阈值逻辑

It is the first important step in video analysis and will directly affects the effectiveness of indexing Shot boundary detection is one of our major research interests and we will tackle the following existing problems the ambiguity between gradual change and camera motion, the discontinuity during gradual change, false detection caused by illumination variation and flashlight, automatic threshold selection Firstly, we discuss shot boundary detection in non-compressed domain In chapter 2, we compare some of the commonly used detection methods which are based on frame difference and point out that single feature will not generate good results As a conclusion, we use fuzzy logic to combine multiple features Presently, most frame difference based shot boundary detection algorithms rely on threshold and hence the selection of such thresholds will greatly affect the performance of boundary detection We propose a membership function to define frame difference and calculate the membership with self adaptation according to the statistic distribution of frame differences to satisfy different type of video clips Experiments show that the proposed fuzzy shot boundary detection algorithm can be used with different video types and has a high detection precision and recall In chapter 3, we discuss model-based shot boundary detection algorithms regarding chromatic and spatial editing effects such as fade-in, fade-out, dissolve and wipe Various parameters are proposed to better describe the characteristics of each editing type.

镜头边界的检测是把视频自动地分割为一个个镜头，作为基本的索引单元，因此它是视频分析重要的第一步，直接影响到视频检索的成败。镜头边界的检测是本文研究的重点之一。目前镜头边界检测算法主要存在以下问题：渐变与镜头运动难以区别；渐变过程中的不连续与停顿、光照条件的变化及闪光灯等特殊情况会引起误检测；自动选择阈值比较困难等。本文首先针对非压缩域视频进行了镜头边界检测的研究。在第二章中我们采用了比较流行的基于帧间差的方法。在比较各种帧间差计算方法的基础上，指出使用单一的特征难以取得很好的检测效果，提出用模糊逻辑综合使用各种特征。目前大多数基于帧间差的镜头边界检测算法都采用阈值法进行镜头转换的判别。阈值选择的误差对检测性能有较大的影响，本文提出用隶属度函数定义帧间差较大、中等较大和较小等概念，并根据帧间差的统计分布自适应地确定隶属度，以适应不同类型的视频片断。实验结果表明这种基于糊逻辑的镜头边界检测算法可以适应不同的视频，并具有较高的检测精度和检出率。在第三章中采用基于模型的方法进行镜头渐变的检测，研究了淡入／淡出、慢转换和扫换的模型。

The logic function classification with spectral coefficients is discussed and the definition of characteristic threshold logic function is given.

由于阈值逻辑门具有很强的逻辑功能以及其它独特的优点，受到了国内外学术界的重视[1～3]。

Finally, several MTNCs were designed for implementing the XOR operation and Literal, AND, OR operation in ternary logic at switch level. The result of simulation with PSPICE showed that the designed circuits had not only the correct logic function and small propagation delay but also had simple structure. Whats more, when achieving the same logic function, the MTNCs decreased large amount of hardware expense compared with the STN circuits.

对设计出的电路进行PSPICE模拟并测量相关参数，结果表明，该设计方法不但简便、规范，而且设计出的多阈值神经元电路具有速度快，结构简单的优点，并且，在实现相同逻辑功能时，采用多阈值神经元电路相对于单阈值神经元电路，大幅降低了硬件成本。

With utilizing threshold logic, ERTL has very low power dissipation and low gate complexity.

阈值逻辑的应用，使 ERTL 电路的门复杂度大大降低，同时进一步降低了功耗。

ERCCL is also a type of threshold logic.

同时ERCCL是一种阈值逻辑。

In addition, several examples showing the realization of three-variable threshold logic function with three-variable universal-threshold-logic-gates are given.

通用阈值逻辑门是一种通用的阈值逻辑门，可以通过改变它的输入、输出的接法实现所有的给定变量数的阈值逻辑函数。

The detection methodology is based on a robust post-filter and an adaptive threshold logic, which are used to enhance the robustness and sensitivity of the detection system.

该方法是基于观测器产生检测残差，通过鲁棒后置滤波器和自适应阈值逻辑来提高故障检测系统的鲁棒性和敏感性的。

A threshold logic synthesis methodology for ERCCL is also presented.

针对ERCCL提出了一种阈值逻辑综合方法。

Optical logic devices, especially the multiple-valued, threshold and fuzzy logic devices which are more powerful than the binary logic gates, are key elements in the optical computing systems.

光学逻辑元件，特别是在功能上高于二进制布尔逻辑的多值逻辑、阈值逻辑和模糊逻辑元件是光计算系统中不可缺少的关键元件。

A new energy recovery logic style (ERTL: energy recovery threshold logic) based on threshold logic is presented.

2通过把阈值逻辑应用在能量回收电路中，提出了一种新的电路形式－能量回收阈值逻辑电路（ ERTL ： energy recovery threshold logic ）。

Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在，'歼灭战perfuming自己与胡努特，那麼，他来到和SAT 。