“竹帘”背后的中国——1949-1971年《时代》周刊的中国报道评析     

陈勇  王剑 《怀化师专学报》2011,(12):52-54

1949.10.1-1971.4.9《时代》周刊的报道中所呈现的中国,是一个极度负面的＂风雨飘摇的邪恶帝国＂的形象,这一形象与中国的实际情况相距较远,其报道存在比较明显的不准确和片面的成分。导致这一时期《时代》周刊对中国的报道不太客观公正的原因主要有二：一是其持有强烈的＂反共主义＂意识形态;二是其将中国视为严重威胁美国国家利益的敌人。  相似文献   

彩色图像的数字水印系统设计     

石红芹  吕方亮  刘遵雄 《实验室研究与探索》2011,30(5)

针对数字产品的版权保护问题,利用二维离散整数小波变换的快速性,结合人类视觉系统特性,开发了一种基于彩色图像新的、简单的、鲁棒性盲水印嵌入系统.系统可以将水印信息嵌入到不同整数小波分解级数下的彩色载体图像中去,具有嵌入速度快、安全性高的特点.首先将彩色载体图像由RGB彩色空间转换到YUV空间,再对y分量进行多级整数小波分解,然后分别将有意义的二值图像和字符串作为水印嵌入到不同级数小波分解后的低频域(LLn).算法选择了合适的水印嵌入位置,实验结果证明:系统使图像的不可见性好,所嵌入的水印对一般的图像处理攻击,如噪声、滤波、旋转、压缩等有较强的鲁棒性,系统实用性较强.  相似文献   

一种基于Harris角点特征精确匹配的图像拼接方法   总被引：1，自引：0，他引：1  

涂春萍  柴亚辉  李广丽  刘觉夫 《实验室研究与探索》2011,30(10):40-43

提出了一种基于Harris角点特征的精确匹配方法。该方法首先提取参考图像及待拼接图像中各自的Harris角点点集,并计算出这2个点集间每对点的圆形邻域图像的相关系数;再通过提取各个角点邻域的Hu矩特征,获得了该特征下每对点的相似程度。将不同特征下的相似度进行归一化并融合,构造出2个点集间,每对点的相似度表。在此表的基础上,优化匹配结果,使得匹配点对的总体相似程度高,从而得到精确匹配。由于Hu矩特征具有旋转及尺度不变性,因此提取出的角点特征能够较好地抵抗常见的图像变换。最后,实现了一套包括图像预处理、图像对齐与匹配等诸多模块的图像拼接系统。通过实际操作表明,该方法的图像拼接效率较高,有较好的鲁棒性。  相似文献   

Computed tomography using level set method and algebraic reconstruction technique     

薛倩  王化祥 《天津大学学报(英文版)》2011,17(6):418-423

In this paper, a novel reconstruction technique based on level set method and algebraic reconstruction technique is proposed for multiphase flow computed tomography (CT) system. The curvature-driven noise reduction method is inserted into the conventional iteration procedure of algebraic reconstruction technique to improve the image quality and convergence speed with limited projection data. By evolving the image as a set of iso-intensity contours after each updation, the sufficient number of iterations for acceptable results is reduced by 80%-90%, while the image quality is enhanced obviously. Quantitative evaluation of image quality is given by using both relative image error and correlation coefficient. The resultant images can be utilized to detect flow regimes for monitoring industrial multiphase flow. Laboratory results demonstrate the feasibility of the proposed method. Phantoms of four typical flow regimes can be reconstructed from few-view projection data efficiently, and the corresponding image errors and correlation coefficients are acceptable for the cases tested in this paper.  相似文献   

Length-based vehicle classification in multi-lane traffic flow     

于洋  于明  阎刚  翟艳东 《天津大学学报(英文版)》2011,17(5):362-368

For the realtime classification of moving vehicles in the multi-lane traffic video sequences, a length-based method is proposed. To extract the moving regions of interest, the difference image between the updated background and current frame is obtained by using background subtraction, and then an edge-based shadow removal algorithm is implemented. Moreover, a thresholding segmentation method for the region detection of moving vehicle based on location search is developed. At the estimation stage, a registration line is set up in the detection area, then the vehicle length is estimated with the horizontal projection technique as soon as the vehicle leaves the registration line. Lastly, the vehicle is classified according to its length and the classification threshold. The proposed method is different from traditional methods that require complex camera calibrations. It calculates the pixel-based vehicle length by using uncalibrated traffic video sequences at lower computational cost. Furthermore, only one registration line is set up, which has high flexibility. Experimental results of three traffic video sequences show that the classification accuracies for the large and small vehicles are 97.1% and 96.7% respectively, which demonstrates the effectiveness of the proposed method.  相似文献   

基于灰度共生矩阵的烟雾图像纹理分析     

邓兴  李金兰  郁钟铭 《六盘水师范高等专科学校学报》2015,(4)

烟雾的准确检测,对于火灾的实时检测和预警具有重要的作用。为克服火灾燃烧时烟雾在浓度低、离监控地远、同时受风速等因素干扰情况下,提出一种基于灰度共生矩阵的视频烟雾检测方法。该方法首先利用背景差方法提取运动区域,对运动区域进行分块处理以获取局部信息;然后利用灰度共生矩阵提取每块的纹理特征;最后利用这些烟雾纹理特征（能量、熵、相关性）进行训练获取其内在关系,最终实现烟雾图像提取。实验表明灰度共生矩阵纹理特征在颜色相似的动目标干扰下表现出较好的属性特征,相关试验数据和对比结果表明这种纹理特征对于烟雾的检测是有效的。  相似文献   

无线图像传输系统在黄河防汛指挥中的研究与应用     

郑东飞  李祥瑞 《环球赛鸽科技》2015,(6)

针对山东黄河防汛工作整体要求和信息化建设现状,利用无线图像传输加快防汛信息现代化建设,在更广阔的地域范围内提供“最后一公里”宽带连接,结合山东黄河应急平台建设方案要求,其建设将成为黄河防汛应急管理的一项重要基础性工作。全面推进水利信息化和国家防汛抗旱指挥系统工程建设,是水利可持续发展的基础和前提,充分运用现代计算机网络技术、现代通信技术,建立科学的、高效的防汛指挥系统,减轻洪涝灾害损失,确保防洪安全。  相似文献   

Writing and pseudo‐writing from Internet‐based sources: implications for learning and assessment          下载免费PDF全文

Håvard Skaar 《Literacy》2015,49(2):69-76

In recent years, plagiarism has been on the increase across the Western world. This article identifies Internet access as a contributory cause of this trend and addresses the implications of readily available Internet sources for the teaching and assessment of writing in schools. The basis for the article is a previous study showing a wide incidence of plagiarism in the Internet‐based writing of students in three classes at upper secondary school level in Norway. I relate the students' choices to writing as a cognitive process and as a cultural practice. My basic assumption is that the students' writing is work. It is this work we have in mind when we relate writing to learning and when we assess students' skills on the basis of their written texts. Access to the Internet changes the premises for this work because writing can be replaced by ‘pseudo‐writing’. ‘Pseudo‐writing’ is a work reducing writing practice, which neither excludes nor coincides with what we traditionally associate with plagiarism in schools. The main point in this article is that when students have access to the Internet during essay writing, the result is unavoidably a product of both writing and pseudo‐writing. Internet access thus leads to greater uncertainty about the role writing plays in student learning and makes it more difficult to take written assignments into account in assessing students' school results and effort.  相似文献   

先秦文化中“虹”意象的研究     

史俊杰 《柳州师专学报》2015,(3):14-16

人类对自然界中"虹"现象的认识经历了很长时间的发展,虹在不同的时期具有不同的意义,人类的各种神话也与虹有着千丝万缕的联系。先民视野中"彩虹"蕴含着"龙"和"龙的传人"等含义。  相似文献   

论杭州休闲发展与城市国际形象的提升     

刘嘉龙 《黄石理工学院学报(人文社科版)》2015,(3)

通过举办西湖博览会、世界休闲博览会、国际动漫节、休闲发展论坛等展会,杭州夯实了休闲城市品牌基础,实施了休闲城市发展战略,城市的国际形象得到了快速提升。杭州经验的核心是凝聚休闲发展共识,大力发展旅游休闲、文化创意等特色潜力产业,使其文化软实力和城市竞争力不断增强。杭州大力发展“休闲之都”与“会展名城”,主要表现在：依托科技,借助展会,推动文化与经济、文化与科技的融合;坚持文化多样性,搭建国际会议交流平台,促使经济包容性发展;西博会各项活动精彩纷呈,成为杭州休闲城市精神文明建设的重要载体;西博会、休博会、动漫节成为文化交流重要品牌。杭州休闲文化也在全球范围得到认可。  相似文献