The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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$2{\times}2$ DCT-Based Progressive Image Transmission with Spatial and Bit-rate Scalabilities

공간 및 비트율 계위를 갖는 $2{\times}2$ DCT 기반 순차 영상 전송

  • Published : 2000.06.01
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Abstract

In this paper, we propose a multiresolution progressive image transmission with spatial and bit-rate scalabilities using a $2{\times}2$ DCT. The multiresolition image represented by a $2{\times}2$ DCT is used for the progressive image transmission with spatial and bit-rate scalabilities. Because the proposed progressive image transmission method supports both spatial and bit-rate scalabilities, it can be adaptively applied to the receiver's scalability requests. We compare the proposed progressive transmission with that of the higher-order convolution-based Wavelet method. Comparisons show that the proposed method needs much less computations, but insignificant loss of image quality.

본 논문에서는 $2{\times}2$ DCT(Discrete Cosine Transform)와 임베디드 제로 트리(Embedded Zero Tree)를 이용한 공간(Spatial) 및 비트율(bit-rate) 계위(scalability)를 갖는 순차 영상 전송 기법을 제안한다. 제안된 방법은 영상의 다해상도 표현을 위해 $2{\times}2$ DCT를 사용하여 고차 웨이브렛 필터에 비해 계산량이 많이 감소하여 실시간 응용에 적합하도록 하였으며, 공간과 비트율 계위를 동시에 가지도록 하여 수신자의 계위 요구에 적응적으로 대응하도록 하였다. 실험 결과 고차 웨이브렛 필터를 이용한 순차 영상 전송과 비교하여 계산량의 상당한 감소에도 불구하고 화질의 차이는 거의 인식할 수 없었다.

Keywords

References

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