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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2000, Vol. 1 Issue (3): 264-268    DOI: 10.1631/jzus.2000.0264
Science & Engineering     
FAST ALGORITHM FOR DCT DOMAIN IMAGE UP-CONVERSION
LI Hong-dong, XIE Rong
Dept.of Information and Electronics,Zhejiang University,Hangzhou 310027,China
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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.

Key words： compressed domain process      image up-conversion      JPEG      standard conversion      image interpolation      DCT domain filtering     
Received: 22 May 1999     
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LI Hong-dong
XIE Rong
Cite this article:

LI Hong-dong, XIE Rong. FAST ALGORITHM FOR DCT DOMAIN IMAGE UP-CONVERSION. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2000, 1(3): 264-268.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2000.0264     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2000/V1/I3/264

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