基于TMS320C6678的多核程序加载研究与实现

针对多核D SP系统程序加载复杂的问题,基于T MS320C6678对多核程序加载进行了研究与设计。从一级引导程序出发,设计并优化了多核程序内容存储格式。设计了简洁的二级引导程序,以修正一级引导程序只识别主核程序入口地址,而从核入口地址缺失的现象。为了快速生成特定格式的多核程序内容,设计了多个工具用于添加S PI启动参数表、DDR3启动表、从核程序入口地址以及完成程序内容格式的转换。实现了S PI Flash多核程序加载以及基于I2C主模式的Nand Flash多核程序加载。     

局部不变特征点的精度指标

目的 作为计算机视觉的热门研究方向,局部不变特征算法的发展已趋于成熟、稳定,然而目前几乎所有特征点提取算法都没有给出特征点的精度指标.针对这一缺陷,提出一种特征点精度指标-特征点波动区间.方法 性质稳定的点在干扰条件下仍具有较好的精度,即小范围的波动区间,因此,以当前最热门的SIFT(scale-invariant feature transform)特征点为例,在图像加入噪声,发生光照变换,发生模糊变换以及同时进行噪声、光照及模糊处理这四种情况下分别分析同一算法提取的不同特征点的波动情况,进而得到不同特征点的波动区间.结果 实验得到16个稳定检出特征点,其中点2,3,4,11,13这5个点可以在不同干扰条件下的波动范围都较小,而点2则只在模糊条件下波动较小,在其余干扰下波动较大.特征点虽然已经过特征提取,但仍具有不同的波动区间,其优劣也不尽相同.不同的特征点的波动区间并不相同,但仍有一部分特征点在不同干扰条件下均保持较高的提取精度.结论 波动区间能很好地表征每个特征点的提取精度.由于此前只有针对特征点算法的评价指标,而没有针对特征点自身性质的评价方法,因此本文提出的特征点波动区间将为诸如设备标定、视觉测量、精简特征库等相关后续工作打下良好基础.     

Efficient near-duplicate image detection with a local-based binary representation

Efficient near-duplicate image detection is important for several applications that feature extraction and matching need to be taken online. Most image representations targeting at conventional image retrieval problems are either computationally expensive to extract and match, or limited in robustness. Aiming at this problem, in this paper, we propose an effective and efficient local-based representation method to encode an image as a binary vector, which is called Local-based Binary Representation (LBR). Local regions are extracted densely from the image, and each region is converted to a simple and effective feature describing its texture. A statistical histogram can be calculated over all the local features, and then it is encoded to a binary vector as the holistic image representation. The proposed binary representation jointly utilizes the local region texture and global visual distribution of the image, based on which a similarity measure can be applied to detect near-duplicate image effectively. The binary encoding scheme can not only greatly speed up the online computation, but also reduce memory cost in real applications. In experiments the precision and recall, as well as computational time of the proposed method are compared with other state-of-the-art image representations and LBR shows clear advantages on online near-duplicate image detection and video keyframe detection tasks.     

图谱法脑部MRI图像自动分割技术发展及应用

脑部MRI图像自动分割是计算机技术运用于医学上的一个典 型工作,脑部图像分割技术对于人类研究脑部疾病具有重要意义。虽然有一些非常广泛应用 的图像分割方法,如阈值法、区域增长法、聚类法等,但在脑部MRI图像分割中,这些方法 都 没有图谱法具有更为实际的医学研究与临床价值。本文回顾了脑部图像配准、分割的发展历 程,介绍了图谱分割算法的发展及基本原理,以及当前比较前沿的多图谱分割系统的组成和 应用。最后本文对图谱法脑部自动分割在实际临床医学中的应用前景作了总结和展望。     

二维圆环结构中弹性波传播的谱单元分析

为研究弹性波在结构中的波场特征,推导建立一种任意四边形二维谱单元,将其应用于二维圆环结构中的波传播行为模拟.以矩形平板结构中弹性导波传播分析为例,通过与传统有限元分析结果对比,验证所建立谱单元的有效性.有裂纹和无裂纹二维圆环结构谱单元模拟结果表明:弹性波在圆环结构中传播会发生频散;圆环结构表面的裂纹对瑞利波的传播影响最大;根据其反射波包位置可以确定损伤位置.     

An Experimental Study on Three General Interface Layout Designs for Chemical Process Plants

The human‐machine interface design is not a new problem; however, existing knowledge appears to be focused either on interface conceptual design, which determines what information at what time needs to be displayed, or on interface detailed design, which determines the form of display elements. This article presents a study on interface layout design. Three interface layout designs were proposed based on the proximity compatibility priniciple, which were on the same interface conceptual design. In particular, the first interface layout design is with the highest degree of proximity cognition and the second and third with a reduced degree of proximity cognition. They are called sophisticated, semisophisticated, and nonsophisticated interfaces, respectively. An experiment with a simple process plant was conducted to understand user behaviors on the three interfaces. It is noted that in order to provide an unbiased comparative evaluation of these interfaces the same application problem and similar look‐and‐feel forms of interfaces were designed. In the experiment, three general classes of tasks were considered, namely, normal control operation, fault detection (or monitoring), and fault diagnosis. Two categories of measures were used: the performance measure and the subjective measure. The major results obtained from the experiment are 1) the nonsophisticated interface is the best for fault detections in terms of performance measure; besides, this interface has the lowest mental workload for fault detection; 2) the sophisticated interface is the best for normal operation in terms of performance measure; 3) there appears no significant difference for fault diagnosis in terms of performance measures for all these three interfaces; 4) for normal operation and fault diagnosis, the mental workloads for the three interfaces have no significant difference. Overall, the experiment suggests that the nonsophisticated interface be used in practice with additional two reasons: 1) most of time in the chemical process plant today is the fault detection or operation monitoring task, and 2) it is relatively easier for the nonsophisticated interface to adapt to changes in the chemical process plant design, which are common in today's manufacturing environments.     

论包装色彩设计中的多维构架

文章从色彩因子在包装中的运用和色彩的不同属性入手,研究了包装色彩的释义及美学特征。进而从基础属性、支柱属性、以及高级属性等不同维度,阐述包装色彩设计的总体要求。从理论上论证了用多维构架思维进行包装色彩设计的合理性,为包装色彩设计提供了可以借鉴的思路。     

物联网中的信息安全与防范措施

随着信息化社会的不断发展,物联网以其广泛、便捷等特点备受关注。物联网的出现,为互联网的普及提供了一个良好的基础平台。物联网是继计算机、互联网之后又一信息化飞跃,将为信息化生活的加快带来极大的机遇与挑战。并且物联网共享的数据与人们的生活息息相关,这决定了物联网信息的广泛性和敏感性。对物联网中的信息安全和防范措施提出了更高的要求。