Communication & Signal Processing
Lossless Data Compression
- Multi-layered schemes in MIMO systems
- OFDM for Cooperative Networks
- Radar Imaging
- 50% Efficient Solar Cells
- Capacity optimization
- Channel coding for non-standard channels with memory
- Exploiting Diversity in Wireless Networks
- Image Compression
- Low-density generator matrix codes
- Message Authentication in Noisy Environments
- Multi-tone blue noise dithering
- Inverse Lithography
- Space-time/frequency coding for MIMO and cooperative communications systems
- Steganalysis of Digital Images and Videos
- Turbo-like codes for distributed source and joint source-channel coding
- Compressive sensing in imaging, sensor networks, and UWB radios
- Lossless Data Compression
Lisa Marvel, Army Research Laboratory
A long term research interest is in lossless data compression, both theoretically and in specific applications, such as lossless image compression.
We have developed new methods for entropy compression (block arithmetic coding) and several new methods for image compression. In recent image compression work, we have invented the Med-Bzip2 and the BCTW methods.
Med-Bzip2 is meant as a simple, but general purpose, lossless image compressor. It is very easy to program, yet achieves compression ratios about 10% better than JPEG-LS (the best standard for lossless image compression).
BCTW is a bitplane by bitplane compression method that achieves compression ratios about 15% better than JPEG-LS (on mixed suites of images, but not necessarily on each image). This performance is state of the art. BCTW has recently been used as a core technology in our image stegnalaysis work.
"On the Use of Context Weighting in Lossless Bilevel Image Compression," S. Xiao and C. G. Boncelet Jr., IEEE Trans. on Image Processing, November 2006.
"Lossless Image Compression with BCTW," C. G. Boncelet Jr., Proceedings of the IEEE International Conference on Image Processing, October 2006.
"Simple, High Performance Lossless Image Compression," C. G. Boncelet Jr., Proc. IEEE ICIP Conference, Thessaloniki, Greece, October 2001.