Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Priority based Image Transmission Technique with DPCM in Wireless Multimedia

무선 멀티미디어 센서 네트워크에서 예측부호화를 통한 우선순위 기반 이미지 전송 기법

  • 이좌형 (강원대학교 컴퓨터정보통신공학과) ;
  • 정인범 (강원대학교 컴퓨터정보통신공학과)
  • Received : 2009.10.13
  • Accepted : 2009.12.11
  • Published : 2010.04.30
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Abstract

With recent advances in hardware and wireless communication techniques, wireless multimedia sensor network which collects multimedia data through wireless sensor network has started to receive a lot of attentions from many researchers. Wireless multimedia sensor network requires a research of efficient compression and transmission to process the multimedia data which has large size, in the wireless sensor network that has very low network bandwidth. In this paper, we propose PIT protocol for the transmission based on the priority that classified by the DPCM compression. The PIT protocol sets different priority to the each subbands which are divided by the wavelet transform. The PIT protocol transmits the data with higher priority to guarantee the high image quality. The PIT protocol uses the characteristic of wavelet transform that the transformed image is very insensible to the data loss. In PIT protocol, each subbands of wavelet transformed image has fair weight in the compressed image to utilize the prioriy based transmission. The experiment results show that the PIT protocol improves the quality of image in spite of data loss.

최근 하드웨어와 무선 통신 기술의 발달로 무선 센서네트워크를 이용하여 멀티미디어 데이터를 수집하기 위한 무선 멀티미디어 센서네트워크에 관한 연구가 활발히 이루어지고 있다. 많은 데이터를 갖는 멀티미디어 데이터를 네트워크 대역폭이 극히 낮은 무선 센서 네트워크에서 처리하기 위해서는 네트워크 상태에 따른 효율적인 데이터 압축과 전송에 관한 연구가 필요하다. 본 논문에서는 무선 센서네트워크에서 대표적인 멀티미디어 데이터인 이미지 데이터를 예측부호화를 통해 압축된 이미지를 우선순위에 기반하여 전송하기 위한 이미지 전송 기법(Priority based Image Transmission Technique With Wavelet Transform)을 제안한다. 제안하는 PIT 기법은 이미지의 웨이블릿 변환을 통하여 나누어진 영역별로 서로 다른 우선순위를 설정한다. PIT기법은 패킷의 우선순위에 따라 전달 여부를 결정하도록 하여 중요한 데이터일수록 전송이 성공할 가능성을 높인다. PIT기법은 웨이블릿 변환의 특성상 데이터의 일부가 손실되더라도 최대한 전체적인 내용을 파악할 수 있는 장점을 활용한다. PIT에서는 연속적인 이미지 사이의 유사성을 고려한 저주파수 영역에서의 예측부호화(DPCM)을 통하여 이미지 데이터가 우선순위별로 균등하게 분포시킴으로써 화질열화를 최소화한다. 실험을 통하여 제안하는 기법이 데이터가 손실되더라도 높은 화질을 보장함을 보인다.

Keywords

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