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Introduction For at least one decade a need for automaticrestoration of degraded film has been growing.The classical film restoration is based on specialcopying machines to improve the quality of safe-keeping copies.However,such techniques do notpermit the removal of all kinds of degradations be-cause the unit of manipulation is always the physi-cal filmstrip.With the help of digital imagesequence's processing techniques the restorationprocess can be adapted for each frame,each pixeland also f… 相似文献
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Introduction Temporal video segmentation is normally thefirst step towards content-based video retrieval(CBVR). Its goal is to separate video sequence in-to basic units called shots. A shot is a sequence offrames taken by one camera without interruption.Shot changes can be grouped into two classes:abrupt change and gradual change. An abruptchange (also called ‘cut’) is an instantaneouschange from one shot to another. Its changeboundary is between two consecutive frames. Agradual change la… 相似文献
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生石灰作为常用的无机胶结材料,在与水发生熟化反应的过程中会发生剧烈的放热现象,这就为加速乳化沥青的破乳和促进乳化沥青再生混合料中水分的蒸发提供了可能.该文对不同生石灰添加剂量的马歇尔试件进行失水率、标准件养生的15℃劈裂强度和自然养生不同天数的15℃劈裂强度进行了测试,测试结果表明:添加一定剂量的生石灰可以提高乳化沥青再生混合料的强度,缩短强度形成的时间. 相似文献
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水泥含量对乳化沥青冷再生混合料疲劳性能的影响 总被引:1,自引:0,他引:1
疲劳破坏是沥青路面破坏的重要原因之一,对于空隙率较大的乳化沥青冷再生混合料其疲劳性能更为重要.该文采用更接近路面实际受力情况的劈裂试验,对再生混合料的疲劳性能进行研究,分析不同水泥含量再生混合料的疲劳寿命,并且在单对数坐标下对疲劳寿命和应力比进行拟合.得到不同水泥含量再生混合料的疲劳方程,进而对比其疲劳性能的优劣. 相似文献
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ZHOU Lei 《上海交通大学学报(英文版)》2005,10(4):338-343
Intensity flicker is a common form of degradation in archived film. Most algorithms on this distortion are complicated and uncontrolled. This paper presented a discrete mathematical model of flicker, designed a block-based estimation method of the model's parameters according to their features of intensity variation in large area. With this estimation result it constructed a compensation model to repair the current frame. This restoration approach is full automatic and the repair process of current frame does not need the information of frames behind it. The algorithm was realized to establish a simple and adjustable repair system. The experimental results show that the proposed algorithm can remove most intensity flicker and preserve tho wanted effects. 相似文献
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强劲骨架在钢管混凝土劲性骨架拱桥中的应用 总被引:3,自引:0,他引:3
以兰海高速四川昭化嘉陵江大桥、叙古高速磨刀溪大桥、广安官盛渠江大桥为例,介绍了强劲骨架在钢管混凝土劲性骨架拱桥中的应用情况。利用Midas Civil有限元软件,建立了桥梁整体模型和拱圈浇筑施工阶段模型,对拱圈承载能力以及拱圈成拱阶段各构件的受力特性进行了分析。结果表明,强劲骨架提供了20%以上的承载能力,并能极大简化拱圈施工工序。 相似文献