对比度

During the 1960s under Secretary of Defense Robert MacNamara the Total Procurement Package philosophy had been adopted in which an aircraft was committed to production even before the first example had flown and without any competitive flyoff against rival designs.

在六十年代，国防部长罗伯特· MacNamara的任期过程中、采取了哲学性的总采购方案，包括将飞行器划分到生产线，尽管以前第一个生产飞机的示例已经失拜而且与竞争对手没有任何对比度。

After a brief overview of the first chapter, after the nuclear magnetic moment and then introduce the basic dynamics, imaging concept, and then all kinds of reconstruction methods, contrast and noise.

经过第一章简短的概述后，接着介绍核磁矩的基本动力学、成像概念，然后是各种重建方法、对比度和噪声。

We carried out some test and routine observations, and by the data analyses we conclude:1 This system can improve the contrast and spatial resolution of the filtergram and magnetogram obviously;2 The optimization of the algorithm largely improve the temporal resolution, and this makes the routine observation possible.

通过对试观测和常规观测数据的分析，我们发现：1该系统能够大大提高单色像、磁场数据的对比度和空间分辨率；2对相关跟踪算法的优化大大提高了系统的时间分辨率，系统可以投入常规观测使用。

In the candidate face preprocessing sub-system, the algorithm proposed in this paper first filters the candidate face so as to eliminate the noises, and then extends in gray level up to adjust the contrast of image, and finally uses histogram equalization to adjust the mean value and square difference of images, realizing the gray level normalization.

2对于侯选人脸区域图象预处理子系统；首先对侯选人脸区域进行滤波以去除图象噪声，再做灰度拉伸以调节图象的对比度，然后用直方图均衡调节图象的均值和方差，达到灰度归一化的目的。

Because of the distinct difference in the background color, we use a binary algorithm based on gray mean value and a two-step segmentation method to segment the image. In order to reduce the influence of unlinear change on the image, we divide the shooting score into two parts: integral and floating.

针对靶图像背景颜色对比度大的特点，采用一种基于灰度期望值的图像二值化算法，通过逐步分离的方法，将靶环从背景中分割出来；针对影响靶数精度的主要因素，将靶数分解为整数与小数两部分。

Based on the dual-beam interference principle and white light interference feature, this dissertation designs the SWLI surface 3D topography measuring system and analyzes the principle and characters different from that of traditional monochromatic light interference. According to different descriptions of the white light interference feature, the optimal interference point extracting algorithms are classified, analyzed and compared in detail. In the light of the design rule of improving measuring precision and speed simultaneously, two new types of algorithms, named Feature Matching algorithm and Intensity Contrast Moving Window algorithm, are designed to acquire good results according to practical conditions.

基于双光束干涉原理及白光干涉特性，本文设计了扫描白光干涉法表面三维形貌测量系统，分析了该方法区别于传统单色光干涉测量的测量原理及特点，根据对白光干涉特征不同的描述方式对最佳干涉点提取算法进行了分类、分析与比较，并在提高测量精度与测量速度设计原则的指导下，根据测量系统的实际条件设计了两种新的算法：特征匹配法和对比度移窗法，在实际测量中达到了比较好的测量效果。

Simulation results for the images with different structure and contrast show that TTLS method can yield high quality image and its application field is larger than that of Tikhonov regularization method.

对不同结构以及不同对比度图像的数值仿真结果显示，截断完全最小二乘正则化方法，较只考虑数据项存在误差的Tikhonov正则化方法成像质量高，且适用范围广。

This paper is focusing on the setup of non-contact automatic measurement for the end face of fiber connector by applying micrography and image processing technology.

介绍了一个基于显微成像和数字图像处理技术的非接触式光纤连接器端面自动检测系统：待测的光纤连接器固定于显微平台上，CCD接收显微物镜放大的图像并输入计算机中，然后由系统软件自动对图像进行对比度增强，二值化，平滑去噪，图像分割等处理，从而分析计算出纤芯、包层的各项几何参数。

The contrast ratio was larger than 70, rise time reached 587 microsecond and fall time was 486 microsecond.

器件的对比度大于70，上升时间和下降时间分别达到587 μs和486 μs。

By adopting atmospheric condition of the midlatitude summer model in the daytime, no clouds urban aerosols, spring-summer aerosol profiles and background stratospheric profiles extinct model, the typical spectrum characters of target background radiance, contrast and transmittance are computed by the radiative transfer computation software MODTRAN, and then the spectrum characters in the wavelength bands are analyzed.

选择中纬度夏季白天、无云城市气溶胶模式、春夏季气溶胶廓线以及背景平流层廓线和消光的大气条件，利用辐射传输计算软件MODTRAN计算了目标背景亮度、对比度以及透过率的典型光谱特征，并进行光谱特征分析，然后在其他大气模式下对所选波段进行了验证，从而选择出目标探测的最优波段。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐