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변형된 3차 함수와 DCT-IF를 이용한 적응적 화면내 예측 방법
이한식(Han Sik Lee),이주옥(Ju Ock Lee),문주희(Joo-Hee Moon) 한국방송·미디어공학회 2012 방송공학회논문지 Vol.17 No.5
In current HEVC, prediction pixels are finally calculated by linear-function interpolation on two reference pixels. It is hard to expect good performance on the case of occurring large difference between two reference pixels. This paper decides more accurate prediction pixel values than current HEVC using linear function. While existing prediction process only uses two reference pixels, proposed method uses DCT-IF. DCT-IF analyses frequency characteristics of more than two reference pixels in frequency domain. And proposed method calculates prediction value adaptively by using linear-function, DCT-IF and cubic-function to decide more accurate interpolation value than to only use linear function. Cubic-function has a steep slope than linear-function. So, using cubic-function is utilized on edge in prediction unit. The complexity of encoder and decoder in HM6.0 has increased 3% and 1%, respectively. BD-rate has decreased 0.4% in luma signal Y, 0.3% in chroma signal U and 0.3% in chroma signal V in average. Through this experiment, proposed adaptive intra prediction method using DCT-IF and cubic-function shows increased performance than HM6.0.
이한식 ( Han Sik Lee ) 충북대학교 산업과학기술연구소 1990 산업과학기술연구 논문집 Vol.4 No.2
Abstract_Roman Detection of object boundaries is an important part of the perception procees. There is mucb psychological evidence, that boundaries are eufficient for perception of a broad class of objects. In this paper, we wi)1 be discussed detecting b