Signal and Data Processing

According to progress of technology during the recent decades, video transmission through a wireless channel has found high demands. In this field, several methods have been proposed to improve video quality. Appearing error in motion vector values is one of the most important factors which can affect the video quality. In case of creating errors in motion vector, the synthesized video frames are moved compared to the previous situation and therefore the synthesized video quality considerably degrades. In this paper, in order to overcome this problem and also to increase PSNR, we propose a method to increase the channel coding rate but transmission rate is maintained constant. In the proposed method, firstly, the motion vector is searched in each block with size of 8*8. After ending the search, the adjacent blocks with the motion vector equals to zero (without movement) are combined together and provide bigger block. Meanwhile, the blocks with equal motion vectors are combined together and transmitted to receiver in two different methods. The experimental results show that the proposed method without increasing side information is able to provide more robustness for video frame against channel errors. The performance of the proposed method has been compared with the new method for different source coding rates and SNRs.