Adaptive, non-separable lifting transforms for image compression

In the context of high performance image compression algorithms, such as that emerging as the JPEG 2000 standard, the wavelet transform has demonstrated excellent compression performance with natural images. Like all waveform coding techniques, however, performance suffers in the neighbourhood of oriented edges clad with artificial imagery such as text and graphics. In this paper, we explore some of the opportunities offered by the framework of lifting for developing adaptive wavelet transforms to improve performance under these conditions