共查询到20条相似文献,搜索用时 31 毫秒
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边缘识别法在节子整体视频检测中的验证 总被引:1,自引:0,他引:1
通过对原木节子轮廓的数学描述和对节子边缘点的确定,提出一种比较准确的寻找节子边缘点的视频识别验证方法———边缘检验算子法,对节子的形状进行有效的分析和验证。提出了一种有效的节子数学描述和视频处理方法,为节子的视频检测技术提供了新的理论。 相似文献
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基于六点定心理论的原木端面计算机视频定心检测理论应用研究 总被引:5,自引:2,他引:3
在旋切智能上木定心机器人实验台的定心作业过程中 ,定心数据采集主要包括原木四个截面、两种方式的定心处理 ,其中原木两端面的定心数据采集采用计算机视频检测方法。本文依据旋切原木六点定心理论 ,建立了原木端面视频数据采集的数学模型 ,满足了两端面的定心精度要求 ,同时分析了该理论的应用领域 相似文献
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纹理是木材的重要特征,模拟纹理具有极高的工业价值。对视频采集到的板材纹理图像进行灰度化、中值滤波去噪、二值化、腐蚀、膨胀等处理,得到仅包含目标纹理的图像后检测纹理边缘。对板材纹理横断面通过数学描述结果进行模拟,切面通过在图像上选择合适的边缘点进行模拟,以实现板材纹理的模拟再现,并以水曲柳为例分析模拟纹理。 相似文献
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木材无损检测图像处理系统的研究 总被引:10,自引:2,他引:8
本文提出了一种应用X射线无损检测技术检测原木内部缺陷的方法。检测过程中应用计算机数字图像处理技术对原始的X射线图象进行中值滤波、图象锐化、使得处理后的图象更加清晰,图象中的目标易于人眼识别。在中文WINDOWS平台上开发编制软件,界面友好,使用方便,操作简单。实验结果表明这种方法行之有效。 相似文献
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2012年6月至2013年4月,在安西板旱荒漠自然保护区采用红外触发自动相机开展保护区野生动物的监测研究,在20个位点共拍摄到有效照片2517张,获取有效独立照片732张,其中47.4%为兽类,50.8%为鸟类,1.8%为工作人员。应用监测照片共鉴定出物种25种,其中兽类8种,鸟类17种。兽类中拍摄率最高的前3种依次为北山羊、岩羊、中亚兔;鸟类中拍摄率最高的前3种依次为红嘴山鸦、岩鸽、石鸡。分析讨论了红外触发相机在保护区监测应用中的一些常见问题和优缺点。 相似文献
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We report on the design and performance of a system that speeds measurement of radial tree-ring increments on tree stem disks; this method replaces the usual binocular microscope with a video image, and automates the measuring and recording processes. The system was used to measure bole sections cut from stems at various heights to determine volume growth of representative trees in an old-growth ponderosa pine stand. The objective of the measurement system was to speed acquisition of annual growth increments from a large number of disks. A personal computer controls the location of a video camera in a 3-axis positioning system. The operator views the sample on a video monitor and positions the camera over each ring by selecting it with a computer-driven mouse. The computer measures and records the distance that the camera moves between each ring. Task selection is facilitated by menu-driven software that also formats, checks and organizes data files. Measurements have a resolution of 0.026 mm; however, finer resolution could be obtained with a different camera lens. Tests of measurement variability (repeated measurements by individual operators on a single radius) indicated standard errors of 0.006 mm or less for the first measurement sets for four operators. Correlation coefficients among four radii per bole section were as low as 0.66 for a whole tree, suggesting that measurements on single radii may provide poor estimates of radial growth for old trees. This system also offers the potential for automatic ring detection and measurement. 相似文献
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针对森林工程教学内容,教学方法与教学手段存在的问题,通过广泛收集资料,拍摄和录制森林采运工程系列音像片,系统地展现本专业主干学科知识体系和国内外最新研究成果。以期对教学,科研和生产起引导作用,适应面向21世纪专业改革和建设的需要。 相似文献
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在椭圆抛物柱模型中扁方材和板材材积精确解析解推导 总被引:1,自引:0,他引:1
本文以椭圆抛物柱模型计算了毛边板,钝棱板,扁方材等体积的精确解析解。为制材CAD与CAM和下锯图优化提供了精度更高的数学模型。 相似文献
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Repeated examinations in Quercus pubescens, Quercus cerris and Fagus sylvatica during the summer of 1984 and the winter of 1984/85 showed the possibility of improving the diagnosis for the disease known as “forest decline” and of facilitating the detection of damage and the epidemiological surveys for these species, probably for other deciduous broadleaves too. The absence of leaves in the rest period allows better identification of branching damage. These pathological features remain unchanged during the rest period, allowing easier epidemiological surveys and sound comparisons between observations made in the same period in different territories. It also allows accurate photographical records which can be useful for comparison between pictures taken in different years. Summer and winter observations on the studied species were consistent and allowed reciprocal integration, which make it easier to differentiate the three damage classes (slight, medium, severe) which are usually employed in epidemiological surveys of forest decline. 相似文献
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Kostas Kalabokidis Gavriil Xanthopoulos Peter Moore David Caballero George Kallos Juan Llorens Olga Roussou Christos Vasilakos 《European Journal of Forest Research》2012,131(3):597-608
This paper describes the development of a decision support system (DSS) for prevention planning and emergency management of
forest fire events that incorporates weather data management, a geographical data viewer, a priori danger forecasting and
fire propagation modeling, automatic fire detection, and optimal resource dispatching. Collection, input, storage, management,
and analysis of the information rely on advanced and automated methodologies using remote sensing, GPS, digital mapping, and
geographic information systems. The results included short-term dynamic fire danger indices developed for improved and realistic
prevention and pre-suppression planning. An automatic fire detection technology based on infrared video was developed and
successfully tested on site. Several models for understanding fire propagation on forest fires have been proposed for practical
application. Additionally, a DSS was developed with the innovation of covering wildland fire hazard management entirely, providing
a complete coverage of technical and administrative activities that support decision makers in real time. The DSS was tested
for high fire seasons in two different sites in South Europe. 相似文献
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基于嵌入式Linux系统的单个AVI文件视频循环录制的研究 总被引:1,自引:0,他引:1
根据某些特殊作业现场对视频监控的要求,对视频文件循环录制在监控中的重要性进行了分析和讨论.针对当前视频文件循环录制中一般所采用的多文件录制存在的问题,提出了一种在嵌入式Linux系统下采用单个AVI文件进行循环录制的方法.在研究中,重点解决了如何写入帧数据和关闭文件以保证数据完整等问题.实验结果表明,采用单个AVI文件进行视频循环录制方法可行,且能很好地解决采用多个文件时的繁琐和前后文件之间视频信息丢失等问题. 相似文献
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就高职院校高等数学课程教学改革作了一些探讨,针对高职院校的现状,分析了高职学生学习高等数学的心里障碍成因,并提出分层次教学、概念教学以及改变考核方式等途径的解决方法。 相似文献
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提出一种中等强度的MPEG视频加密算法MVEA.MVEA建立在数字多媒体实时动态系统上,独立于任何MPEG视频压缩算法,为实时数字视频提供中等强度、高速度的加密. 相似文献
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航空录像系统及其在森林保健中的应用 总被引:1,自引:1,他引:1
本文介绍了航空录像系统及其在森林保健中的应用情况;探讨了航空录像的技术特点,包括:图像获取系统、导航装备、实验室图像处理系统和其它航空录像系统配套设备和技术;并对发展我国的航空录像技术提出了建议。 相似文献
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刘文金 《中南林业科技大学学报(自然科学版)》2006,26(4):117-120
对中密度纤维板生态循环周期评价进行理论研究.以资源、能源、废弃物、使用过程中挥发物污染等4项内容为参数,探讨了中密度纤维板生态循环周期评价的数学模型.确定了研究过程中采样点选择、数据收集、编目分析、评价模型建立、权重系数确定等具体工作的方法.明确了中密度纤维板生态循环周期评价综合分析的内容和要求. 相似文献