|Title||Reversible N-Bit to N-Bit Integer Haar-Like Transforms
(In Proceedings) |
|in||Proceedings of the 7th IASTED International Conference on Computer Graphics and Imaging|
Joshua Senecal, Mark A. Duchaineau, Ken Joy |
|Keyword(s)||Wavelets, Data Transforms, Haar transform|
We introduce TLHaar, an n–bit to n–bit reversible transform similar to the S–transform. TLHaar uses lookup tables that approximate the S–transform, but reorder the coefficients so they fit into n bits. TLHaar is suited for lossless compression in fixed–width channels, such as digital video channels and graphics hardware frame buffers. Tests indicate that when the incoming image data has lines or hard edges TLHaar coefficients compress better than S– transform coefficients. For other types of image data TLHaar coefficients compress up to 2.5% worse than those of the S–transform, depending on the data and the compression method used.