How can i compress the text file using huffman encoding?

Hi

I am using a text file to hide inside an image file in lsb plane. But i want to compress the text file using huffman encoding and hide inside the lsb plane of image file. After retrieve the text file, the text file should be decompressed using huffman encoding.

Can you help in this matter.

[Prakruthi gowda]

Hi I took steganography as my project using lsb and lsb+huffman coding can anyone help me with correct matlab codes for encoding and decoding and mail me @[e-mail]

Answer 1

[Massimo Zanetti]

Refer to this help page.

http://it.mathworks.com/help/comm/ref/huffmanenco.html

[Sanjeeb Behera]

Thank u for ur immediate reply

Thanks a lot

[Massimo Zanetti]

If it helped you, please accept this answer.

Answer 2

[Walter Roberson]

https://www.mathworks.com/matlabcentral/fileexchange/4900-huffman-code

[Sanjeeb Behera]

Thank u for ur response.

The link which is provided by u, already i have the huffman code file. But i can't understand. So could you give me some another link so that it is easier to me to solve the problem.

Thanks a lot.

[Walter Roberson]

Not without a more specific question, No.

You would never hide data into the compressed data: if you did that then you might not be able to uncompress it. You would hide the data before you compressed, and then you compress.

There are over 200 posts on steganography, many of them with code.

http://www.mathworks.com/matlabcentral/answers/?term=tag%3A%22steganography%22

[Sanjeeb Behera]

Hi

My question is to compress large size of text file and hide inside an image using lsb technique.

I have already done the embedding the text file into the lsb plane of an image. But i want to increase the capacity of text file and compress it and then embed it in an image.

[Walter Roberson]

So you use https://www.mathworks.com/matlabcentral/fileexchange/4900-huffman-code to do the Huffman compression and then you do the data hiding. What is your question?

[Sanjeeb Behera]

My question is to compressed a text file then hide compressed file inside an image.

[Walter Roberson]

Step 1: read the text file

Step 2: call a huffman compression algorithm to produce a compressed version of the file

Step 3: convert the compressed data to binary

Step 4: hide the binary inside an image

Step 5: save the image.

[Sanjeeb Behera]

Hi

Yes i have done this through a existing code. But output of the execution is not clear.

Here i have mentioned which i have used https://in.mathworks.com/matlabcentral/fileexchange/7725-huffman-coding-and-decoding-for-text-compression

[Walter Roberson]

The output of the execution of what is not clear? Please clarify what you mean by not clear.

[Sanjeeb Behera]

Here i have given execution code of above program

At first it require to read the file i.e paper4

Then it needs to enter the destination huffman code file name: paper5

Enter huffman table: table

Enter the destination file: paperx

paper5, table and paperx file created but no data is saved in this file.

So can u help me, how can i get correct result?

Answer 3

[Usairum Mirza]

A simple and easy way for encoding and decoding with a text file is give below:(We have used huffman functions in this code).

keep in mind make your text file in capital letters and with no nex line or comms or fullstop

[Ateeb Khawaja]

but in this code Encoding is not mentioned. its only decoding

[Usairum Mirza]

By making a dictionay assigning their probabilities and using huffman commands like huffman enco this is where encoding part is. Also after running we can see the compression ratio or number of bits that are compressed just look it up.

Answer 4

[Sai Sriram Sunkavalli]

Consider the given file(James C. Maxwell.docx). Compute the probabilities of alphabet and number (ratio of the number of occurrences to the total count of alphabets and numerals) and create a table with symbols and probabilities. Determine the Huffman code for the symbols and create the table of symbols and Huffman codewords. Using the above constructed table encode your name and Roll number.

James C. Maxwell.docx

[Walter Roberson]

This does not appear to be an Answer to the Question?