查询词典 difference threshold

The application of temporal recursive lowpass filter on the basis of Kalman theory and Ostu (maximal class interval difference) threshold selection, and shadow elimination based on morphology in detection of moving targets was investigated and it was used in actual traffic surveillance video system to realize automatic detection of moving targets.

研究基于Kalman理论的时域递归低通滤波、Ostu阈值选取及形态学阴影消除在运动目标检测中的应用，并将它应用于实际的交通监控视频，实现对运动目标的自动检测。

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。

In practice, two dates of images in Shaoxing area are normalized radiometrically, which selects candidate PIFs objectively with technique including difference threshold, principal component analysis, and regression analysis procedures.

利用绍兴试验区两时相TM影像，通过样本点间差异阈值，主成份分析和回归分析方法控制选取影像对应波段间的PIFs，使得校正样本点的选取具有客观性。

For the evaluation of cathode-ray tubeperceptible color difference threshold characteristics of the visual color matching, the experiment is carried out. By using the compiled color-matching program, the CRT generates color under gray background randomly.

为了对阴极射线管(Cathode ray tube，CRT)显示器颜色恰可辨别的小色差阈值进行评价，在中性灰背景下，用编制的颜色匹配程序，在CRT显示器上随机产生颜色，分别调节程序中R、G、B通道的值，使匹配色与随机色达到视觉上的一致，进行颜色视觉匹配实验，测量CRT显示器上随机色和匹配色的L*a*b*值。

In this paper, Difference threshold method and a combination of joint detection algorithm based on wavelet and the amplitude of the slope is .

本文除研究经典信号处理手段差分阈值法外，还研究了现代信号处理理论与技术基于小波与幅值斜率相结合的联合检测算法。

objective to investigate the difference of motor threshold between the depressed patients and normal volunteers, and analyze the change of cortical excitability in patients.

目的 了解抑郁症患者的运动阈值(motor threshold，mt)与正常人的差异，探讨抑郁症患者的皮层兴奋性变化。

To improve the conventional difference threshold algorithm.

该文对QRS波群的检测算法进行了研究，对传统差分阈值法在R波检测中存在的一些问题加以改进，将正向和倒置R波分开检测，提出了在自适应差分阈值法检测正向R波的基础上，用幅值基线比较法检测倒置R波的检测方法。

In inside and outside pool loss datum,there is notonly the difference threshold,but also the distinctions of internal and externalenvironment lead to the sample heterogeneity,which brings about the measurementdeviation.

在内外部损失样本共享数据库中，不仅存在损失门槛差异，而且存在机构内外部环境等差异而导致的样本异质性，从而导致度量偏差。

Electrocardiogram; QRS complexes ; detection of characteristic parameters ; difference threshold algorithm

心电图； QRS波群；特征参数检测；差分阈值法

Differential threshold: The minimal difference that can be detected between two similar stimuli it called the differential threshold, or the just noticeable difference.

差别感受阈限：刚刚能够察觉的刺激物的最小差别量被称为差别感觉阈限，或最小差别感受阈限。

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性，但我大喊，并在他们的方向扔石头让他们过的线索，远离我，以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。