Adaptive directional zerotree image coding
S. Jirachawang, Vutipong Areekul · 2003
In this paper, adaptive directional zerotree image coding is introduced. This modified SPIHT algorithm called adaptive directional SPIRT (ADSPIHT) exploits an appropriate quadtree structure in order to take advantage from horizontal and vertical edge encoding in separable wavelet transform. Moreover, this adaptive algorithm changes structure in order to enhance energy compaction without increasing side information rate. Compared to SPIRT and DSPIHT, ADSPIHT improves coding performance in PSNR, especially in images with highly vertical and horizontal edges.