DocumentCode :
793761
Title :
Arbitrary-ratio image resizing using fast DCT of composite length for DCT-based transcoder
Author :
Park, Young Seo ; Park, Hyun Wook
Author_Institution :
Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea
Volume :
15
Issue :
2
fYear :
2006
Firstpage :
494
Lastpage :
500
Abstract :
We propose a fast arbitrary-ratio image resizing method for transcoding of the compressed images. The downsizing process in the discrete cosine transform (DCT) domain can be implemented by truncating high-frequency coefficients, whereas the upsizing process is implemented in the DCT domain by padding zero coefficients to the high-frequency part. The proposed method combines a fast inverse and forward DCT of composite length for arbitrary-ratio upsizing or downsizing. According to the resizing ratio, truncating the high-frequency coefficients and padding zeros are appropriately considered by combining the inverse DCT and forward DCT. The proposed method shows a good peak signal-to-noise ratio and less computational complexity compared with the spatial-domain and previous DCT-domain image resizing methods.
Keywords :
data compression; discrete cosine transforms; image coding; image reconstruction; transcoding; arbitrary ratio image resizing; discrete cosine transform; image compression; transcoding; Computational complexity; Computational efficiency; Digital signal processing; Discrete cosine transforms; Image coding; Image quality; PSNR; Streaming media; Transcoding; Video compression; Arbitrary-ratio image resizing; composite length DCT; transcoder; Algorithms; Artificial Intelligence; Computer Communication Networks; Image Enhancement; Image Interpretation, Computer-Assisted; Information Storage and Retrieval; Numerical Analysis, Computer-Assisted; Signal Processing, Computer-Assisted; Video Recording;
fLanguage :
English
Journal_Title :
Image Processing, IEEE Transactions on
Publisher :
ieee
ISSN :
1057-7149
Type :
jour
DOI :
10.1109/TIP.2005.863117
Filename :
1576822
Link To Document :
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