矩函数用于图象分析研究现状

本文对矩函数用于图象分析的技术现状进行了综合评述与分析,提供丁一个矩函数在图象分析中应用的广泛视角,以期对该技术的进一步深入研究和实际应用提供参考依据。     

电视图像目标实时分割与识别算法

研究一种电视图像目标实时分割和识别算法.在二维图像不变矩和相对矩的基础上,进一步组合优化得出4个不变矩,结合复数矩、圆方差和椭圆方差组成目标特征向量,利用k-近邻法实现目标的识别和分类.图像分割采用改进矩不变阈值分割和基于梯度的自适应阈值分割提取目标.仿真实验表明,提取的目标特征量对于平移、缩放和旋转均能保持较好的不变性.用该分割算法分割的图像边缘清晰,分割时间为8 ms,易于硬件实现.     

ZEPNIKET矩的旋转不变性及对旋转角度的估计

Ｚｅｒｎｉｋｅ矩所用的变换核是一组正交换核，并且矩的模在空间上是旋转不变的，本文指出了Ｚｅｒｎｉｋｅ矩的相位包含了所有有关目标在空间取向的信息，为了提取这一重要信息，提出利用大于给定门限的多个矩的统计估计方法，计算机模拟结果，表明了这种方法有效性。     

应用综合鉴别函数实现畸变不变图像识别

针对传统图像识别方法对目标图像的尺寸、方位敏感问题,采用综合鉴别函数(SDF)实现比例和旋转不变图像识别. 给出了应用综合鉴别函数实现畸变不变图像识别的基本原理,研究了加权系数的计算,提出了用图像序列集{tn(x,y)}合成综合鉴别函数的方法. 通过计算机模拟和光学实验,证明了该方法的可行性.     

二值商标图象检索系统

用七个旋转不变矩来索引图象,构成了商标检索系统,这种系统抗干扰性强,图象检索高效、方便可靠。     

基于累积矩生成函数多元响应降维子空间估计

结合多元响应降维子空间的矩生成函数估计和累积切片思想,提出了累积矩生成函数估计,并对样本估计量作改进.统计模拟结果表明,累积矩生成函数估计优于矩生成函数估计,改进的累积矩生成函数估计最优.     

字符的不变矩计算

引言如果一幅图象的区域被确定后,我们引入一套描绘子来表征一图象的特征,这些描绘子对图象大小的变化、旋转、平移等应是不变的。本文是根据M·K·Hu提出的矩不变理论,计算字符“南”的一组不变矩。它有助于对图象识別的探讨和应用。     

挖掘机器人铲斗不变矩及改进BP网络识别方法

在利用视觉信息跟踪、识别挖掘机器人铲斗目标时,实时采集的铲斗图像存在旋转、平移、缩放等情况.为提高对铲斗目标的识别能力,提出了基于不变矩和神经网络相结合的铲斗目标识别方法.提取铲斗图像对于平移、旋转、缩放具有不变性能的7个不变矩特征向量,归一化后作为改进BP神经网络的训练样本及测试样本.应用训练后的神经网络对铲斗目标进行识别,仿真表明该方法具有较好的识别能力.     

结合学习特征的图像矩视觉伺服方法

针对平面图像特征选择,提出一种结合学习特征的改进图像矩视觉伺服方法,以解决不变图像矩特征存在的交互矩阵奇异问题并获得更优的运动特性.该方法首先基于不变矩特征具有的TRS(2D平移、2D旋转及尺度变化)不变特性,利用非线性支持向量机回归算法,对不变矩特征与摄像机X轴、Y轴转角的关系进行分别学习建模;然后利用两个模型的估计值(即学习特征)作为针对X轴旋转及Y轴旋转运动的图像特征,其交互矩阵具有完全解耦及线性特性,且对于任意平面目标不存在奇异问题;进而结合目标图像重心点坐标和面积的归一化特征及图像方向角特征,实现摄像机在任务空间的平移及旋转六自由度控制;最后通过仿真验证了文中方法的有效性.     

基于RWG基函数和LL基函数的电磁场积分方程矩量法对比

利用基于Rao-Wihon-Glisson(RWG)基函数和双线性（LL）基函数的矩量法求解了任意形状理想导体目标的电磁场积分方程.通过几个计算实例的比较表明,在相同或类似的计算量的情况下,LL基函数比RWG基函数更为完备地描述实际的电流分布,并具有更高的求解精度和更快的收敛特性;同时,仅需作很小的改动,就可以将基于RWG基函数的矩量法程序改写成基于LL基函数的矩量法程序.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.