Error while using JBIG compression.

I need to compression a binary image(matrix of size RxC) in a lossless manner. For this I hope I can use JBIG compression, and I have downloaded the toolbox from the following link.

https://in.mathworks.com/matlabcentral/fileexchange/5104-toolbox-wavelets/content/toolbox_wavelets/perform_jbig_coding.m

I added the extracted folder to Matlab path, and I tried to call the perform_jbig_coding function in the following way

[y, nbr_bits]=perform_jbig_coding(x);

please note that x I defined as a random binary matrix of size 256x256 bits.

But while using this I am getting the following error :

_ _ 'pbmtojbg' is not recognized as an internal or external command, operable program or batch file. Error using perform_jbig_coding (line 22) Unable to open Jbig file.__

Anyone can help me to resolve this error? or Anybody can share the JBIG pure matlab code for compression and decompression?

[Pengfei]

Hello, have you implemented JBIG compression and decompression? I am currently struggling with these two issues

Answer 1

[Alejandro Peñuelas]

Hi. Probably it is too late but this answer could be useful for other Matlab users.

Specifically for this situation, inside the function that you mentioned, the code calls two external programs 'pbmtojbg.exe' and 'jbgtopbm.exe'. The header of the function says: "It requires pbmtojbg and jbgtopbm executable." that can be generated running the make fine contained in the JBIG-KIT library that can be found at: JBIG-KIT.

Instructions to generate those executables can be found at: JBIG-KIT Instructions.

I hope this information can help someone and, if you need help, you can ask anything. This process helped me to use the jbigkit library and the mentioned function in my matlab projects.

[sahil sharma]

After generating the executable what procedure has to be followed, as I have generated the executable and placed them in the same folder as my .m file how ever the function does not seem to catch it up.

[Alejandro Peñuelas]

Did you check this: https://la.mathworks.com/matlabcentral/fileexchange/5104-toolbox-wavelets ?

[sahil sharma]

Yes, I did tried to run the perform_jbig_coding function from the link by adding the executable in the same folder as the function. But the function is not able to open the folder.

Also in the toolbox they have not mentioned how to even use the function.

[Alejandro Peñuelas]

I know, it was pretty difficult for me to use it altogether years ago. Can you share the piece of code where you use it please? I think I can be helpul if you show me your code. Also add the error messages please.

[sahil sharma]

clear;

clc;

I = double(imbinarize(im2gray(imread("original.jpg"))));

[y,nbr_bits] = perform_jbig_coding(I);

I am just calling the function and I am getting this error:

zsh:1: command not found: pbmtojbg

Error using perform_jbig_coding

Unable to open Jbig file.

Error in Main (line 4)

[y,nbr_bits] = perform_jbig_coding(I);

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Main is the file name calling the perform_jbig_coding function.

I have saved all the function in a same folder: Main.m, perform_jbig_coding.m, jbgtopbm (as unix executable file) and pbmtojbg (as unix executable file)

After I run the program my image "original.jpb" is converting into b.pbm, however after that the error occurs. I am also pasting the perform_jbig_coding.m code:

function [y,nbr_bits] = perform_jbig_coding(x)

% perform_jbig_coding - perform binary image coding

%

% [y,nbr_bits] = perform_jbig_coding(x);

%

% It requires pbmtojbg and jbgtopbm executable.

%

% Copyright (c) 2006 Gabriel Peyr

name_pbm = 'b.pbm';

name_jbg = 'c.jbg';

if size(x,1)>1 && size(x,2)>1

% forward transform

% save as pbm

imwrite(rescale(x), name_pbm, 'pbm');

% convert to jgib

!pbmtojbg tmp.pbm tmp.jbg

% read jbig file

fid = fopen(name_jbg);

if fid<0

error('Unable to open Jbig file.');<== It is here my program is ending

end

[y,cnt] = fread(fid, Inf);

fclose(fid);

nbr_bits = length(y)*8;

% remove tmp files

!del tmp.jbg

!del tmp.pbm

else

% backward transform

fid = fopen(name_jbg, 'wb');

if fid<0

error('Unable to open Jbig file.');

end

fwrite(fid, x);

fclose(fid);

% convert to pbm

!jbgtopbm tmp.jbg tmp.pbm

% read pbm

y = imread(name_pbm);

% remove tmp files

!del tmp.jbg

!del tmp.pbm

nbr_bits = -1;

end

[sahil sharma]

Also if you can remember how were you able to run the program it would be very helpful.