A study on the Motion Estimation in the MPEG-4 Video Codec using cubic Spline Interpolation

• Main Authors: Chao-Ming, Chen, 陳照明
• Other Authors: Shi-Huang Chen
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/11623118801729782735

碩士 === 樹德科技大學 === 資訊工程學系 === 95 === Multimedia communication has become the main application of modern network system. Among these digital data, the image and video have the greatest data size. Therefore, the image and video compression algorithms are the key points of the multimedia communication system. A well-designed interpolation can reduce image / video data size before compression. It has been shown that the Cubic Spline Interpolation (CSI) is one of the best interpolation algorithms in the world. One of its applications is to cooperate with MPEG-4 video codec and result in a modified CSI_MPEG-4 video codec. It follows from literatures that the reconstructed video quality of the modified CSI_MPEG-4 video codec is better than that of standard MPEG-4 video codec under the same bit-rates. This thesis studies the half/full pixel motion estimation algorithm in the modified CSI_MPEG-4 video codec. The performance of the half/full pixel motion estimation algorithm in the modified CSI_MPEG-4 video codec is evaluated by using various video clips with different resolutions. Experimental results show that the use of half pixel motion estimation algorithm in the modified CSI_MPEG-4 video codec cannot improve video quality substantially as it works in the standard MPEG-4 video codec. Furthermore, the benefit of using half pixel motion estimation will degrade rapidly when the encoded video bit-rate is increased. In other words, it is unnecessary to use half pixel motion estimation in the high bit-rate situations. These results can be applied to set the encoding parameters of the modified CSI_MPEG-4 video codec.