Proceedings of the IEEK Conference (대한전자공학회:학술대회논문집)
- 2000.11c
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- Pages.89-92
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- 2000
The Error Concealment Scheme Using DCT Based Image Coding for Mobile Network
무선 네트워크를 위한 DCT 기반의 오류 은닉 기법
Abstract
The wireless network has bursty and high error rates. Due to the quite limited bandwidth in wireless networks, images are usually transmitted as a compressed version with VLC(variable length coding). Loss of coded data can affect a decoded image to a large extent, making concealment of errors caused by data loss an important issue. This paper presents a error concealment technique for DCT(Discrete Cosine Transform) based image coding. First, a method to estimate the missing DC coefficients of a JPEG coded image which is required for decoding the compressed image, is suggested and evaluated. Second, the missing data is interpolated by exploiting the probability of being nonzero and the correlation between adjacent blocks. In addition, since the these technique is computational efficient, it conserves system resources and power consumption, which are restrictive in mobile computers.
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