基于小波变换的合成孔径雷达图像分割研究

图像分割在后续的图像处理中起着至关重要的地位,合成孔径雷达（SAR）的相干斑噪声的存在,降低了图像的质量,传统的方法对不能很好地对图像进行分割。该文结合SAR图像和小波变换的特点,提出了一种新的图像分割方法。首先利用小波变换对图像进行软阈值滤波处理,降低相干斑噪声的影响,然后对重建后的图像进行阈值分割。经试验证明了该方法的有效性。     

基于小波与神经网络的图像分割

图像分割是图像处理的一个经典难题,分割方法也有很多种,但没有一种是万能的方法,都很难在分割效率和分割精度上达到平衡.随着小波分析理论和人工神经丹络在图像处理中的广泛应用,基于小波与人工神经网络相结合的图像分割方法可以更快、更好的分割图像.     

基于小波的数字乳腺图像上肿块的处理

利用对原始乳腺图像进行小波变换后得到的子图来检测肿块,肿块在数字乳腺图像频域上的表现明显异于周围区域,使用适当的小波变换能够把这种特征在变换域中比较直观地显示出来,为了检测出肿块位置,利用Ｂｉｏｒｔｈｏｇｏｎａｌ（ｂｉｏｒＮｒ．Ｎｄ）小波函数族对３９幅原始乳腺图像进行小波变换,分解为包含不同频带的子图,分析子图的结果表明：这种基于小波变换的方法可用于检测数字乳腺图像上的肿块。     

基于多分辨率小波和高斯混合模型的纹理图像分割

提出了一个基于多分辨率小波采样和高斯混合模型的纹理图像分割方法。该方法首先对图像进行必要的预处理,然后对图像进行小波“金字塔”分解。分解后的小波系数和图像共同组成了相应像素的特征向量,然后利用高斯混合模型进行分割。分割的实验结果表明,该算法具有较强的分割能力。     

基于小波变换和形态学的图像分割方法

提出一种基于小波变换的分水岭图像分割方法。首先,源图像进行形态学开闭重建滤波,然后将滤波后的图像进行小波分解,在小波分解顶层的低频概貌图像中用分水岭分割算法将图像分割成若干个小区域,根据一定的区域合并准则进行区域合并,获得初始分割图像,最后将初始分割图像投影到全分辨率图像上,得到最终的分割图像。该方法有效地解决了传统分水岭算法对噪声敏感和过分割问题,并提高了计算速度。     

岩土材料微结构图像预处理方法

为提高岩土材料微结构特征参数提取的准确性和完整性,运用小波变换的多分辨率技术提取并重组了同组图像序列中的清晰部分,进而得到了高清晰度的图像,随后对3种常用的阈值分割方法在岩土材料微结构图像预处理中的适用性进行了对比分析.结果表明:利用小波变换的多分辨率技术重组岩土材料微结构图像,能够有效增大图像信噪比,减小灰度方差,优化微结构数字图像的质量;应用平均灰度法和最大方差自动取阈法处理岩土材料微结构图像,能够有效分割图像并保证特征参数提取的完整性.     

基于curvelet变换的红外图像去噪方法研究

针对传统小波算法所生成的可分离小波只具有有限的方向，不利于图像去噪，本文采用curvelet算法对红外图像进行去噪处理.该方法以小波变换为基础对图像进行分解，在分解所得的一系列小波子带中，以定义的平滑窗函数对曲线边缘进行平滑分割，再对平滑分割处理的每个子块进行Ridgelet变换.最后将小波阈值范围外的系数置零，以curvelet逆变换对原始图像进行重构.红外图像的去噪实验表明，本文算法有效可行，相比传统的小波算法、SVD算法，本算法能获得更高的P_SNR数值，去噪效果更佳.     

基于时间轴小波变换的运动对象分割算法研究

对时间轴一维小波变换的视频运动对象分割算法进行了研究。将视频序列进行时间轴一维小波变换，利用变换后的高频帧信息提取出初步的运动掩模图像；进行数学形态学后处理，以消除各种噪声的影响和对象的不连通性，得到理想的运动掩模图像。实验结果表明该方法分割效果较好，分割出的运动对象可直接应用于基于对象的视频编码，且算法耗时较少。     

基于小波变换的医学影像图像阈值分割实现设计

探讨了基于小波变换算法的数学模型,对医学影像图像的阈值分割进行了实现设计研究,进一步对分割方法的处理结果进行了仿真实验,结果表明利用小波阈值算法对医学影像图像分割效果较好,便于实现.     

基于小波变换的X线图像的处理

在对X线图像的成像机理和图像特点分析的基础上,提出了对骨折X线图像进行基于小波理论的图像处理方法 利用小波变换的多维多分辨分析特性对X线图像进行消噪,将小波包的分解和重构理论与统计差值法相结合对X线图像的细节部分进行增强,用多分辨图像锥和FCM算法来分割图像 该方法确保了骨折智能诊断与治疗系统的精度和准确度.     

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.