共查询到20条相似文献,搜索用时 31 毫秒
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图像的特征提取是基于图像的铅笔画绘制的重要基础,本文采用L/L算法实现了参考图像的特征提取。L/L算子是一种非线性算子,它将逻辑运算和线性卷积操作结合起来,通过判断所有的逻辑条件来决定是否做出线性响应,从而能在更好的考虑全局结构关系的基础上,对局部区域上的点作出更合理的判断。该算法实现了自动铅笔画绘制过程中的特征提取,同时也弥补了Canny算法在提取特征的过程中丢失部分主要特征和产生一些伪边缘特征的不足,并通过分析不同的特征结构独立提取出各类特征线,以及对提取过程中的参数调整来控制特征线的分布。 相似文献
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This paper proposes the concept of generalized L systems, GL systems for short, which can describe asynchronized concurrent phenomena. We have proved that the GL systems are proper extensions of the traditional L systems. We have also defined a classification of GL systems and proved a sufficient and necessary condition for the equivalence of two subclasses of GL systems: two GPDOL (a class of deterministic GL systems) systems L[ m1, m2, ??? mj] and L[ n1, n2, ??? nk] are e-quivalent, iff k = j and there exists a common divisor g of all mi and a common divisor h of all nj such that (?) i: mi/g = nj/h. 相似文献
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大概典公司因将“胆机’概念引入电脑多煤体音箱领域而一举成名,从最初的M-10,到之后的M-20、M-30.以及采用前“胆”后“石”设计的2.1多媒体音箱A4.A6,都给我们留下了深刻的印象。据笔者所知,因听过大极典真空管音箱而深中“胆毒”的电脑音频玩家不计其数。怛大极典公司似乎并不满足于此,于2004年年中开始推出LUXOR乐列“石机”多媒体音箱。 相似文献
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Ying Zhang Ai-Guo Wu Guang-Ren Duan 《International Journal of Control, Automation and Systems》2010,8(4):741-747
The L 2–L ∞ filtering problem for continuous-time polytopic uncertain stochastic time-delay systems is investigated. The main purpose is to design a full-order filter guaranteeing a prescribed L 2–L ∞ attenuation level for the filtering error system. A simple alternative proof is given for an enhanced LMI (linear matrix inequality) representation of L 2–L ∞ performance. Based on the criterion which keeps Lyapunov matrices out of the products of system dynamic matrices, a sufficient condition for the existence of a robust estimator is formulated in terms of LMIs. The corresponding filter design is cast into a convex optimization problem. A numerical example is employed to demonstrate the feasibility and advantage of the proposed design. 相似文献
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This paper aims to develop new and fast algorithms for recovering a sparse vector from a small number of measurements, which is a fundamental problem in the field of compressive sensing (CS). Currently, CS favors incoherent systems, in which any two measurements are as little correlated as possible. In reality, however, many problems are coherent, and conventional methods such as \(L_1\) minimization do not work well. Recently, the difference of the \(L_1\) and \(L_2\) norms, denoted as \(L_1\)–\(L_2\), is shown to have superior performance over the classic \(L_1\) method, but it is computationally expensive. We derive an analytical solution for the proximal operator of the \(L_1\)–\(L_2\) metric, and it makes some fast \(L_1\) solvers such as forward–backward splitting (FBS) and alternating direction method of multipliers (ADMM) applicable for \(L_1\)–\(L_2\). We describe in details how to incorporate the proximal operator into FBS and ADMM and show that the resulting algorithms are convergent under mild conditions. Both algorithms are shown to be much more efficient than the original implementation of \(L_1\)–\(L_2\) based on a difference-of-convex approach in the numerical experiments. 相似文献
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SatelliteL10是东芝推向市场的一款中低端笔记本电脑,我们测试的这款采用了IntelPentiumM1.7GHz处理器,配置了256MB内存和60GB硬盘,有些意外的是,该机使用了图形性能一般的Intel855GME芯片组,而并非915GM,因此在图形子系统方面我们没有进行测试。从产品的设计上可以看出,东芝公司对于低端笔记本电脑并没有在工艺水平和功能性方面作出妥协,SatelliteL10采用了银色和黑色搭配的设计,同时具备了商务笔记本稳重以及消费类笔记本时尚的感觉。机身边角处理以及线条设计显示出了不错的做工,各模具之间的缝隙均匀,键盘的按键布局以及手感都… 相似文献
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肖特基 I~2L 利用集成注入逻辑 I~2L 或 MTL 原理,和离子注入方法,在同样密度下能比普通 I~2L 获得更好的性能。肖特基二极管是在多收集极开关晶体管中形成的,它减小了信号摆幅,因此改善了功率延迟效率。极限本征速度同样可有所提高。本文叙述了肖特基 I~2L 的结构和特点并与普通的 I~2L 作了比较。对于设计有用的一个模型进行了讨论,已制成的集成实验结构,可直接提供普通的 I~2L 和肖特基 I~2L 的性能比较。实验结果表明肖特基 I~2L 的功率延迟效率比普通的 I~2L 提高两倍。 相似文献