[WM]: Lossless compression of Binary images..

["Kannan Karthik" <karthik@comm.utoronto.ca>]

Dear Watermarkers,

I am searching for an efficient way to compress small binary images (32 x 32; 64 x 64;) losslessly. The information content in these
binary images is used to decide which blocks within a particular encrypted JPEG image must be decrypted. So the binary image
provides the necessary side information for decrypting another image.

- Compression efficiency is important because this binary image will be embedded in another image as a watermark and then
transmitted.
- Compression has to be lossless to facilitate synchronization.

These binary images are likely to exhibit high spatial correlation. Hence I would like to know if wavelet based techniques can be
used to compress the image losslessly. If so, can anyone suggest a few references.

Can approaches such as runlength coding and minterm reduction be used for lossless compression of these images? How do they compare
with wavelet based approaches?

I would also like to know if the MATLAB code for any of the compression techniques are available on the web.

Thanks in advance.
Karthik

---------------------------
Kannan Karthik (PhD Candidate)
Dept. of Elec and Computer Engg.
University of Toronto
Communications research group
Bahen 4154, 40 St. George Street.
Toronto

Not everything that can be counted counts and not everything that counts can be counted.
- Albert Einstein




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