TY - JOUR
T1 - Generalized unequal length lapped orthogonal transform for subband image coding
AU - Nagai, Takayuki
AU - Ikehara, Masaaki
AU - Kaneko, Masahide
N1 - Funding Information:
Manuscript received October 29, 1999; revised August 3, 2000. This work was supported in part by the Ministry of Education, Science, Sports, and Culture, Government of Japan, Encouragement of Young Scientists (A), 11750313, 1999. The associate editor coordinating the review of this paper and approving it for publication was Dr. Paulo J. S. G. Ferreira.
PY - 2000/12
Y1 - 2000/12
N2 - In this paper, generalized linear phase lapped orthogonal transforms with unequal length basis functions (GULLOTs) are considered. The length of each basis of the proposed GULLOT can be different from each other, whereas all the bases of the conventional GenLOT are of equal length. In general, for image coding application, the long basis for a low-frequency band and the short basis for a high-frequency one are desirable to reduce the blocking and the ringing artifact simultaneously. Therefore, the GULLOT is suitable especially for a subband image coding. In order to apply the GULLOT to a subband image coding, we also investigate the size-limited structure to process the finite length signal, which is important in practice. Finally, some design and image coding examples are shown to confirm the validity of the proposed GULLOT.
AB - In this paper, generalized linear phase lapped orthogonal transforms with unequal length basis functions (GULLOTs) are considered. The length of each basis of the proposed GULLOT can be different from each other, whereas all the bases of the conventional GenLOT are of equal length. In general, for image coding application, the long basis for a low-frequency band and the short basis for a high-frequency one are desirable to reduce the blocking and the ringing artifact simultaneously. Therefore, the GULLOT is suitable especially for a subband image coding. In order to apply the GULLOT to a subband image coding, we also investigate the size-limited structure to process the finite length signal, which is important in practice. Finally, some design and image coding examples are shown to confirm the validity of the proposed GULLOT.
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U2 - 10.1109/78.886999
DO - 10.1109/78.886999
M3 - Article
AN - SCOPUS:0034505761
SN - 1053-587X
VL - 48
SP - 3365
EP - 3378
JO - IEEE Transactions on Acoustics, Speech, and Signal Processing
JF - IEEE Transactions on Acoustics, Speech, and Signal Processing
IS - 12
ER -