Fast Source Camera Identification Using Content Adaptive Guided Image Filter

Source camera identification (SCI) is an important topic in image forensics. One of the most effective fingerprints for linking an image to its source camera is the sensor pattern noise, which is estimated as the difference between the content and its denoised version. It is widely believed that the performance of the sensor‐based SCI heavily relies on the denoising filter used. This study proposes a novel sensor‐based SCI method using content adaptive guided image filter (CAGIF). Thanks to the low complexity nature of the CAGIF, the proposed method is much faster than the state‐of‐the‐art methods, which is a big advantage considering the potential real‐time application of SCI. Despite the advantage of speed, experimental results also show that the proposed method can achieve comparable or better performance than the state‐of‐the‐art methods in terms of accuracy.     

基于DS18B20设计的多点测温系统

多点温度测量系统在工程项目中应用越来越广泛.文中介绍了基于DS18B20数字温度传感器设计的10点测温系统、DS18B20的基本特性、系统硬件电路的连接及软件的设计流程.     

从足底压力分布看步法特征的可靠性

利用比利时FootScan压力传感器,对154名年龄在18至55岁之间的健康男性赤足正常行走时的足底压力数据进行提取,以运动生理学、运动生物力学及足迹步法特征理论为基础,用数理统计学方法对足迹压力数据进行了计算分析,对步法特征形成不同时期足与承受客体相互间的作用过程和作用方式进行深入、系统、定量的研究,进而对步法特征的传统理论进行验证,阐明了对步法特征理论中未经过科学验证部分的认识,并对步法特征理论中各类特征的可靠性及特征价值进行了初步的探讨,为今后的足迹步法特征检验鉴定工作和步法特征的发展完善都提供了有力的依据。     

基于单片机的智能巡线机器人的设计与研究

本文介绍了利用红外反射式传感器实现小车自动识别路线的设计与实现。系统控制核心采用AT89C52单片机,利用模糊算法以及PWM控制方式来实现直流电机的驱动。     

Evaluation of photometric stereo and elastomeric sensor imaging for the non-destructive 3D analysis of questioned documents – A pilot study

Photometric Stereo and Elastomeric Sensor Imaging were assessed for measuring the 3-dimensional (3D) morphology of questioned document samples. Photometric stereo is shown to be a powerful non-contact technique for revealing micron level detail of the samples examined. Elastomeric Sensor Imaging is shown to complement photometric stereo by yielding equivalent results. Additionally, this technique allows quantification of the morphological depth information. The techniques were applied to 2 different types of questioned document sample. Firstly, written signatures were examined. Both techniques were able to reveal characteristic features that could be used to infer stroke direction and ink line application sequence. Secondly toner/ink intersections were examined. Both techniques allowed visualisation of 3D features which were used to infer the sequence of application.