Sung Hoon Jeon , Jae Myeong Yoo , Guee Sang Lee

The KIPS Transactions:PartB , Vol. 13, No. 3, pp. 197-204, Jun. 2006
10.3745/KIPSTB.2006.13.3.197,   PDF Download:

Abstract

Recent advances in information technology have resulted in rapid growth in the mobile communication. With this explosive growth, reliable transmission and error concealment technique become increasingly important to offer high quality multimedia services. In this paper, we propose an improved BMA(Boundary Matching Algorithm) method using gradient vectors to conceal channel errors in inter-frames of H.264 video images. General BMA method computes the sum of pixel differences of adjacent pixels of the candidate block and its neighbouring blocks, assuming that adjacent pixels have almost the same value. In real images, however, there exist some gradients, which means that the pixel values are increasing or decreasing in a specific direction. In this paper, we develop a precise estimation method of errors in candidates blocks using gradient information and try to recover lost blocks with this technique. Experimental results show the improvement of picture quality about 1～3dB compared to existing methods

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