how can i find the compression ratio after running the LZW compression code ?

I did LZW compression on an image. How can i find the compression ration after the completion? knowing that i used the code written here : http://www.mathworks.com/matlabcentral/fileexchange/4899-lzw-compression-algorithm

Answer 1

[Image Analyst]

Look at the size of the file on disk and divide the number of bytes the image variable has in your MATLAB program by that number. For example, the disk file is 200,000 bytes, and the size in MATLAB is 1,000,000 bytes. 1,000,000/200,000 = 5 so the compression ratio is 5 to 1.

[Sanaa Asal]

The code i used does not generate a new image file it builds a table and post the entries. so how can i benefit from that?

[Image Analyst]

I don't know what that means but try "whos" to get the size of the data/table that you think is the compressed version and compare it to the size of the uncompressed version.