DocumentCode :
2159591
Title :
Integer fast lapped orthogonal transform based on direct-lifting of dcts for lossless-to-lossy image coding
Author :
Suzuki, Taizo ; Ikehara, Masaaki
Author_Institution :
Dept. of Electron. & Electr. Eng., Keio Univ., Yokohama, Japan
fYear :
2011
fDate :
22-27 May 2011
Firstpage :
1525
Lastpage :
1528
Abstract :
Integer lapped orthogonal transforms (LOTs) are vital technologies for the unification of lossless and lossy image coding, called lossless to-lossy image coding. In this paper, we present an efficient realization of integer fast LOT (FLOT) based on direct-lifting of discrete cosine transforms (DCTs) which are type-II, III and IV. Although the conventional integer FLOTs suffer from degradation of coding performance due to much rounding error generated by cascading lifting structures, this paper presents a realization of a simpler, faster and more efficient transform with only some adders, 1-bit shifters and direct use of DCTs for lifting coefficients. As result, the proposed method is validated in lossless-to-lossy image coding.
Keywords :
image coding; transforms; DCTS; conventional integer FLOT; integer fast LOT; integer fast lapped orthogonal transform; lossless-to-lossy image coding; word length 1 bit; Adders; Bit rate; Boats; Discrete cosine transforms; Image coding; Transform coding; Direct-lifting; discrete cosine transform (DCT); fast lapped orthogonal transform (FLOT); lossless-to-lossy image coding;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech and Signal Processing (ICASSP), 2011 IEEE International Conference on
Conference_Location :
Prague
ISSN :
1520-6149
Print_ISBN :
978-1-4577-0538-0
Electronic_ISBN :
1520-6149
Type :
conf
DOI :
10.1109/ICASSP.2011.5946784
Filename :
5946784
Link To Document :
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