图像处理中改进的Gamma矫正方法     

师一华  杨金锋 《安阳工学院学报》2005,67(6):67-70

在计算机视觉中,光照始终是影响图像质量的重要因素,也是目前尚未有效解决的难题之一.为了有效弱化光照对图像质量的影响,可利用非线性函数叠加的方法构造一个合理的Gamma值变化曲线,使Gamma矫正方法充分适应图像中光照变化的实际情况,能有效防止Gamma矫正可能产生的图像失真.实验证明,此方法在改善图像光照条件,提高图像质量方面具有良好的性能.  相似文献   

Development of students’ text-picture integration and reading competence across grades 5–7 in a three-tier secondary school system: A longitudinal study     

《Contemporary educational psychology》2017

375 students from 24 randomly selected classes of a three-tier secondary school system were tested in a longitudinal study for their text-picture integration and pure reading competence as well as verbal and spatial intelligence at grades 5–7. Data were analyzed according to the integrated model of text and picture comprehension using hierarchical linear modeling techniques. Results indicate that text-picture integration comprises higher spatial cognitive demands than pure reading. School tiers differed in terms of competency levels, but also in terms of growth rates of text-picture integration competence. Differences between lower tiers and higher tiers for text-picture integration competence became smaller from grade to grade, whereas developmental trajectories of reading competence ran parallel to each other. The study reveals that the skills for the conjoint processing of text and pictures develop in a way that might help especially poorer students in lower school tiers to catch up with their mates in higher tiers as compared to the competence of pure reading. Text-picture integration seems to provide gradually better opportunities for less capable learners to compensate for previous lags in their learning.  相似文献   

The significance of materiality in shaping institutional habitus: exploring dynamics preceding school effects     

Pär Isling Poromaa 《British Journal of Sociology of Education》2017,38(3):384-402

This article examines the objective possibilities of Swedish schools to offer an equal and functional pedagogical practice for students’ acquisition of knowledge and skills. The data consist of policy documents, observations, and interviews with students, teachers, and head teachers in three educational settings distinguished by different social demographics. The focus allows for a comparative understanding of how tangible objects generate formations of schools as a relational phenomenon depending on geographic location and social background of students. The article indicates that the impact of materiality lies in its preceding power. It shapes the condition of institutions visualised in architecture, buildings, and the quality of and design of facilities and artefacts. From this material root emanates schools’ values, appeal, social status, and pedagogical organisations – school effects – that empower or weaken the school’s attraction and self-confidence. Different materialities influence each school’s institutional habitus, producing school effects with unequal educational outcomes.  相似文献   

高职生症状自评量表评定结果分析   总被引：5，自引：0，他引：5  

张海涛  苏苓  王宗祥 《漯河职业技术学院学报》2002,1(3):29-32

目的:通过对高职学生心理卫生状况调查,了解高职学生的心理健康状况发展规律。方法:采用症状自评量表(SCL-90),进行比较分析。结果:高职学生各因子分明显高于全国正常成人常模;在总体水平上,高职学生总体的心理健康水平也明显低于全国大学生平均水平;男生的心理健康状况略好于女生;往届生的心理健康水平低于新生的心理健康水平。结论:应加强高职学生心理健康教育工作。  相似文献   

语义图在英语阅读中的运用     

赵苗  郑文兰 《安康学院学报》2006,18(3):115-117

在英语教学中构建语义图,是引导学生深入理解文章的一个有效方法。语义图的各层次分别包括学生对相关主题的联想、篇章的背景知识、文章的重点内容等。因此,可以激励学生在课前主动搜索相关知识、积极加入课堂讨论,并在教师的引导下一步步理解文章内容。除了在阅读方面的作用,语义图也是进行听力、口语、写作等方面训练的有效辅助手段。  相似文献   

现代诗学视野中的刘勰诗体进化论     

王珂 《西北师大学报》2002,39(3):46-51

诗体进化论是刘勰《心雕龙》形式本体论及诗本体论的重要内容。是确立刘勰为体学大师的基础,刘勰的诗体进化论主要由“诗有恒裁”说与“随性适分”说构成,是传统与个人才能对抗与和解的结果。在现代诗学视野中不难发现“诗有恒裁”的合理性和局限性,刘勰的诗体进化观对现代汉诗的体建设也具有积极意义。  相似文献   

不可逆回热斯特林热泵的生态学优化研究     

杨惠山 《泉州师范学院学报》2001,19(6):24-28

应用有限时间热力学理论，探讨热阻及回热损失对一类斯特林热泵的生态学优化性能的影响，所得结论可为斯特林热泵的研制和设计提供新的理论指导。  相似文献   

基于机器视觉的车道标志线检测研究   总被引：10，自引：0，他引：10  

李旭  张为公  卞晓东 《东南大学学报》2004,20(2):176-180

针对车辆辅助驾驶或自主驾驶中的车道保持问题, 研究了基于视觉的车道标志线实时检测方法. 介绍了系统组成、工作原理和车道模型, 并着重讨论了车道图像的检测算法. 其主要思想是在图像上选取几个合适的处理区域, 通过对每个处理区域进行适当的预处理、边缘检测和霍夫变换等过程来提取车道描述特征. 试验结果表明, 该方法具有实时性好、识别可靠性高等特点, 在一定程度上能为后续的辅助驾驶或自主驾驶提供决策依据.  相似文献   

协商民主在中国的适用性条件及其前景   总被引：21，自引：0，他引：21  

王道坤 《华中师范大学学报(人文社会科学版)》2006,45(4):39-45

协商民主是20世纪90年代以来在西方政治学界兴起的一种民主理论,正成为国内学术界开始关注的新领域。该理论强调在多元社会现实的背景下,通过普通的公民参与,就决策立法达成共识。其核心要素是协商与共识。就中国的实践而言,不仅在经济、社会、政治、体制以及文化等方面存在着协商民主的适用性条件,而且还因为中国共产党的权威主导、政府对体制改革的积极倡导、地方民主新形式的示范、解决权力运行问题的需求以及协商民主在实践中具有成本低、风险小的特点等等,相信协商民主在中国有较广阔的发展前景。  相似文献   

Disseminating the right information to the right audience: cultural determinants in the use (and misuse) of rankings   总被引：1，自引：0，他引：1  

Leon Cremonini  Don Westerheijden  Jürgen Enders 《Higher Education》2008,55(3):373-385

Rankings and league tables, or Report Cards (RCs), of Higher Education Institutions have become a global phenomenon. Their purpose, it is claimed, is to help “student-consumers” make informed decisions. Yet the degree to which RCs succeed in helping students in their college choice is disputed. Even though RCs are intended for all, which information is sought and how it is used may differ between potential students hailing from different social, economic and cultural backgrounds. In particular, RCs may neglect certain cultural determinants that influence students’ college choice behaviour. The article reviews the literature on the cultural determinants of college choice and especially the use of RCs in the ambit of cultural determinants. In the United States, possibly because of evident educational gaps between ethnic groups in society, the issue of cultural perceptions in college choice has been addressed, albeit scantly. In Europe, this field of study is virtually non-existent, despite increasing indications that second and third generation immigrants still lag behind in terms of higher education participation and graduation rates.

Jürgen EndersEmail:

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