融合Hu矩与BoF-SURF支持向量机的手势识别

基于尺度不变特征变换的特征包（BoF-SIFT）支持向量机的分类方法具有较好的手势识别效果, 但是计算复杂度高、实时性较差。为此, 提出了融合Hu矩与基于快速鲁棒特征的特征包（BoF-SURF）支持向量机（SVM）的手势识别方法。特征包模型中用快速鲁棒性特征（SURF）算法替换尺度不变特征变换（SIFT）算法提取特征, 提高了实时性, 并引入Hu矩描述手势全局特征, 进一步提高识别率。实验结果表明, 算法无论是实时性还是识别率都要高于BoF-SIFT支持向量机方法。     

湖南电信移动业务发展市场定位探讨

在原主营业务固网经营形势十分不利的情况下,湖南电信公司在重组后成为全业务运营商,迎来历史性的发展机遇。采取何种市场定位扩展湖南电信移动业务运营的良好局面,以期在激烈竞争的移动通信市场求得生存和发展,是湖南电信迫切需要解决的问题。文章在分析湖南省移动通信行业发展现状的基础上,明确了湖南电信在移动通信市场竞争中的优劣势,对湖南电信发展移动业务进行市场细分,提出了明确的市场定位。     

浅析湖南电信渠道建设策略

渠道是产品、服务与客户联系的重要纽带,客户特征和产品属性决定了不同渠道在服务和销售职能上的差异化特性,即一种渠道无法满足所有客户的服务需求,也无法承载所有产品的销售。为进一步提升渠道面向客户的营销效率和服务质量,湖南电信的渠道建设应采取何种发展策略,使之适应全业务运营的需求,已成为一个急需研究和解决的课题。     

以“胡焕庸线”为界的中国东西部净初级生产力变化分析

推动区域均衡协调与可持续发展是我国的重大战略之一,植被净初级生产力（NPP）对生态环境是否可持续发展起着重要作用。以“胡焕庸线”为界把我国分为东、西部,从像元尺度和县级行政单元研究分析我国NPP、人口以及人均NPP时空变化,尤其是东、西部的区域差异。结果表明：我国人口增长较快,从1982年的10.05亿增长到2017年的13.95亿,以“胡焕庸线”为界的西部占比由5.91%增长到6.42%;我国NPP整体呈现增长的趋势,总量由1982年的2.69 Pg C增长到2015年的3.24 Pg C,增长率为16.60 Tg C/a,其中东部增长率12.30 Tg C/a是西部（4.30 Tg C/a）的近3倍;西部人均NPP远大于东部与全国,1982、2000、2010、2017年西部与全国人均NPP持续处于下降的状态,但下降速率略有放缓,东部人均NPP则在2017年首次出现增长。据此可知我国整体生态环境处于恢复的状态,但不同区域之间差异较大,因此在相关政策制定方面应该充分考虑区域差异性,以实现我国生态环境的区域协调发展。     

基于动作轮廓特征的人体动作识别

提出了一种人工挑选关键帧的人体动作识别方法.先从标准视频中提取出能代表姿势的关键动作,然后对待测视频中每一帧图像中人体动作和关键动作比较分类来确定动作时间的相关度和相似度.实验结果表明人工挑选关键帧具有数量少和动作代表性强的特性,基于动作轮廓特征的人体动作识别方法在识别速度上比传统的方法快,识别率也较高.     

A Hu moment invariant as a shape circularity measure

In this paper we propose a new circularity measure which defines the degree to which a shape differs from a perfect circle. The new measure is easy to compute and, being area based, is robust—e.g., with respect to noise or narrow intrusions. Also, it satisfies the following desirable properties:

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it ranges over (0,1] and gives the measured circularity equal to 1 if and only if the measured shape is a circle;

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it is invariant with respect to translations, rotations and scaling.

Compared with the most standard circularity measure, which considers the relation between the shape area and the shape perimeter, the new measure performs better in the case of shapes with boundary defects (which lead to a large increase in perimeter) and in the case of compound shapes. In contrast to the standard circularity measure, the new measure depends on the mutual position of the components inside a compound shape.Also, the new measure performs consistently in the case of shapes with very small (i.e., close to zero) measured circularity. It turns out that such a property enables the new measure to measure the linearity of shapes.In addition, we propose a generalisation of the new measure so that shape circularity can be computed while controlling the impact of the relative position of points inside the shape. An additional advantage of the generalised measure is that it can be used for detecting small irregularities in nearly circular shapes damaged by noise or during an extraction process in a particular image processing task.     

柳叶腊梅中总香豆素的提取工艺研究及纯化

研究畲药柳叶腊梅中总香豆素类化合物的超声辅助提取工艺和液液萃取纯化技术,建立一种简便、快速、廉价、无污染的工艺方法.利用超声的空化作用的液液萃取方法,在单因素实验的基础上,应用正交分析法进行三因素三水平实验研究,最后通过萃取技术得到纯度较高的香豆素类化合物.通过该工艺,利用正交分析的最优条件制备得到提取物中6,7-二甲氧基香豆素(化合物1)和6,7,8-三甲氧基香豆素(化合物2),提取量分别达到0.23 mg/g和0.76mg/g.纯化工艺采用乙醇超声辅助技术和萃取技术,可以快速、方便的提取出目的化合物.该工艺科学合理,适于大规模生产.     

基于Kinect传感器的智能轮椅手势控制系统的设计与实现

利用Kinect深度传感器所获取的图像深度信息实现手部从背景中的分割,并通过在Hu矩基础上加入3个表达式,使不变矩包含更多细节特征,对手势目标进行识别,最后把得到的识别结果转换成控制指令通过Ad-Hoc网络传送给智能轮椅,实现运动控制.实验表明,通过该方法实现的手势识别在图像旋转、缩放、平移的情况下具有不变性,对背景干扰具有较强的鲁棒性.     

瑰丽奇异的唐代女子服饰

唐代是中国封建社会的鼎盛时期,因其政治开明、经济繁荣、文化发达,善于融会学习外来文化,从而形成了雍容大度、璀璨繁荣的服饰文化.其时女子服饰更是瑰丽奇异,襦裙服、女着男装与胡服3种服饰情况充分体现了这一特点.     

Characterisation of zero‐trans margarine fats produced from camellia seed oil,palm stearin and coconut oil using enzymatic interesterification strategy

Zero‐trans interesterified fats were produced from camellia seed oil (CSO), palm stearin (PS) and coconut oil (CO) with three weight ratios (CSO/PS/CO, 50:50:10, 40:60:10 and 30:70:10) using Lipozyme TL IM. Results showed that the interesterified products contained palmitic acid (34.28–42.96%), stearic acid (3.96–4.72%), oleic acid (38.73–47.95%), linoleic acid (5.92–6.36%) and total medium‐chain fatty acids (MCFA)s (∑MCFAs, 5.03–5.50%). Compared with physical blends, triacylglycerols of OOO and PPP were decreased and formed new peaks of equivalent carbon number (ECN) 44 in the interesterified products. The product CPC3′ showed a slip melting point of 36.8 °C and a wide plastic range of solid fat content (SFC) (45.8–0.4%) at 20–40 °C. Also, the major β′ form was determined. These data indicated that the zero‐trans interesterified fats would have a potential functionality for margarine fats. Subsequently, the antioxidative stabilities of interesterified products with the addition of α‐tocopherol (α‐TOH) and ascorbyl palmitate (AP) were investigated. The results indicated that AP had a dose‐dependent effect at concentrations of 100, 200 and 400 ppm.