Observer determination of the make,model, and year of questioned vehicles

Often, criminal acts involving a vehicle are caught on digital video surveillance systems. While potentially useful for an investigation, the recording conditions are typically less than optimal for the extraction of key information for the identification of the perpetrator, such as a license plate. Providing the make, model and year of a questioned vehicle is a common request for examiners, to narrow the field of potential suspect vehicles. This study seeks to compare the performance of a nonpeer-reviewed make, model, and year determination between two separate groups, specifically, trained forensic image examiners and nontrained individuals. Results show that even with varied image capture conditions and quality, the trained forensic image examiners more correctly and completely identified the test group of questioned vehicles make, model, and year.     

基层派出所视频侦查体系构建实证研究

视频侦查已成为公安机关重要的刑侦基础性工作。目前省、市、县、所四级公安视频侦查体系基本建成,而作为基层一线的“所级”视频侦查体系,实践中没有受到足够的重视。应强化派出所层级的视频侦查体系建设,同时,合理协调全社会视频监控系统建设的系统推进,以提升视频侦查工作实战效能。     

中心城区街面图像实时监控系统建设的思考

中心城区街面图像实时监控系统是城市治安防控体系的一部分,是把握社会治安主动权的重要举措。它的建设要按需设计,充分挖掘各方资源,搞好系统的整体规划,处理好系统建设中的各种关系。     

网络视频监控系统之现状与发展趋势分析

当前，我国既处于发展的重要战略机遇期，又处于社会矛盾凸显期，社会管理中存在着许多问题。为创新社会管理模式，强化社会公共事务的管理，文章阐述了网络视频监控系统在社会治安防控体系中的作用，存在的问题及今后的发展趋势。为进一步深化社会治安防控体系建设，提高社会治安防范管理水平，起到了抛砖引玉的作用。     

关于警务现场照相中影像模糊的成因及对策研讨

影像模糊问题，是警务现场照相工作中需要解决的一个基本的、关键的问题。目前，我国对于影像模糊的后期处理方法，还没有太多的对策，因此，前期影像录入过程中确保避免影像模糊现象的出现，成了警务现场照相工作中亟待解决的重要课题。本文旨在分析径向模糊、抖动模糊形成原因的基础上．讨论了如何有效地避免上述影像模糊的途径与方法，对于影像模糊现象的专项研究具有一定的参考价值。     

Simulation-based reconstruction of traffic incidents from moving vehicle mono-camera

Video recordings from digital cameras implemented in road vehicles present a valuable source of data concerning various dangerous traffic situations, i.e., road accidents or near-miss incidents. This data is readily available and numerous methods for forensic reconstruction of traffic situations from vehicle video were presented in the past. New alternative method for reconstruction of traffic situations from vehicle video is presented in this article. The method is based on the fusion of kinetic vehicle trajectory simulation within 3D laser scanner point cloud, projective geometry, and processing of video footage from moving vehicle camera. The method offers accurate reconstruction of general vehicle motion within relevant time domain whereby in-depth technical information about traffic incident can be quantitatively extracted from video footage. The result is physics-based 3D projection of simulated vehicle motion on the motion of real vehicle recorded by moving monocular camera. The method was validated within performed experimental test runs with respect to vehicle speed, distance travelled, acceleration/deceleration and directional quantities (yaw rate, yaw angle). The method was further applied in the reconstruction of real-world traffic events.     

基于短波紫外光荧光现象快速鉴别静电复印纸的种类

目的 建立无损、快速静电复印纸的鉴别方法.方法 利用文检仪短波紫外光,对30种不同品牌或相同品牌不同批次的静电复印纸测试并比对分析.结果 相同条件下,不同纸张的紫外荧光现象不同,根据纸张在短波紫外光激发下的荧光强弱、荧光纤维条的长短、粗细、弯曲形状和分布稀疏程度等特征,可鉴别不同品牌或相同品牌不同批次的静电复印纸.结论 该方法是一种简单、无损、高效、实用的检验方法.     

Passive forensics in image and video using noise features: A review

Due to present of enormous free image and video editing software on the Internet, tampering of digital images and videos have become very easy. Validating the integrity of images or videos and detecting any attempt of forgery without use of active forensic technique such as Digital Signature or Digital Watermark is a big challenge to researchers. Passive forensic techniques, unlike active techniques, do not need any preembeded information about the image or video. The proposed paper presents a comprehensive review of the recent developments in the field of digital image and video forensic using noise features. The previously existing methods of image and video forensics proved the importance of noises and encourage us for the study and perform extensive research in this field. Moreover, in this paper, forensic task cover mainly source identification and forgery detection in the image and video using noise features. Thus, various source identification and forgery detection methods using noise features are reviewed and compared in this paper for image and video. The overall objective of this paper is to give researchers a broad perspective on various aspects of image and video forensics using noise features. Conclusion part of this paper discusses about the importance of noise features and the challenges encountered by different image and video forensic method using noise features.     

Beyond griefing: Virtual crime

Because there is so much money involved in virtual worlds these days, there has been an increase in criminal activity in these worlds as well. The gaming community calls people who promote conflict “griefers”. Griefers are people who like nothing better than to kill team-mates or obstruct the game’s objectives. Griefers scam, cheat and abuse. Recently, they have begun to set up Ponzi schemes. In games that attempt to encourage complex and enduring interactions among thousands of players, “griefing” has evolved from being an isolated nuisance to a social disease. Much in the same way crime has become the real world’s social disease. Grief is turning into crime.     

公安院校治安类课程与信息技术整合的思考——以上海公安高等专科学校“视频巡逻”课程为例

信息技术与课程整合是指将信息技术有机地与教学结构、课程内容、课程资源以及课程实施等融合为一体,使其成为课程的有机组成部分,成为与课程内容和课程实施高度和谐自然的有机部分。上海公安高等专科学校正是基于以上理念,对治安类课程与信息技术整合进行了为期三年的实践探索,并取得了一定的成效。