CAJ | 학술논문

提出了可以用于H.264/AVC解码器的基于场景变换检测的错误隐藏机制,首先利用H.264/AVC的快速准确的检测是否发生场景切换,根据场景切换检测结果对预测帧和I帧分别提出相应的时间空间自适应的错误隐藏方法. 实验结果表明,所提方法在错误隐藏的重构图像质量在主观感觉和客观PSNR定量上,都比通常的方法有明显的提高;与传统错误隐藏方法相比,本文的基于场景切换检测的错误隐藏机制鲁棒性高,更能适应的H.264/AVC更为复杂的多种应用场合.
제출료가이용우H.264/AVC해마기적기우장경변환검측적착오은장궤제,수선이용H.264/AVC적쾌속준학적검측시부발생장경절환,근거장경절환검측결과대예측정화I정분별제출상응적시간공간자괄응적착오은장방법. 실험결과표명,소제방법재착오은장적중구도상질량재주관감각화객관PSNR정량상,도비통상적방법유명현적제고;여전통착오은장방법상비,본문적기우장경절환검측적착오은장궤제로봉성고,경능괄응적H.264/AVC경위복잡적다충응용장합.
Conventional temporal error concealment method will become ineffective for corrupt macroblocks (MBs) once scene changes occur in video sequences. In this paper, we propose a scene change detection based error concealment methodology for H.264/AVC. We use the encoding mode information of macroblocks in a frame to detect the scene change for inter frames. Then a method to detect scene change for intra frames is proposed. Based on the new characters of H.264/AVC and the results of presented scene change detection, the block based temporal concealment with boundary match criteria and spatial error concealment scheme is adaptively adopted for inter and intra frames. The proposed methodology can make use of the available redundancy in bit streams as possible. A new video sequence with several scene changes is created, and its simulation results demonstrate the robustness of the proposed methodology and its considerable improvement in visual quality of reconstructed pictures.