数码单反相机成像特点及数字图像的后期处理

数码单反相机具有成像色彩饱和度低、焦点不实、反差低三大特点，针对其特点应改变设置，妥善进行图像处理。     

视频监控系统在街面侵财型犯罪防控中的应用评估

从技术层面来看,利用视频监控系统的技术防范模式较传统的人力防范模式具有明显的优势.但从应用现状来看,当前视频监控系统的整体应用效果与其初衷目标尚有差距,投入与产出不相匹配,存在着布建不合理,应用低效能等问题.应在充分认识犯罪规律和监控的区域性功能定位基础上,科学合理地布建视频监控系统,采用多种方法提高对视频监控数据的运用能力,最大限度地发挥该系统在街面侵财型犯罪防控中的效能.     

论MTV的法律属性

MTV是将音乐形式与电视画面形象相结合的一种综合艺术形式。它和电影作品使用相同的摄制方法和程序,使用相同表达方式,作为唱片公司及其旗下的作词者、作曲者、导演、歌手都投入了大量的创作性劳动,因此,MTV应当属于《中华人民共和国著作权法》中规定的"以类似摄制电影的方法创作的作品,"而唱片公司应当具有类似电影作品中制品人的地位,只有这样才能有效行使著作权。     

基于观众接受心理的教育电视画面编辑

随着信息技术和通信技术的飞速发展 ,知识的传播变得前所未有的便捷。教育卫星电视作为远程教育的一种 ,越来越得到普及。因此 ,教育电视节目的制作应以观众接受心理为依据 ,从认知心理学关于注意与记忆规律以及艺术心理学关于知觉组合的原则出发 ,运用教育电视画面的剪辑规则进行编辑     

Juvenile Delinquency in Switzerland Over 50 Years: Assessing Trends beyond Statistics

The general public seems to be convinced that juvenile delinquency has massively increased over the last decades. However, this assumption is much less popular among academics and some media where doubts about the reality of this trend are often expressed. In the present paper, trends are followed using conviction statistics over 50 years, police and victimization data since the 1980s, and self-report data collected since 1992. All sources consistently point to a massive increase of offending among juveniles, particularly for violent offences during the 1990s. Given that trends were similar in most European countries, explanations should be sought at the European rather than the national level. The available evidence points to possible effects of increased opportunities for property offences since 1950, and although causality remains hard to prove, effects of increased exposure to extreme media violence since 1985Swiss conviction statistics are based on registration in the national register of convictions. After 1971, minors were registered only in exceptional cases (Balvig 1988, p. 30)     

Rapid Localization of Bone Fragments on Surfaces using Back‐Projection and Hyperspectral Imaging

Manual localization of bone fragments on the ground or on complex surfaces in relation to accidents or criminal activity may be time‐consuming and challenging. It is here investigated whether combining a near‐infrared hyperspectral camera and chemometric modeling with false color back‐projection can be used for rapid localization of bone fragments. The approach is noninvasive and highlights the spatial distribution of various compounds/properties to facilitate manual inspection of surfaces. Discriminant partial least squares regression is used to classify between bone and nonbone spectra from the hyperspectral camera. A predictive model (>95% prediction ability) is constructed from raw chicken bones mixed with stone, sand, leaves, moss, and wood. The model uses features in the near‐infrared spectrum which may be selective for bones in general and is able to identify a wide variety of bones from different animals and contexts, including aged and weathered bone.     

常用彩色激光打印机打印文件暗记特征的初步研究

目的收集当前我国常用不同品牌和型号的彩色激光打印机打印样本,研究打印文件上暗记特征的提取分析及其变化规律,探讨彩色激光打印文件暗记特征在鉴定实践中的应用及其在打印文件防伪措施中的价值。方法使用显微镜、文检仪及有关图像处理技术分别检验了彩色激光打印机的打印文件样本。结果彩色激光打印机打印文件上会出现暗记特征,且不同品牌的暗记特征出现规律、形态特征和点阵特征不同。结论暗记特征可作为初步鉴别彩色激光打印机品牌型号及打印时间的依据,具有防伪价值,但其在鉴定实践中还存在一定的局限性,有待进一步研究。     

荧光检验法在朱墨时序鉴定中的应用研究

朱墨时序鉴定一直是文书司法鉴定实践中常见的鉴定项目,也是研究的热点和疑难问题.通过实验研究并结合检案实践,较系统地阐述了视频荧光光谱检验法和显微荧光检验法在朱墨时序鉴定的具体应用,探讨了荧光检验的技术要点.研究表明,荧光检验法（特别是显微荧光检验法）具有普通显微检验法的优点,同时对普通显微检验法中难以观察到的印文或文字色料荧光特性及色料的微观分布状态,具有明显的检验效果,是普通显微检验法有效的补充检验手段.     

文检仪在消褪文件检验中的应用

光技术的应用在文件检验中极为广泛,具有方便、快捷、无损等特点。因此,研究利用物理光学仪器—文检仪(VSC)显现消褪变造文件具有重要意义。实验结果表明,文检仪可清晰显现纸张、塑料等载体上经物理或化学方法消褪变造的文件。