基于小波变换和亮度矩的车牌图像分割算法

车辆牌照图像的分割是车牌识别的前提和基础，针对牌照与车身背景的分割问题，该文提出了基于小波变换和这度矩方法的车辆牌照阈值分割算法，首先，对车牌图像进行小波去噪，然后利用亮度矩对去噪后的车牌图像进行阈值分割，实验结果表明：此方法能够从含有较强噪声的车辆图像中获得车牌图像，且具有相对于图像的平移、尺度变化和旋转的低敏感性。     

高速公路收费系统图像识别技术的研究

本论文主要完成对于车辆牌照的图像识别,车辆牌照的识别是基于图像分割和图像识剐理论,对含有车辆号牌的图像进行分析处理,从而确定牌照在图像中的位置,并进一步提取和识别出文本字符。识别步骤概括为：车牌定位、车牌提取、字符识别。     

车牌自动识别系统中的牌照区域图像分割技术

以车牌自动识别技术中的牌照区域图像分割技术为重点,介绍运用车牌图像进行牌照边缘检测,从而实现图像区域分割,克服整体识别技术中的关键问题的相关内容．     

数字图像处理应用于车辆牌照识别的研究

探讨了将数字图像处理技术应用于机车车辆牌照识别的基本方法.在图像预处理部分,选用灰度差倒数加权平均算法对源图像进行滤波处理;应用分段线性变换算法增强图像对比度.通过边缘检测算法对车辆牌照进行准确地定位及对文字进行分割,完成对车牌上的字符的识别是利用各个字符的图像和字体的特征值,对其中每个字符进行有效、准确的识别.     

基于图像处理技术的车牌识别研究

随着我国公路交通事业的迅速发展,智能交通管理系统已成为了人们关注的焦点问题。车辆牌照识别系统作为智能交通管理系统的一部分,在现实生活中有着广泛的应用。本文对车辆牌照识别系统中的主要部分进行了研究,其中车牌图像预处理部分包括空间平滑滤波、图像锐化等过程;车牌图像定位采用了基于车牌色彩特征的车牌定位法,并使用Radon变换进行车牌图像的矫正;车牌字符分割采用灰度投影和阈值分割的方法;车牌图像识别采用模板匹配的方法。使用MATLAB软件构建识别系统,经过实验测试,该系统实现了对机动车牌照的准确识别。     

一种新的汽车牌照识别的图像增强算法

汽车牌照区域分割是牌照识别的关键步骤，增强图像中的牌照区域，抑制背景区域，可以有效降低牌照区域分割的难度。将图像分解为一组二值图像的组合，然后在二值图像上计算各连通分量及其特征参数，利用牌照区域和背景区域对应的连通分量的特征差别，可以有效抑制背景而保留牌照。处理后的二值图像可重构出牌照区域被增强的图像。还采用等高线标记代替连通分量标记，以减少计算量，使得算法具有实用性。试验表明，这种算法有效地突出了牌照区域而抑制了背景，提高了牌照定位分割的效果，可以很好地用于实际的汽车牌照识别系统中。     

车辆牌照字符识别

介绍了一个牌照字符识别系统的字符串图像提取部分和字符识别部分 .前者采用基于纹理的分割阈值选取方法 ,即先对牌照图像进行纹理分析 ,然后对取得的直方图采用模式识别中的最大最小准则决定分割阈值 ,其效果优于传统的直方图方法 .后者采用多个简单识别器融合方法进行字符识别 .这一方法根据不同类型识别器的特性 ,采用串、并联混合的方案将它们组合在一起 .与单一识别器相比 ,不仅大幅提高了识别率而且缩短了识别耗时 .这一系统对牌照汉字、数字和字母的识别率均大于 96%,总的牌照识别率为 82 %.     

基于小波分解和亮度矩的车牌定位方法

文章提出了一种基于小波分解和亮度矩的复杂背景下,图像中车牌定位和分割的方法。针对小波分解能较好地保留图像中的细节信息,选用小波作为车牌分割工具;为了突出车牌字符与图像中其它信号特征的差异,定义了一个亮度矩函数,用以搜寻牌照的上下、左右边界。仿真结果表明,该方法定位准确率高、速度快。     

基于FPGA的车牌识别算法研究

车牌自动识别系统在实现智能交通系统方面发挥着重要作用,整个系统包括车牌定位、字符分割和字符识别三部分.本设计先确定车牌在获取图像中的具体位置,从而把车辆牌照定位出来,进而对车牌用局部投影的方法进行字符分割,最后采用模板匹配法进行车牌字符的识别.本文提出的方法具有实时采集视频图像,车牌定位准确,分割及识别效率高的优点.     

一种基于灰度差阈值的快速车牌定位方法

智能交通系统（ITS）在现代交通中扮演了越来越重要的角色,车牌识别是智能交通管理中一个重要的环节,车牌识别由预处理、车牌定位、字符分割和字符识别组成,本文从预处理和车牌定位入手,提出了一个运算简单、运行速度快的车牌定位方法。采用图像灰度差阈值生成二值图,利用汽车牌照字符和底色的纹理特征找到车牌位置的新方法。     

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.     

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.     

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.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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.