Title :
Factorization of nonuniform block orthogonal transforms
Author :
Nagai, Takayuki ; Obata, Shigeki ; Ikehara, Masaaki
Author_Institution :
Dept. of Electr. Eng., Keio Univ., Yokohama, Japan
Abstract :
Block orthogonal transforms (BOTs) are commonly used for lots of applications. Conventional BOTs are based on uniform filter banks, however, nonuniform BOTs are often superior to uniform ones. In this research, we investigate the factorization of nonuniform BOTs which does not involve the tree structure. Therefore, optimal nonuniform BOTs are available in the sense of transform coding gain. Some design examples are included to confirm our theory. We also apply the nonuniform BOT to the transform image coding
Keywords :
digital filters; image coding; matrix decomposition; transform coding; transforms; design examples; factorization; nonuniform block orthogonal transforms; optimal nonuniform BOT; transform coding gain; transform image coding; Filter bank; Frequency conversion; Image coding; Image sampling; Karhunen-Loeve transforms; Pattern recognition; Sampling methods; Testing; Transform coding; Tree data structures;
Conference_Titel :
Acoustics, Speech and Signal Processing, 1998. Proceedings of the 1998 IEEE International Conference on
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-4428-6
DOI :
10.1109/ICASSP.1998.681721
