查询词典 retrieval

Based on rich introduce of image features, similarity matching and indexical technologies, methods of evaluation were investigated and several representative image retrieval systems were introduced. Afterwards, the current difficulty of CBIR, the range and significance of the research were pointed out.

在全面介绍了图像特征，图像匹配相似性技术，特征存储索引方法和检索结果评价方法，以及国际上比较典型基于内容的图像检索系统后，我们指出了目前基于内容的图像检索所面临的研究难点和相关的内容及意义。

At the early 1980s, is an effective mathematic tool to deal with the uncertain or fuzzy knowledge. Rough rule theory has been widely used in information retrieval, digital library, software engineering and knowledge discovery. Its main idea includes acquisition of rough decision rules by reduction of data under the condition of keeping an invariability of classification capacity. And it basically represents a concept by a pair of approximation sets according to the partition on the given data based on the indiscernibility relation. Rough sets theory is well suited to deal with inconsistency of the rough approximations. So it is a new mathematical tool dealing with vagueness and uncertainty, and has found its applications in many areas such as AI, KDD, pattern recognition and classification and fault diagnosis.

主要完成了以下几个方面的工作：(1)对于高速移动机器人车道线跟踪问题中的规则知识获取，首先阐述了模糊逻辑系统的基本特点、工作原理和基本作法，分析了模糊规则知识获取过于依赖专家经验知识、对于每一个细节几乎都需要人工主观经验的参与、难以处理大数据集样本等方面的不足，进而阐述了粗糙集合理论的基本特点、基于粗糙集合理论的规则获取的关键技术和工作原理，为后续章节中经典粗糙集合模型的扩展及粗糙决策规则集的性能分析做好基础；(2)在经典粗糙集理论及其一般扩展的可变精度粗糙集VPRS的基础上，提出了非均匀可变精度粗糙集模型k-VPRS。

A static image retrieval testing system is designed and implemented. It includes following subparts. A hierarchy image content description model is proposed. A multi-feature indexing tree structure using Kohen neural network clustering technique is proposed. A relevance feedback mechanism is also proposed.

3设计并实现了静态图像检索实验原型系统，包括：提出了图像内容的分层描述模型；设计实现了基于自组织神经网络聚类技术的树状多特征索引结构；提出了一种新的相关反馈模型。

A static image retrieval testing system is designed and implemented. Itincludes following subparts. A hierarchy image content description model is proposed. Amulti-feature indexing tree structure using Kohen neural network clustering technique isproposed. A relevance feedback mechanism is also proposed.

3设计并实现了静态图像检索实验原型系统，包括：提出了图像内容的分层描述模型；设计实现了基于自组织神经网络聚类技术的树状多特征索引结构；提出了一种新的相关反馈模型。

In this thesis, an improved method is proposed to overcome the problem that the circular color histogram method does not take the spatial information of colors into account , combines spatial distribution information with image color features. The presented method adopt color space which has the visual uniform , three components carries on no laddered quantification, three components weighting summation composes the row of the circular color histogram construction, and improves retrieval quality, while rotation and translation invariance of color histogram are kept.

针对颜色直方图对图像的空间信息表现不够的问题，本文提出并实现了环形颜色直方图的改进方法，将图像颜色特征和颜色的空间分布信息相结合，采用具有视觉一致性的颜色空间，并把各通道分别进行非等间隔量化，采用各通道向量加权的形式把各通道组合为一个特征向量，提高了检索质量，并保持了原有算法的有效性和旋转不变性。

Intensity correlated imaging,which can realize the lensless Fourier-transform,the diffraction tomography and the two-step phase-retrieval algorithm are combined together to realize intensity correlated three dimensional diffraction tomography by using 650 nm pseudo-thermal light.

利用强度关联成像技术可实现无透镜傅里叶变换的特点，并结合衍射层析技术和二步相位恢复算法，使用波长为650 nm的赝热光实现了强度关联三维衍射层析。

Retrieval of monocyclic aromatic hydrocarbons with differential optical absorption spectroscopy .

利用人工神经网络方法提高差分光学吸收光谱系统测量精度研究。

Based on the simulated multispectral and multiangular satellite measurements, we analyzed the sensitivity of different wavelength and satellite view.angle to the retrieval of the aerosol optical thickness and effective radius.

2利用Mie散射和大气辐射传输模式模拟了一个给定条件下的卫星多视角、多波长的辐射观测，分析了各通道之间可用于气溶胶光学厚度和粒子有效半径反演的敏感性。

However, currently, the retrieval of multiangular remote sensing seldom considers the use of spectral information. We use MSAVI2 as an index to get the a priori knowledge of LAI. As a result, the a priori knowledge is more objective. From the comparison of using or not using this MSAVI predicted a priori knowledge, we found that this approach is effective.

与以往的反演方法相区别，该文利用行播作物二向反射模型，将多角度与多光谱数据结合进行行播作物LAI反演实验，并对反演算法进行了详细的敏感性分析实验，结果表明采用多角度、多光谱遥感数据相结合的方法可以有效反演行播作物的叶面积指数。

In this paper, based on satellite altimeter oceanographical remote sensing and computer technology, several important functions of marine geographical information system are implemented by the acquisition, retrieval, visualization and storing of macroscale sea surface wind data.

本论文基于卫星高度计海洋遥感和计算机技术，通过对大尺度海洋风场数据的获取、处理、可视化、存储等工作，结合地理信息系统和海洋学研究，实践了开发型海洋地理信息系统研发过程中几个重要的具体环节。

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％。