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小波包是近年来的一个研究热点,在图像处理方面有着广泛的应用.数据压缩是伴随小波分析产生最早的应用领域.指纹自动识别系统因其本身的特殊性对指纹图像压缩提出了特殊的要求.为此,简要的介绍了小波包变换的基本原理,给出了基于小波包变换的指纹图像压缩方法. 相似文献
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剡颜 《电子工业专用设备》2013,42(2)
介绍了自行开发的一种光学系统自动设计软件,突破传统计算方法,在应用高像差理论,多物距自动变焦距设计等方面,提出了复杂的处理思路,达到了比较理想的设计效果.特别是在光学微细加工领域,解决了许多特殊问题.着重介绍软件的鲜明应用优势、计算方法、关键技术难点的处理、程序结构和应用实例. 相似文献
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周静谦 《电视字幕·特技与动画》2000,(7):34-35
本文主要介绍Pzemieze中的Jmage Mask和Gzadient Wipe两个特殊场景切换效果,初学者不太注意,特别是在使用Gzadient Wipe切换时,渐变灰度图是关键,故附实例图说明。 相似文献
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针对工业炉内特殊的燃烧环境,从消除烟气影响切入,建立了红外计算模型,并利用红外热像仪获得运行状况中炉管表面二维温度场及其变化特征,为优化工艺操作提供了科学依据。 相似文献
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人体热像诊断技术研究 总被引:1,自引:0,他引:1
本文介绍了人体体内的某些病症通过体表发射的红外辐射,由红外热像仪的显示器反映出体内细胞组织的温度变化,依据病患细胞细胞组织与其边沿细胞组织的温差数值及体内温度的对称性,能够对症症实行临床诊断,同时文中介绍了人体热像技术用于脉管炎的诊断方法。 相似文献
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讨论了红外热像仪对裂解分馏塔底积焦,醋酸乙醛装置衬里损坏状况,电气设备热故障,裂解炉管热斑的测试方法及其热像特征,介绍了各种设备测试条件下标算发射率的方法,并对测试精度进行了探讨。 相似文献
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Broadband Pulsed Fiber Laser Generation with Topological Insulator: Towards the Mid-Infrared Regime
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Guo-Bao Jiang Li-Li Miao Yu Chen Shun-Bin Lu Shu-Qing Chen Chu-Jun Zhao Han Zhang Shuang-Chun Wen 《电子科技学刊:英文版》2015,13(4):298-304
In recent years, topological insulators have aroused the attention of a great number of scientists due to their unique electronic structures and peculiar physical properties. Triggered by the similar electronic structures as graphene, the broadband nonlinear absorption properties of topological insulators were investigated. Moreover, the mode-locked or Q-switched fiber lasers based on topological insulators were realized for broadband operating wavelength. Here, we present an overview of the preparation, transferring, linear and nonlinear optical properties, and their applications of topological insulators in pulsed fiber lasers. The pulsed fiber lasers towards midinfrared regimes have been proposed. 相似文献
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作为未来新型光电子器件的有源区材料,采用能带工程形成的各种半导体量子点,以其所具有的许多独特光电特性而日益显示出潜在的重要应用。着重评述了量子点激光器、量子点红外光探测器和量子点单光子发射器件在近3至5年内取得的最新进展,并对存在的问题进行了分析和讨论。最后,提出了进一步改善器件性能的几种可能途径。 相似文献
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Blanchet-Sadri F. 《IEEE transactions on information theory / Professional Technical Group on Information Theory》2001,47(5):1745-1757
The concepts of unique decipherability (UD), multiset decipherability (MSD), and set decipherability (SD) of codes were developed to handle some special problems in the transmission of information. In unique decipherability, different sequences of codewords carry different information. In multiset decipherability, the information of interest is the multiset of codewords used in the encoding process so that order in which transmitted words are received is immaterial. In set decipherability, it is the set of codewords that is relevant information so the order and the multiplicity of words are immaterial. Lempel (1986) showed that the UD and MSD properties coincide for two-word codes and conjectured that every three-word MSD code is a UD code. Guzman (1995) showed that the UD, MSD, and SD properties coincide for two-word codes and conjectured that these properties coincide for three-word codes. In this paper, we answer both conjectures positively for all three-word codes {C1, C2, C3} satisfying |C1|=|C2|⩽|C3 |. Our procedures are based on techniques related to dominoes 相似文献
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In this paper, we study the microwave properties of strongly anisotropic materials made of orientated conducting wires. We have developed a broad band method to determine their permeability μ∥ parallel to the direction of the wires. We investigate the magnetic properties of strongly anisotropic composites made of different types of paramagnetic and ferromagnetic wires. A simple model is proposed to account for the skin effect, and agrees with our observations. This leads to a unique broad band method for measuring the permeability of thin conducting wires 相似文献
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压电叠堆谐振特性的理论与实验研究 总被引:10,自引:2,他引:10
从理论上研究了压电叠堆的基本特性和振动规律.并着重研究了压电叠堆的谐振特性测试中的问题.建立了测试系统.对所研制压电叠堆的特性进行了实验研究.通过理论和实验研究,得出一些结论,这些结论揭示了压电叠堆的独特性能.对器件的设计和推广应用都有一定意义. 相似文献