TY - GEN
T1 - Direction scalability of adaptive directional wavelet transform
T2 - 2010 IEEE International Symposium on Circuits and Systems: Nano-Bio Circuit Fabrics and Systems, ISCAS 2010
AU - Tanaka, Yuichi
AU - Hasegawa, Madoka
AU - Kato, Shigeo
AU - Suzuki, Taizo
AU - Ikehara, Masaaki
PY - 2010/8/31
Y1 - 2010/8/31
N2 - Adaptive directional wavelet transform is an effective alternative of the traditional 2-D wavelet transform for image coding. It is able to transform an image adaptively along diagonal orientations as well as conventional vertical/horizontal directions. However, it requires to transmit transform direction information to the decoder side. For image coding at very low bitrates, the bit budget of the direction information degrades a reconstructed image quality. In this paper, a method to construct a scalable bitstream for transform directions is presented. We utilize the fact that the matrix yielded by transform direction indices still contains the original image characteristics. The matrix is transformed by a block-lifting based DCT, then encoded by SPIHT to yield a scalable bitstream. Our method is effective for very low bitrate image coding, and is comparable to the non-scalable one for middle-to-high bitrates.
AB - Adaptive directional wavelet transform is an effective alternative of the traditional 2-D wavelet transform for image coding. It is able to transform an image adaptively along diagonal orientations as well as conventional vertical/horizontal directions. However, it requires to transmit transform direction information to the decoder side. For image coding at very low bitrates, the bit budget of the direction information degrades a reconstructed image quality. In this paper, a method to construct a scalable bitstream for transform directions is presented. We utilize the fact that the matrix yielded by transform direction indices still contains the original image characteristics. The matrix is transformed by a block-lifting based DCT, then encoded by SPIHT to yield a scalable bitstream. Our method is effective for very low bitrate image coding, and is comparable to the non-scalable one for middle-to-high bitrates.
UR - http://www.scopus.com/inward/record.url?scp=77955991690&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77955991690&partnerID=8YFLogxK
U2 - 10.1109/ISCAS.2010.5537992
DO - 10.1109/ISCAS.2010.5537992
M3 - Conference contribution
AN - SCOPUS:77955991690
SN - 9781424453085
T3 - ISCAS 2010 - 2010 IEEE International Symposium on Circuits and Systems: Nano-Bio Circuit Fabrics and Systems
SP - 3044
EP - 3047
BT - ISCAS 2010 - 2010 IEEE International Symposium on Circuits and Systems
Y2 - 30 May 2010 through 2 June 2010
ER -