code speed中文什么意思

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1. The clock obtaining practical circuit in approximately synchronization and clock circuit about symbol synchronization are designed ( realized one circuit ) ; the three controlling circuits with fast and low clock in code speed adjust technique are designed
   在此基础上设计了基于scc准同步的一种时钟恢复实现电路和两种字符型起止式同步电路(实现了一种) 。设计了正码速调整技术中快慢时钟的三种控制电路。
2. In this paper , two important modifications in dct - based coding algorithm are suggested after making deep study on the generally used scheme of h . 263 coder . first , we find plenty of invalid computation in the transformation part of the h . 263 coder and an improved scheme based on the pre - transform decision to avoid invalid computation is proposed . second , in the motion estimation part of the coder , we find that normal search algorithms are not effective , which neglects different levels of motion in image sequences , and we suggest a new search algorithm which has variable search region based on the difference of motion level . combining the pre - transform decision scheme with variable search region method in motion estimation , a global decision coding scheme is provided , which greatly increases the coding speed of h . 263 coder
   本文对h . 263编码算法的现有实现方法作了深入的分析，首先发现变换部分存在大量无效运算，提出了在变换前加判决的前变换判决的编码方案，以压缩无效的变换运算；其次发现运动估计部分由于忽略了图像场景的分级运动而存在一定的无效搜索运算，提出了基于分级运动的可变搜索域法来压缩无效的搜索运算；最后将前变换判决方案与运动估计的可变搜索域法有机地结合在一起，提出了全局判决编码方案，从而比较全面地改进了现有实现方法，因而能大幅度地提高编码器的编码速度
3. Then , in order to reduce the coding time of each image vector , a fast algorithm based on mean - order - search is proposed . the simulation results of this algorithm show that its coding speed is twenty times faster than that of full search algorithm ( fs ) , but its reconstructed image is badly ruined
   其次，为减少每个矢量的编码时间，提出一种基于均值排序码书的快速搜索算法，测试结果显示，该算法编码速度是穷尽搜索算法的二十多倍，但是恢复图像的质量大大地降低了。
4. Generally speaking , a coding algorithm must be low complexity and work at high speed . in this paper , the coding methods are studied to increase coding speed . firstly , a novel method based on temporal prediction to detect all - zero dct coefficients is proposed , which can greatly reduce the coding cost and maintain a good tradeoff between correct detecting ratio and false detecting ratio with little additional computation
   本文以h . 263压缩编码标准为基本框架，针对其中影响压缩效率和速度的瓶颈展开研究，包括快速运动搜索算法的研究、预判零方法的研究以及mmx技术在视频编码中的应用等，提出了一种基于时域预测的预判零新方法，在不影响重建视频质量的条件下具有较高的判别效率，节约了大量dct变换和量化的时间，提高了编码的速度，达到了实时性要求。
5. Finally , basing on the above theory research and the existing hardware scheme , the optimization probabilities is discussed among the layers of the standard entrails , arithmetic promotions and program optimizations . the optimizations are carried out in the software simulation circumstance , and obtain a notable effect , which boosts the coding speed by 60 % with the same image quality , showing an applying prospect
   最后,在以上的理论研究基础上,结合现有的硬件方案,从标准内部、算法改良和程序优化等多个层面上探讨了对视频编解码系统的优化可能,并在软件仿真的环境下付诸于实践,取得了明显的效果,在保证图像质量的前提下,将编码速度提高了约60 % ,显示出了一定的实际应用前景。