基于改进Hough变换的刀具磨损状态监测

针对传统Hough变换的参数空间所需存储量大、运算量大、不利于实现实时监测等缺点,提出了一种基于随机Hough变换的改进Hough变换算法,并将该方法用于工件表面纹理图像的处理,通过对工件表面的二值边缘图像进行改进Hough变换,提取直线段平均长度及直线段与切削速度方向的夹角作为特征参数,实现对刀具磨损状态的判断.算法分析和实验结果表明,该算法所需存储空间少,计算量小;提取的特征参数与刀具磨损状态之间存在密切联系,根据特征参数的变化规律可实现对刀具磨损状态的监测.     

基于Hough变换和数学形态学算子的对不规则直线的提取

提出了一种提取并定位不规则直线的方法.将Hough算法和数学形态学结合在一起,利用Hough算法对直线敏感的优点及数学形态学运算简单准确的特点,避免了Hough算法不能准确定位直线的位置,同时不能判断间断直线和微小弯曲直线的缺点.减少了提取的盲目性和计算的复杂度,加深了对图像的理解.     

基于聚类的建筑物直线特征提取算法

建筑物图像中提取直线是视觉导航、特征识别等很多应用中的关键步骤。针对建筑物图像。提出了一种新的基于聚类的直线提取算法。该算法在Canny边缘的基础上,使用一个聚类算法将边缘分类,减少了因噪声形成的小短线对直线检测的误检或漏检现象;对于每一个分类使用直线识别准则,进一步剔除图像聚类中的伪直线;最后使用改进的Hough变换（standardHoughtransform）将直线提取出来。克服了传统Hough变换执行速度慢的缺陷。实验结果表明,文章提出的算法具有较快的运算速度,较高的直线提取准确性．较低的漏检和误检情况。其性能优于传统的Hough．变换和相位编组法。     

生物芯片微阵列图像倾斜校正算法研究

针对现有生物芯片图像倾斜校正算法校正精度和运算速度的矛盾问题,提出对矩形样点和圆形样点图像分别采用改进的Hough变换和改进的Radon变换方法进行倾斜校正。改进的Hough变换首先对图像进行二值化,并仅统计矩形样点的上下边缘像素的Hough参数和累计值,然后根据所得的Hough参数空间提取占主导的直线组,最终计算出直线组的平均倾斜角度;改进的Radon变换在提取圆形样点边缘后,对边缘图像进行二级Radon变换,从而得到最佳校正角度。实验证明本文的方法能准确、快速地实现芯片图像的倾斜校正,为生物芯片样点识别奠定基础。     

基于局部PCA方向统计分析的Hough直线检测算法

为克服经典Hough变换本身存在的计算时间长、存储空间大的缺点,提出基于局部PCA方向统计分析的Hough直线检测算法.首先在边缘图像范围中选取合适大小的掩膜,通过局部PCA获得支持集内像素点的主元方向;侧重依据所有掩膜内主元方向信息的统计规律来约束Hough变换的极角选择范围,通过缩小参数θ选择范围大大缩短搜索时间.同时,每当一条直线检测完毕,当即把该直线上的点从原图像中除去,一方面可以避免直线间尤其是角度相近的直线问的影响,另外也减少下一轮极角予集范围内搜索的像素点数,提高运算效率.上述过程依此循环,直到检测出所有规定的直线.实验表明,所提出的算法计算精度高,运算时间短,并能提供直线段的完整描述.     

一种多阈值Hough变换车道线检测算法

针对传统Hough变换虚线检测率不足的问题,提出一种多阈值Hough变换车道线检测算法。该算法在对图像进行灰度化处理、逆透视变换、二值化处理的基础上,在预设好的多条直线位置进行突变点检测,并对突变点进行分类、拟合、合并,最后进行Hough变换。3种实际路况的实验表明,该算法能够较准确、稳定地检测出车道线,平均识别率达到9870%,高于传统Hough直线检测算法的平均识别率(86.84%),而且可通过计算车道线线段的长度和点的个数来判断虚线和实线。     

利用空间矩和改进的Hough变换进行亚象素直线特征提取

直线特征是一种重要的图像特征,目前常用的抽取方法是Hough变换,但是它的实时性和准确性较差,因此,文章提出利用空间矩进行亚象素直线特征提取,该方法首先利用空间矩进行亚象素边缘提取,然后利用改进的Hough变换公式进行亚象素直线特征提取。试验表明,该方法具有更好的稳定性和准确性。     

基于Hough变换的表格倾角检测

Hough变换是一种常用的检测直线的算法。在表格识别的预处理阶段,对倾斜的表格进行倾角检测,Hough变换是一种比较好的方法,但Hough变换有运算量大的缺点,本文中根据表格的特点及扫描后表格倾角的范围,首先取表格的一个子区域,在子区域中寻找近铅垂线,对近铅垂线采用二级Hough变换的方法,从而降低了运算量,提高了效率,同时又保证了准确度。     

基于Hough变换的焊接接头自动识别技术研究

以作者所研制的焊接机械手为对象,针对其在焊接大型模具时,焊缝数量多的特点,采用提供信息量大、抗干扰能力强的视觉传感器CCD来获得焊接接头平面位置信息．在对CCD摄取的模架图像进行校正、灰度拉伸、灰度阈值变换后,采用Canny边缘检测算子检测出模架筋板上侧的边缘点,并针对传统的Hough变换方法不能检测出直线端点,容易重复检测直线以及提取直线精度不高的缺点加以改进,采用改进的Hough变换方法提取了筋板边缘线,求取这些边缘线交点即可获得焊接接头平面位置信息．实验结果表明,该方法可以有效解决Hough变换存在的上述问题,并能准确稳定地提取出模架筋板边缘线,达到识别焊接接头平面位置的目的．     

基于自适应阈值区间的动态采样Hough变换直线检测算法

目的为解决Hough直线检测方法计算量大、参数空间中峰值点被次峰值点包围导致漏检或误检、阈值难以设定等问题.方法通过对Hough变换原理以及直线表示的特点进行分析,采用阈值区间表示一条直线,通过三个约束定义了该阈值区间,并根据其中第三条约束识别图像中其他像素点是否在该直线上.对被识别的轮廓线采用邻接关系将像素点聚集为不同类,将其依次存放到数组中,根据数组下标对这些像素点进行动态采样,对采样位置上的m个相邻像素点使用阈值区间进行直线判定与轮廓线上的像素点识别.针对GREC2003标准测试集进行实验验证.结果本算法与已有改进算法、Matlab内置优化Hough变换函数进行对比,实验结果验证了本算法的有效性.结论本算法通过过滤噪声信息,提高了Hough变换直线检测的抗干扰能力,增强了算法的鲁棒性.     

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.