An improved DVC scheme based on motion activity classification

In this paper, an improved DVC scheme that uses backward channel aware motion estimation is presented. A novel key frame coding method and a macroblock classification method are proposed, which are based on motion activity classification. Then, these methods then are used for mode-decision of switch motion estimation method at the decoder. We further present a 3DRS motion estimation based on motion activity classification to improve the accuracy of reconstructed key frames and reduce the complexity of our DVC scheme. The experimental results confirm our analyzing results and show that our coding scheme can achieve significant coding efficiency gain compared with state-of-the-art distributed video codec while still keeping low encoding complexity.