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Enlargement and reduction of image/video via discrete cosine transform pair, part 2: reduction

[+] Author Affiliations
Shu-Mei Guo

National Cheng Kung University, Department of Computer Science and Information Engineering, Tainan, Taiwan

Chen-Bang Li

National Cheng Kung University, Department of Computer Science and Information Engineering, Tainan, Taiwan

Chia-Wei Chen

Kao Yuan University, Department of Mechanical and Automation Engineering, Lujhu Township, Kaohsiung, Taiwan

Yueh-Ching Liao

National Cheng Kung University, Department of Computer Science and Information Engineering, Tainan, Taiwan

Jason Sheng-Hong Tsai

National Cheng Kung University, Department of Electric Engineering, Tainan, Taiwan

J. Electron. Imaging. 16(4), 043007 (December 07, 2007). doi:10.1117/1.2804712
History: Received October 02, 2006; Revised April 18, 2007; Accepted May 31, 2007; Published December 07, 2007
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Based on the novel matrix representations of the forward three-dimensional (3-D) discrete cosine transform (DCT) and the inverse 3-D DCT, applications for reduction of sequence/image/video are proposed. The original sequence/image/video is divided into subunits, and then the reduction is implemented in the frequency-domain by DCT. Two efficient algorithms are presented in accordance with two kinds of reducing multiples, 1s and o1o2, respectively. The proposed algorithms significantly eliminate ripple and blocky effects. As a result, they can provide numerous applications in data compression as well. Simulation results show that proposed mechanisms enable good performances for reductions of sequences, images, and videos as expected.

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© 2007 SPIE and IS&T

Topics

Video ; Matrices

Citation

Shu-Mei Guo ; Chen-Bang Li ; Chia-Wei Chen ; Yueh-Ching Liao and Jason Sheng-Hong Tsai
"Enlargement and reduction of image/video via discrete cosine transform pair, part 2: reduction", J. Electron. Imaging. 16(4), 043007 (December 07, 2007). ; http://dx.doi.org/10.1117/1.2804712


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