基于主线段的签名下划线去除与笔画修复方法

手写签名图像中的下划线影响离线签名鉴伪准确率,为实现签名骨架图像中下划线的去除及笔画修复,提出基于主线段的直线段检测(MLSD)和限距修复(RDR)方法。首先将手写签名骨架化,通过Hough变换初步检测出签名骨架中的线段,然后基于主线段的信息从中检测下划线线段并进行像素标记,去除各下划线像素并在其8邻域内找到笔画起点和终点像素,计算各起点和终点像素距离,最终通过阈值判断进行笔画连接修复。实验结果表明,该方法可以有效检测出签名图像中的下划线,并对去除下划线后的笔画进行准确的修复。

武汉某预应力钢筋混凝土立交主线变宽段荷载试验研究

介绍武汉某预应力钢筋混凝土立主线变宽段静、动荷载试验内容、检测方法,通过预应力钢筋混凝土立交主线变宽段进行试验分析,对桥梁结构的承载能力和工作状况做出综合评价,确保该桥能安全使用。

SEMI ACTIVE VIBRATION CONTROL BASED ON A VIBRATION ABSORBER WITH ADJUSTABLE CLEARANCE

Presented in this paper is a semi active vibration control strategy based on the vibration absorber with adjustable clearance in elastic component. The control law of the clearance for alleviating the vibration of primary system is derived by means of harmonic balancing technique so that the working frequency of the vibration absorber can trace the frequency variation of the harmonic excitation. The efficacy of the strategy is demonstrated by numerical simulations for attenuating the steady state vibration of a SDOF system and a 2 DOF system, which are under the harmonic excitation with slowly varied frequency in a wide range.