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为了克服视频解码端时域差错掩盖技术不能准确估计丢失块运动矢量的缺点,提出了一种将解码端运动估计和隐藏运动模型相结合的误码差错掩盖方法。首先,利用丢失块周围正确接收像素估计丢失块运动矢量,并计算估计的准确性。然后根据准确性,通过隐藏运动模型充分利用丢失块的空域和时域相关性进行差错块的掩盖。仿真结果表明,与现有的算法相比,该方法能有效提高重建视频图像质量平均近1dB。
In order to overcome the shortcomings that the error concealment technique in the video decoding side can not accurately estimate the motion vector of the lost block, an error concealment method based on the combination of the motion estimation and the concealed motion model is proposed. First, the missing block motion vector is estimated by correctly receiving pixels around the missing block, and the accuracy of the estimation is calculated. Then according to the accuracy, the hidden motion model is used to cover the error blocks by making full use of the spatial and temporal correlation of the lost blocks. Simulation results show that compared with the existing algorithms, this method can effectively improve the quality of the reconstructed video image by nearly 1dB.