatype='single'; %%This needs to be tested
end
if envifile.datatype==5
    readdatatype='double'; %%This needs to be tested
end
if envifile.datatype==12
    readdatatype='uint16';
end
if envifile.datatype==13
    readdatatype='uint32';
end
if envifile.datatype==14
    readdatatype='int64';
end
if envifile.datatype==15
    readdatatype='uint64';
end
for i=1:size(data,3)
    newdata(:,:,i)=transpose(data(:,:,i));
end
clear data;
fwrite(fid,newdata,readdatatype);
fclose(fid);
fid=fopen(strcat(fname,'.hdr'),'wb');
fprintf(fid,'%s\n','ENVI');
fprintf(fid,'%s','description = ');
fprintf(fid,'%s\n',123);
fprintf(fid,'%s','Kuan Song file output from Matlab to ENVI');
fprintf(fid,'%s\n',125);
fprintf(fid,'%s %d\n','samples = ',envifile.samples);
fprintf(fid,'%s %d\n','lines = ',envifile.lines);
fprintf(fid,'%s %d\n','bands = ',envifile.bands);
fprintf(fid,'%s %d\n','data type = ',envifile.datatype);
fprintf(fid,'%s %d\n','header offset = ',0);
fprintf(fid,'%s \n','interleave = bsq');
fprintf(fid,'%s \n','byte order = 0');
fprintf(fid,'%s','file type = ENVI standard');

fclose(fid);

By: Silas Leavesley

Silas Leavesley — Fri, 04 Jun 2010 02:08:27 +0000

Hi Steve,

I’m using MATLAB to process some multipage spectral image sets. I want to import these into ENVI, but I can’t seem to get the formatting correct (driving me nuts). I’m no expert at header formats, but I used AsTiffTagViewer to get info about the file. There’s a couple small differences (I can post header info if that would help). Can we edit the contents of the header info from MATLAB?

Thanks!

-Silas

By: Steve

Steve — Wed, 04 Nov 2009 13:45:46 +0000

Grant—Sorry, but it won’t be for R2010a. That development deadline has already passed.

By: Grant

Grant — Tue, 03 Nov 2009 02:24:58 +0000

Oh no, I’m definitely not feeling that ambitious, but I’ll be keeping my otherwise busy fingers crossed for a fortuitous union of libtiff 4.0 RC and 2010a!

By: Steve

Steve — Tue, 03 Nov 2009 00:40:52 +0000

Grant—No, bigtiff is not supported. You could try writing your own code against libtiff 4.0 if you’re feeling ambitious. This version of the library is still in beta test, which is why we haven’t incorporated it into MATLAB yet.

By: Grant

Grant — Tue, 03 Nov 2009 00:23:20 +0000

I’m still unclear, is there a way to support bigtiff in 2009b or not?

Even if it’s not officially supported, can I wrangle with libtiff (from Aperio or the bigtiff project) in some way?

I’d love to hear from anyone who’s been successful with this

By: Steve

Steve — Thu, 09 Jul 2009 13:54:59 +0000

Siddharth&Sorry about my confusion.

By: Siddharth

Siddharth — Thu, 09 Jul 2009 13:43:10 +0000

This is once again the svs file I referred to earlier. (http://blogs.mathworks.com/steve/2009/03/18/r2009a-matlab-updates/#comment-21577)

If you were asking about the release notes, I saw them when I used the Help->Check for updates menu option in MATLAB.

By: Steve

Steve — Wed, 08 Jul 2009 11:36:35 +0000

Richard—As far as I know, we don’t maintain documentation for old versions online. You should have it in your installation, though. Or you could use the online version and check the release notes to see what has changed.

By: Richard

Richard — Wed, 08 Jul 2009 01:07:49 +0000

Hi Steve,

where can i get a softcopy of the user’s guide for the image processing toolbox 6.2? Last time i checked on the Mathworks site what they have was the user guide for version 6.3.

thanks