Motion estimation is an important part of the MPEG- 4 encoder, due to its significant impact on the bit rate and the output quality of the encoder sequence. Unfortunately this feature takes a significant part of the e...Motion estimation is an important part of the MPEG- 4 encoder, due to its significant impact on the bit rate and the output quality of the encoder sequence. Unfortunately this feature takes a significant part of the encoding time especially when the straightforward full search(FS) algorithm is used. In this paper, a new algorithm named diamond block based gradient descent search (DBBGDS) algorithm, which is significantly faster than FS and gives similar quality of the output sequence, is proposed. At the same time, some other algorithms, such as three step search (TSS), improved three step search (ITSS), new three step search (NTSS), four step search (4SS), cellular search (CS) , diamond search (DS) and block based gradient descent search (BBGDS), are adopted and compared with DBBGDS. As the experimental results show, DBBGDS has its own advantages. Although DS has been adopted by the MPEG- 4 VM, its output sequence quality is worse than that of the proposed algorithm while its complexity is similar to the proposed one. Compared with BBGDS, the proposed algorithm can achieve a better output quality.展开更多
阐述了基于片上可编程系统(System on Programmable Chip,SoPC)的视频编码运动估计算法,充分发挥了SoPC系统支持软硬件协同设计的优势,利用FPGA硬件实现较复杂的运动估计算法。用NiosⅡCPU软件编程实现三步搜索算法。实验结果表明,该系...阐述了基于片上可编程系统(System on Programmable Chip,SoPC)的视频编码运动估计算法,充分发挥了SoPC系统支持软硬件协同设计的优势,利用FPGA硬件实现较复杂的运动估计算法。用NiosⅡCPU软件编程实现三步搜索算法。实验结果表明,该系统具有速度快、集成度高、灵活性好等优点,满足了视频压缩应用的实时性要求。展开更多
文摘Motion estimation is an important part of the MPEG- 4 encoder, due to its significant impact on the bit rate and the output quality of the encoder sequence. Unfortunately this feature takes a significant part of the encoding time especially when the straightforward full search(FS) algorithm is used. In this paper, a new algorithm named diamond block based gradient descent search (DBBGDS) algorithm, which is significantly faster than FS and gives similar quality of the output sequence, is proposed. At the same time, some other algorithms, such as three step search (TSS), improved three step search (ITSS), new three step search (NTSS), four step search (4SS), cellular search (CS) , diamond search (DS) and block based gradient descent search (BBGDS), are adopted and compared with DBBGDS. As the experimental results show, DBBGDS has its own advantages. Although DS has been adopted by the MPEG- 4 VM, its output sequence quality is worse than that of the proposed algorithm while its complexity is similar to the proposed one. Compared with BBGDS, the proposed algorithm can achieve a better output quality.
文摘阐述了基于片上可编程系统(System on Programmable Chip,SoPC)的视频编码运动估计算法,充分发挥了SoPC系统支持软硬件协同设计的优势,利用FPGA硬件实现较复杂的运动估计算法。用NiosⅡCPU软件编程实现三步搜索算法。实验结果表明,该系统具有速度快、集成度高、灵活性好等优点,满足了视频压缩应用的实时性要求。
