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Journal of Zhejiang University SCIENCE A 2000 Vol.1 No.3 P.264-268

http://doi.org/10.1631/jzus.2000.0264


FAST ALGORITHM FOR DCT DOMAIN IMAGE UP-CONVERSION


Author(s):  LI Hong-dong, XIE Rong(

Affiliation(s):  Dept.of Information and Electronics,Zhejiang University,Hangzhou 310027,China

Corresponding email(s):   lihd@isee.zju.edu.cn

Key Words:  compressed domain process, image up-conversion, JPEG, standard conversion, image interpolation, DCT domain filtering


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LI Hong-dong, XIE Rong(. FAST ALGORITHM FOR DCT DOMAIN IMAGE UP-CONVERSION[J]. Journal of Zhejiang University Science A, 2000, 1(3): 264-268.

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author="LI Hong-dong, XIE Rong(",
journal="Journal of Zhejiang University Science A",
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pages="264-268",
year="2000",
publisher="Zhejiang University Press & Springer",
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}

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Abstract: 
A great number of data associated with visual information requires usage of the popular DCT (Discrete Cosine Transform) compression. This also suggests the investigation of methods for image processing directly in the DCT domain. This paper presents a fast DCT domain image up-conversion algorithm, and a DCT domain linear filter, which only involves matrix manipulations. By using the separate property of certain spatial filters, we accomplish the DCT domain up-conversion via only matrix products. Because 1) most of the matrices can be calculated beforehand, and 2) common DCT blocks are very sparse; and 3) by avoiding the conventional decode and re-encode scheme, the computational complexities are greatly reduced. Experiments on real images show good results.

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Reference

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[2]Assuncao, P.A.A. Ghanbari, M., 1997. Fast computation of MC-DCT for video transcoding. Electronics Letters, 33:284-286.

[3]Chang, S.F. Messerschmitt, D.G., 1995. Manipulation and composing of MC-DCT compressed video. IEEE J-Sel.Area on Commu, 13(1):1-11.

[4]Chiptrasert, B. Rao, K.R., 1990. Discrete cosine transform filtering. Sig.Proc.19(3):233-245.

[5]Merhav, N. Bhaskaran, V., 1996. A fast algorithm for DCT-domain inverse motion compensation, IEEE International Conference on Acoustics. Speech, and Signal Processing, 4(4):2307-2310.

[6]Merhav, N. Bhaskaran, V., 1997. Fast algorithms for DCT domain image down-conversion and for inverse motion compensation. IEEE T- CSVT, 7(3):468-476.

[7]Neri, A. Russo, G. Talone, P., 1994. Inter-block filtering and down conversion in DCT domain. Sig.Proc.:Image Communication, 6:303-317.

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