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Modified Cubic Convolution Scaler for Multiformat Conversion in a Transcoder  

Yoo, Young-Joe (세종대학교, 정보통신연구소, 정보통신공학과)
Seo, Ju-Heon (세종대학교, 정보통신연구소, 정보통신공학과)
Han, Jong-Ki (세종대학교, 정보통신연구소, 정보통신공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.32, no.9C, 2007 , pp. 867-880 More about this Journal
Abstract
We derive a modified version of cubic convolution interpolation for the enlargement or reduction of digital images by arbitrary scaling factors. The proposed scaling scheme is used to resize various format pictures in the transcoding system, which transforms the bitstream compressed at a bit rate, such as the HD bitstream, into another bit rate stream. In many applications such as the transcoder, the resolution conversion is very important for changing the image size while the scaled image maintains high quality. We focus on the modification of the scaler kernel according to the relation between formats of the original and the resized image. In the modification, various formats defined in MPEG standards are considered. We show experimental results that demonstrate the effectiveness of the proposed interpolation method.
Keywords
Transcoder; Cubic convolution scaler;
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