A Survey of Recognizing Action from Single Still Images

人体行为识别是计算机视觉的研究难点与热点,目前大部分研究者主要针对视频中的行为展开研究.然而,人类的视觉往往根据单张图片就可判断图片中发生的行为.基于单张静态图像的人体行为识别,挑战性更大,是近年来人体行为识别研究的一个趋势,更是探索人类视觉奥秘的一个很好切入点.本文对单张静态图像的人体行为识别方法进行梳理,将其分为三类,最后对其未来研究方向进行展望.Human action recognition is a difficult and active research area in computer vision.At present,most of researchers in this field focus on recognizing action from video.However,human can understand human action based on a single picture.Recognize action from single still images has more challenge and is a trend in action recognition in recent years,but also a good entry point to explore the mysteries of human vision.In this paper,we sort out the methods of recognizing action from single still images and classify these methods into three categories.At last,the future research directions are discussed.国家自然科学基金项目(60873179);高等学校博士学科点专项科研基金项目(20090121110032);深圳市科技计划项目-基础研究(JC200903180630A);深圳市科技研发基金项目-深港创新圈计划(ZYB200907110169A);湖南省科技厅科研项目(2010TC2006);教育厅科研项目资助(09A046

壁面催化效应数值研究

高超声速飞行器壁面催化效应会导致激波层中原子在壁面处复合释热,加剧周围气动热环境。针对高超声速流动壁面催化特性,选择不同飞行马赫数及高度条件,采用完全催化和非催化两种条件对球锥模型壁面热流率进行数值模拟计算,研究壁面催化效应对气动热的影响规律。结果表明,固定飞行高度时,壁面催化效应对气动热的影响随马赫数增加而加强,Ma 25条件下驻点处完全催化与非催化热流比值高达1.92。壁面催化效应不仅会影响壁面附近的流场特性及组分分布状态,而且对整个激波层都有一定的影响作用

复现高超声速飞行条件下10°尖锥标模气动力特性试验研究

综述了应用中科院力学所的JF12长试验时间激波风洞中,在复现40km高度,飞行马赫数7的试验条件下,开展的10°尖锥标模天平测力试验研究结果

2018年安溪珠塔内窑调查报告

2018年5月至7月,厦门大学历史系考古专业、福建博物院文物考古研究所及安溪县博物馆等单位联合组成\"安溪古窑址调查队\",对安溪珠塔内窑进行了全面的调查,基本了解珠塔内窑古窑址分布与保存情况,采集了一批明末清初的青花瓷器、白瓷与窑具标本,并发现部分窑炉遗迹,为研究闽南地区青花瓷窑业发展提供了第一手资料

Recognizing Human Actions in Still Images Based on the Improved Random Forest

人体行为识别是计算机视觉的研究难点与热点，在智能视频监控和运动分析等领域有着广泛的应用前景。但目前大部分研究者主要针对视频中的行为展开研究。然而，人类的视觉往往根据单张图像就可判断图像中发生的行为。基于单张静态图像的人体行为识别，挑战性更大，是近年来人体行为识别研究的一个趋势，更是探索人类视觉奥秘的一个很好切入点。因此，开展静态图像人体行为识别具有重要的应用价值和理论意义。 目前静态图像人体行为识别领域还处于起步阶段，对于图像上下文信息对识别精度的影响、不同行为类之间的相似性等问题的研究相对较少。针对这些问题，本文提出基于改进随机森林的静态图像人体行为识别方法。论文的主要工作和创新点如下： ...Human action recognition is a difficult and active research area in computer vision, and has a broad application prospect in the fields of intelligent video surveillance and motion analysis. At present, most of researchers in this field focuses on recognizing action from video. However, human can understand human action based on a single picture. Recognize action from single still images has more ...学位：工程硕士院系专业：信息科学与技术学院_计算机技术学号：3152010115315

Experimental investigation of hypersonic flight-duplicated shock tunnel characteristics

Hypersonic air-breathing propulsion is one of the key techniques for future aviation and the ground aerodynamic testing for full scale test models with sufficient test time at flight conditions is of fundamental importance for verifying hypersonic air-breathing engines. Based on the backward detonation-driven concept, the hypersonic flight-duplicated shock tunnel (or JF-12 shock tunnel) has been successfully constructed and calibrated. This facility is capable of reproducing airflow for Mach numbers ranging from 5 to 9 at an altitude of 25-50 km, with a test duration of more than 100 ms. To quantify the performance of the shock tunnel, experiments were conducted to investigate the aerodynamic characteristics of the test flows and the effects of several critical techniques that play important roles in the operation of the shock tunnel. The stagnation pressure was constant within +/- 5% and the average stagnation pressure varied by less than 0.048%/ms. The variation of the stagnation pressure in repeated experiments is less than 2.0%, indicating the good repeatability of the wind tunnel. The non-uniformity of the Mach number in the core flow field at the nozzle exit was within +/- 2.5%. Additional, a uniform flow field is established upstream of the nozzle exit. The axial gradients of the flow field are small since the Mach number varies less than 1.7%/m. Findings regarding the ignition technology, diaphragm ruptures, detonation driver capacity, incident shock-wave decay, and tunnel operation mode are also presented. The findings of this study are not only helpful for operating the shock tunnel, but can also assist the future development of hypersonic wind tunnels. Graphic abstrac