NDLI: Modified cubic convolution scaler for multiformat conversion in a transcoder

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Modified cubic convolution scaler for multiformat conversion in a transcoder

Content Provider	Semantic Scholar
Author	Han, Jong-Ki
Copyright Year	2004
Abstract	Hyung-Myung Kim Korea Advanced Institute of Science and Technology (KAIST) Department of Electrical Engineering 373-1 Kusong-Dong, Yusong-Gu Taejon 305-701 Korea 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, for example, the SD bitstream. The transcoding is performed in spatial domain. 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. The scaling process consists of two steps: fitting the original data with a continuous function, and resampling the function on a new sampling grid. 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. The algorithm exhibits significant improvement in the minimization of information loss when compared with the conventional interpolation algorithms. © 2004 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.1758732]
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://koasas.kaist.ac.kr/bitstream/10203/13087/1/000222641200018.pdf
Language	English
Access Restriction	Open
Subject Keyword	Bitstream Convolution Cubic function Digital Object Identifier Digital image Display resolution Electrical engineering Enlargement procedure Exhibits as Topic HD Term Type Image resolution Image scaling Interpolation Imputation Technique Kernel Moving Picture Experts Group Phelipanche cf. rosmarina Gu 34056 Resampling (statistics) Sampling (signal processing) Scaler Device Component Sensorineural Hearing Loss (disorder) Test scaling algorithm format standards characteristics
Content Type	Text
Resource Type	Article

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