Research On Frame Rate Up Conversion Based On Symmetrical Motion Compensation Interpolation

With the development of information technology, multimedia communication has gradually become an important part of human life. Multimedia data, which always need a great amount of data, in order to satisfy the requirements of storage and transmission, must be compressed. Although today's video compression standards can provide a high compression ratio, for some limited transmission bandwidth of occasions, new techniques are still needed to provide sufficient low bit-rate. At present, low bit rate coding techniques are usually based on two ideas, that is, to reduce the temporal resolution or the spatial resolution. One can send the video at full frame rate where the quality is degraded by annoying blocking artifacts. Alternatively, the frame rate may be reduced to 15 or 10 frame per second (fps) where each frame has better video quality. Under such circumstances, the introduction of a frame rate up conversion mechanism which allows decoding sequence restored to the original frame rate is very necessary.This thesis introduces the key technologies and the commonly used video coding standards, and then describes in detail on the current frame rate up conversion (FRUC) technology research and representatives of the algorithm. A new FRUC algorithm based on symmetrical motion compensation interpolation (SMCI) is proposed, which can avoid overlapping pixels and hole region brought by traditional motion compensation interpolation. At the same time, in response to strenuous motion and scene changing, a motion compensation extrapolation method is put forward to solve blur and error problems when using the interpolation algorithm.In addition, in reference to the shot change detection theory, the thesis also proposes a shot shift detection and recovery algorithm based on the compressed domain. The shot shift can be detected by the statistics of motion vectors, intra-block distribution, predicted residuals and other related information got from the bit-stream, so that the new frame inserted can achieve better subjective and objective results.