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학술지 Error Concealment Using Intra-Mode Information Included in H.264/AVC-Coded Bitstream
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김동형, 정세윤, 최진수, 전광길, 김승종, 정제창
ETRI Journal, v.30 no.4, pp.506-515
한국전자통신연구원 (ETRI)
The H.264/AVC standard has adopted new coding tools such as ultra-prediction, variable block size, motion estimation with quarter-pixel-accuracy, loop filter, and so on. The adoption of these tools enables an H.264/AVC-coded bitstream to have more information than was possible with previous standards. In this paper, we propose an effective spatial error concealment method with low complexity in H.264/AVC intra-frame. From information included in an H.264/AVC-coded bitstream, we use prediction modes of intra-blocks to recover a damaged block. This is because the prediction direction in each prediction mode is highly correlated to the edge direction. We first estimate the edge direction of a damaged block using the prediction modes of the intra-blocks adjacent to a damaged block and classify the area inside the damaged block into edge and flat areas. Our method then recovers pixel values in the edge area using edge-directed interpolation, and recovers pixel values in the flat area using weighted interpolation. Simulation results show that the proposed method yields better video quality than conventional approaches.
KSP 제안 키워드
Coding Tools, Edge direction, Edge-directed interpolation, Motion estimation(ME), Pixel Value, Prediction mode, Spatial error concealment, Variable Block Size(VBS), Video quality, Weighted interpolation, intra-frame