rating n. 1.分等级;定等级;估价;估计;分摊,分配;【电学】测定,计算;〔美国〕(考试的)批分数。 2.额定值,定额;参量;工作能力;(商店的)信用程度;〔英国〕地方税征收额。 3.【航海】(船舰或海员的)等级;(汽车等的)规格;〔pl.〕〔英国〕刚入伍的船员。 4.(电台、电视台经调查确定的)节目受欢迎的程度。 a nominal rating 标准规格。 a power rating 额定功率。 n. 叱责,斥责。 give a sound rating 严厉申斥一顿。
With performance of up to 900 million floating - point operations per second ( mflops ) at a clock rate of 150 mhz , tms320c6711 is fit to tackle with the problem . this thesis made a deep research on the h . 263 standard and the tms320c6711 . we propose the plan of the software and the hardware for the realization of the h . 263 protocol which include the structure of the whole program , the c code of the key algorithm of the h . 263 , the c code of some subprogram , and the circuit for image processing with the tms320c6711 as the processor . furthermore , we optimize some subprogram in common use to make the coding more quickly . we encode a video sequence with the tms320c6711dsk successfully , even if the compression rate is as high as 100 , video effect we get after decoding the code stream is satisfying 首先系统地研究了h . 263协议编码器的基本算法,句法,码流结构和tms320c6711dsk的原理结构以及ccs2 . 0的开发环境;在系统的软件方面给出了总体流程图,对于h . 263协议编码器的某些核心算法和子程序,给出了部分源代码,对于dsp的各种代码优化方法进行了讨论,并且对代码进行优化,从而在提高系统处理速度的同时减少代码大小和内存需求量;硬件方面以tms320c6711为核心处理器,提出了基于tms320c6711的图像处理平台的硬件实现方案,并给出了原理电路图;最后在tms320c6711dsk上成功对视频数据进行高压缩比( 100倍以上)的编码,对回传的结果解码后得到了令人满意的效果。
Abstract : in this article , the way of dynamics system dispensation in radio telecontrolling model plan is illustrated , and a comparative ananysis is given to the adjustment of the engine ' s compression rate as well as the performance of different - sized propellers , likewise , any other factors which affect the performance of the dynamics system capacity are also analized and disoussed 文摘:本文论述了遥控模型飞机动力系统的调配方法,并对发动机压缩比的调整和不同规格螺旋桨的性能进行了分析比较,对影响动力系统功率发挥的其他因素也进行了分析讨论。
In order to improve efficiency of scientific data storage and transportation , scientific data compression rate prediction method based on genetic algorithm is proposed , and association rule is used to evaluate its training result to find out whether the method is applicable to certain given scientific data 为了提高科学数据存储和传输的效率,本文提出一种基于遗传算法的科学数据压缩率预测方法。为检验本方法对给定的科学数据的效果,关联规则被用于科学数据压缩率预测的训练结果评估。
The paper includes two main initiations . one is employing the method of segmentation before compression , which is benefit to a more effective compression according to the characteristics of scanned document image . another is combining roi and progressive transmission , in which makes the compression rate and transmission performance reach the best balance 该论文的主要创新点有两个:一个是在图像压缩之前采用了图像分割的方法,有利于更好的针对图像的自身特点对之进行有效的压缩;另一个是采用了一种结合兴趣域和渐进传输的扫描文档图像的压缩和传输方法,使得图像的压缩比和传输性能达到最好的平衡。
Text is a kind of very common resource in digital library , and lossless techniques play an important role in compressing text . starting from the shannon ' s entropy theory , we analyze the lossless compression algorithms , and implement arithmetic coding algorithm in c . in the experiments , we compare four different lossless compression algorithms by their performances such as compression rate , compression rate tendency with the length of data , stability , and complexity , using 35 groups data series with 4 different length 本文从信息论中shannon熵定理出发,对无损压缩技术进行系统地分析,用c语言实现了其中的算术编码算法,并用它对35组、四种不同长度数据序列进行了压缩,给出了实验结果,然后从压缩比、压缩比随字符串长度的变换趋势、算法稳定性和算法复杂性等四个方面对其与其它三种压缩算法lzw 、 lz77 、 rle进行了分析与比较。