DPCM 영상 부호화기에서 예측 오차를 줄이기 위한 변환된 영상에서의 PRA 적용

Application of PRA to The Differenec Image for Prediction Error Reduction in DPCM Image Coding

This paper propose a conversion method to reduce prediction error produced when PRA(Pel Recursive Algorithm) motion estimation method is used in real image. The method is th get a spatial difference image from a given raw image and then to apply any PRA method to the difference image. The algorithm proposed in this paper is compared with several algorithm including the ubiquitious Netravali and Robbins` based on the performance and the hardware complexity. Computer simulation shows that the difference image conversion method is about 4.5dB better than the other algorithm with regard to prediction error power.