A New Anti‐forensic Scheme—Hiding the Single JPEG Compression Trace for Digital Image

To prevent image forgeries, a number of forensic techniques for digital image have been developed that can detect an image's origin, trace its processing history, and can also locate the position of tampering. Especially, the statistical footprint left by JPEG compression operation can be a valuable source of information for the forensic analyst, and some image forensic algorithm have been raised based on the image statistics in the DCT domain. Recently, it has been shown that footprints can be removed by adding a suitable anti‐forensic dithering signal to the image in the DCT domain, this results in invalid for some image forensic algorithms. In this paper, a novel anti‐forensic algorithm is proposed, which is capable of concealing the quantization artifacts that left in the single JPEG compressed image. In the scheme, a chaos‐based dither is added to an image's DCT coefficients to remove such artifacts. Effectiveness of both the scheme and the loss of image quality are evaluated through the experiments. The simulation results show that the proposed anti‐forensic scheme can verify the reliability of the JPEG forensic tools.     

Color Separation in Forensic Image Processing Using Interactive Differential Evolution

Color separation is an image processing technique that has often been used in forensic applications to differentiate among variant colors and to remove unwanted image interference. This process can reveal important information such as covered text or fingerprints in forensic investigation procedures. However, several limitations prevent users from selecting the appropriate parameters pertaining to the desired and undesired colors. This study proposes the hybridization of an interactive differential evolution (IDE) and a color separation technique that no longer requires users to guess required control parameters. The IDE algorithm optimizes these parameters in an interactive manner by utilizing human visual judgment to uncover desired objects. A comprehensive experimental verification has been conducted on various sample test images, including heavily obscured texts, texts with subtle color variations, and fingerprint smudges. The advantage of IDE is apparent as it effectively optimizes the color separation parameters at a level indiscernible to the naked eyes.     

Identification of Natural Images and Computer‐Generated Graphics Based on Statistical and Textural Features

To discriminate the acquisition pipelines of digital images, a novel scheme for the identification of natural images and computer‐generated graphics is proposed based on statistical and textural features. First, the differences between them are investigated from the view of statistics and texture, and 31 dimensions of feature are acquired for identification. Then, LIBSVM is used for the classification. Finally, the experimental results are presented. The results show that it can achieve an identification accuracy of 97.89% for computer‐generated graphics, and an identification accuracy of 97.75% for natural images. The analyses also demonstrate the proposed method has excellent performance, compared with some existing methods based only on statistical features or other features. The method has a great potential to be implemented for the identification of natural images and computer‐generated graphics.     

论相貌侦查技术员的想象力

相貌侦查是指刑事侦查部门从事模拟画像及颅骨复原等专业技术的人员专门绘制嫌疑人或塑造死者肖像用于通缉疑犯、查找死者身份的专门侦查工作。这种技术员再创造的能力需要侦查人员的丰富想象力。     

中国国民群体意识与中华民族凝聚力关系考察

关于中国国民群体意识是“内聚”还是“内耗”,中华民族凝聚力强还是弱,这是一个学界长期争论的问题。通过群体交互行为的交叉比较分析,可以看出,中国人的群体意识强,中华民族具有很强的凝聚力是一个基本结论,但其作为社会整合的条件是脆弱的,它依靠的是外在的压力和内部绝对权威的刚性统治,只要外在压力一解除,绝对权威一辞世,动乱就有可能到来,权威和动乱构成平衡社会发展的两个砝码。     

足迹信息的计算机管理与查询

目的　根据国内足迹计算机管理系统的现状和需求 ,研制了适合我国刑侦工作特点的足迹管理与查询系统。方法　通过建立鞋厂鞋样、现场足迹和犯罪嫌疑人足迹数据库 ,利用足迹分析与比对软件进行管理和查询。结果　该软件完全能实现足迹管理计算机化 ,降低技术人员的劳动强度 ,提高足迹信息的使用率。结论　该软件使用方便快捷 ,适合推广使用     

论影像技术在现代警务情报中的运用——兼论警务情报影像技术学科建设的必要性

影像技术是指摄影、摄像、电影等技术手段记录对象信息的科技。随着科技的不断发展,影像技术在社会各个领域的应用越来越普及,也使警务情报工作运用影像技术手段进行情报的采集、存储、分析和判研有了可以依赖的技术(物质)基础。在警务情报影像技术中,警务是应用领域,情报是内容,影像是载体和技术手段。当前在警务情报的理论研究和实战应用中,应该使影像技术手段和方式成为重要的组成部分,形成特色的专业理论体系,以期更好地促进公安情报学的发展,更好地培训、指导警务情报实战。     

Multi-resolution image fusion technique and its application to forensic science

Image fusion is a process of combining two or more images into an image. It can extract features from source images, and provide more information than one image can. Multi-resolution analysis plays an important role in image processing, it provides a technique to decompose an image and extract information from coarse to fine scales. In some practical forensic examinations (such as the cartridge image check), we cannot obtain all information from just one image; on the contrary, we need information from images with difference light sources (or light ways). In this paper, we apply an image fusion method based on multi-resolution analysis to forensic science. Synthetic and real images (such as images from closed-up photography and flash photography) are used to show the capability of the multi-resolution image fusion technique.     

论男性叙事中的天使型女性形象

男性作家创作中有两种颇为极端的女性形象:“女巫”与“天使”。围绕男性叙事中的天使型女性形象,从男性审美理想的再现、虚假的女性镜像、规范与压抑三个方面进行分析,可以揭示出男性文学中不自觉的男性立场,继而有利于女性认清自己的生存境遇,同时也有助于男性作家的深刻反思。     

改革开放三十年中国国家形象的变迁

自1978年改革开放至今,中国的国家形象发生了深刻的变化,总体表现为由渐进地融入国际体系发展为承担更多的国际责任,由"和平发展"战略的确立深化为"和谐世界"理念的提出,以传统的发展观演进为全面协调可持续的科学发展现.