Arbitrary-ratio image resizing using fast DCT of composite length for DCT based transcoder

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.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2006-02
Language
ENG
Keywords

COMPRESSED DOMAIN

Citation

IEEE TRANSACTIONS ON IMAGE PROCESSING, v.15, pp.494 - 500

ISSN
1057-7149
DOI
10.1109/TIP.2005.863117
URI
http://hdl.handle.net/10203/1022
Appears in Collection
EE-Journal Papers(저널논문)
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