非常态下红外人脸识别的有限元分析

将红外技术与人脸识别技术相结合具有广阔的应用前景,近年来对血流图的红外人脸识别研究越来越多,但它们均假定血流量保持稳定不变。事实上,外部环境温度、喝酒、发烧或运动等因素都会对血流产生影响,进而影响识别性能。为此,本文针对非常态红外人脸识别,尝试开展有限元分析。初步实验证明,该方法能有效提高识别率,对于非常态下的鲁棒生物特征提取有一定的指导意义。     

ATR-FTIR imaging of albumen photographic prints

The preservation of early 20th century, late 19th century albumen prints is of great concern to collection managers and conservators of photographic materials. Attenuated Total Reflection Fourier Transform Infrared (ATR-FTIR) spectroscopic imaging is presented for the first time as analytical methodology for the study of albumen photographs. This paper shows the feasibility of obtaining FTIR images of samples from albumen photographs with a high spatial resolution using a Ge ATR objective coupled with an infrared microscope. The improved spatial resolution compared to FTIR images obtained by the reflection method is due to the high refractive index of the ATR crystal, which gives a high numerical aperture and hence, a higher spatial resolution. The technique reveals detailed information on the organic functional group distribution in the individual layers of embedded cross sections and is used complementary to visual microscopy and scanning electron microscopy/energy dispersed X-ray spectroscopy. The main results of the study are discussed with regard to their historical and artistic significance, and they are compared with data from historical and conservation literature.     

A new method for recording the temporal pattern of stride during treadmill running

The aim of this study was to investigate the reliability of a new infrared light based method (IR₄₀) for recording temporal stride patterns during treadmill running. The IR₄₀ device, emitting a tight web of 40 infrared light beams 10 mm above the treadmill running surface, was compared to a previously validated electro-pneumatic contact shoe (CS) method while nine well-trained athletes ran at 2.8, 3.3, 3.9, 4.4, 5.0, and 5.6 m s⁻¹. Disconnection and reconnection of the IR beams marked the stance phase. The sampling rate was 500 Hz for both methods. The stance phase duration was on average 11.5 (±8.4) ms longer with the IR₄₀ than with the CS depending on earlier touch down (8.3 ± 6.2 ms) and delayed toe off (3.2 ± 5.3 ms) registrations. Significantly different stance phases were recorded between all velocities and for both methods. Thus, despite the fact that the IR₄₀ systematically measured a somewhat longer stance phase duration than CS, the IR₄₀ is nonetheless useful for temporal stride analysis during treadmill running.     

一种新的基于灰度冗余的红外图像均衡技术

针对红外图像的特点,文章提出一种新的基于灰度冗余的红外图像均衡技术.通过设定合适的阈值,将图像灰度直方图中像素分布为零的灰度级进行完全压缩,将小于阈值的灰度级映射到最近的大于阈值的灰度级,然后将有效灰度级做基于幂函数的拉伸变换后进行直方图均衡,最后将均衡后的图像灰度级等间距排列.该算法在压缩灰度冗余的同时进行直方图的无损均衡,保留了图像细节部分,避免了常规直方图均衡所带来的图像细节丢失和灰度断层现象,提高了图像质量.     

可调遥控电源开关的设计与实现

随着社会的发展,电子产品在人们的日常生活中得到越来越广泛的应用,并向以体积小、重量轻、效率高、稳定性强等为优点方向发展。电源技术尤其是数控电源技术是一门实践性很强的工程技术,服务于各行各业。本文介绍可调遥控电源开关的设计,该设计采用红外遥控系统,由红外遥控发射电路发射红外信号,通过红外遥控接收电路接收信号并进行解调,控制电源电路输出所需电压。     

红外光点运动测试系统对射箭技术动作的生物力学研究

借助Qualisys红外光点测试系统对北京射箭队运动员的射箭技术进行生物力学分析,一方面探讨应用这一测试设备对射箭技术进行分析与诊断的可行性与操作方法,另一方面对北京射箭队运动员的射箭技术进行分析与诊断,提出技术改进建议.     

小鼠运动方式--转笼的制作与应用

旨在研制能记录小鼠自主运动的训练装置，以记录小鼠每次主动运动时运动量的大小。方法：用万能角铁建支架，镀锌筛网做跑笼，自行车的前轴用来做转轴，将转笼固定在支架上，共分5层，每层固定4个转笼，每个转笼都安装一个独立的红外线计数器，记录转因数。结果：小鼠在转笼中能自主运动，每小时平均跑7—10m／min；结论：该装置能完整记录小鼠在无外界应激条件作用下自主运动的运动量的大小，可作为研究小鼠自主运动模型的训练装置。     

一种新的红外图像人体检测算法

提出一种新的红外图像人体检测算法并实现。首先采用灰关联分析理论从单幅红外图像中获取边缘轮廓清晰的人体候选区域,然后融合边缘方向梯度直方图特征、区域密度特征及人体形状特征来描述人体候选区域,以提高区域特征的描述准确性,最后使用支持向量机分类器对目标进行分类,在不同的红外图像测试集中进行实验,结果表明,所提出的算法识别效果良好,并具有一定的鲁棒性。     

遥控方便桌的设计

本遥控方便桌属机械电子类,病人不能下床搬桌,通过遥控装置方便灵活移动与升降桌子。该项目已获实用新型专利证书,专利号：ZL201220436108.1。①该桌配备红外线遥控器控制功能,感应器反应快速。病人操作简单,使用方便。②桌面电动升降,安全可靠。根据病人医治、看书和上网所需,手动或自动遥控桌子进退,左右转及桌面升降。③利用单片机根据程序使桌子有自动行进,病人只按遥控器中一个按键,桌子即自动进退转弯和停止。④轻巧牢固,节约空间,方便携带,可叠放。桌子整体重约5kg。