不变性

Contrary to the traditional idea, they are unified in this thesis in which the problem of scale in vision and the scale-space representation, the essence of the computation of saliency and the method of recognition based on local invariant feature are discussed.

针对在传统机器视觉研究中，尺度、显著性和物体识别多数被分开研究的现状，本文首先分析了三者之间的内在联系和相互关系，得出应该在一个框架中来研究它们的结论；讨论了视觉中的尺度问题和尺度空间表示方法、显著性度量的计算本质以及基于局部不变性特征的识别方法。

A large number of relaxation schemes for feature mapping, claimed to be invariant to transformation, have been reported. However, most of them can deal with transfor-mations involving only rotation and translation, but not scaling. To stay away from the issue of scaling, unrealistic assumptions have to be imposed, such as the conjectures that range data are available so that objects can be rescaled before mapping, and that object shapes are complete so that ratios between object shapes and prototypes can be figured out beforehand. In this paper, we propose a relaxation scheme which is able to be in-variant at a time to rotation, translation, as well as scaling.

截至目前为止已有不少供几何特徵匹配用之松弛法架构被提出来，这些架构虽然宣称可以对空间转移具有不变性，但是实际上，大部分只能处理和旋转及平移有关的转移，对於具有尺度因素的转换泽尽量避免，因此，便有各种不同的假设被加诸於所考虑的问题，例如假设我们已知景深值，因此可以先将物件的尺度正规化后再比对，或者假设物形式晚整的，於是物形和模型间的尺度比率事先可以推知。

The theory of the reaction wheel is introduced at first,then the invariability theory of disturbing compensation and the math description of feed forward control.are recommenoled feed forward control and dead voltage compensation are added in the model of reaction wheel control.

中文摘要：对星载二维转台中反作用轮的控制技术进行了研究。介绍了反作用轮的作用原理，给出了扰动补偿的不变性原理和前馈控制的数学描述。

A currency formula of Laplace space solutions is obtained on the non-dimensional reservoir pressure and the non-dimensional wellborn pressure.

在尺度变换下具有&自相似性&和&标度不变性&，从有限认识无限的特殊规律的科学。

Many differential geometry concepts can beintroduced into the research of structural geology.

古典微分几何研究的是曲线曲面的局部性质和几何不变性，内容十分丰富。

We discuss the reverse mappings of the linear translation of Lipschitz isomorphisms which preserve Γ-null sets, and use them to study the Lipschitz classification of Banch spaces.

运用有界线性算子对Lipschitz映射做线性平移，使其逆映射能够保持Γ-null 集不变性，在Banach空间的Lipschitz分类问题的研究上能得到一个切入点。

As an application, the corresponding results on the exact boundary controllability for n-dimensional quasilinear wave equation with rotation invariance are obtained.

作为一个直接的应用，作者对具有旋转不变性的n(n＞1)维拟线性波动方程建立了相应的局部精确边界能控性。

The relation between reactivities of chars of Heshan coal and their burnouts is studied.

本文更新了煤焦反应性在煤焦燃尽过程中具有不变性的概念，文中首次提出了煤焦瞬态反应性的概念，研究了煤燃烧过程中焦的反应性与燃尽度的关系。

In the area of Biometric recognitions, the fingerprint is so authentic because of its singularity and constancy.

在生物识别的领域中，指纹因为本身的唯一性和不变性而具有相当高的可靠度。

The method first embeds watermark into the geometric invariant Fourier-Mellin domain of an image to weaken the geometric distortion, brought by printing process, of the watermark in presswork, and the image is then used to create presswork via a legal printing process. Secondly, the method rectifies rescanned image from the presswork by using Radon transformation and the embedded watermark in it is detected. Since there is an obvious difference between the destruction degrees of the watermark caused respectively by legal and pirated printing process, we can judge whether a copy of presswork is valid or not just by computing the ratio of the successfully derived watermark and comparing it with a predefined threshold.

该方法先将水印嵌入到具有几何不变性的Fourier-Mellin域中，以削弱正版印刷过程中的几何失真对水印的破坏；再利用Radon变换对由扫描印刷品所获得的图像进行矫正，并从图像中提取嵌入的水印信息；由于正版和盗版印刷过程对水印的破坏程度区别明显，该方法最终通过计算水印提取的正确率来度量这种破坏，并将其与预先制定的阈值进行比较来判定印刷品的正伪。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。