Robot Positioning Based on Multiple Quick Response Code Landmarks

The scheme of robot positioning based on multiple quick response(QR)code landmarks is proposed.Firstly,the pose of the robot relative to the QR code landmarks is obtained by extracting the feature points of the QR code,combined with the visual computing technology.Then,the conversion of the absolute pose of the robot is completed based on the absolute position of the QR code landmark,and thus the real-time position of the robot is obtained.The proposed scheme makes full use of the QR code fault tolerance and multiple QR code landmarks to improve the calculation accuracy.It has good robustness and versatility,and it is easy to implement.It can help the robot to complete the positioning in the actual work,making robot navigation more accurate.

Integrated management system of agro-fishery products based on QR-code

Recently,both the importance and awareness relating to food safety relating to agrochemicals,chemical fertilizers,the pollution of ecosystem and unwholesome foods are growing rapidly.For the same reason,the purchaser's curiosity increases to know about the production process which can be accomplished by production traceability system.The traceability system can store and superintend the specific attribute information about products regarding the productive centre,producer and production finish data.The products undergo various circulation processes and they are being managed by individually constructed traceability system.Thus,it is difficult for the producer and the consumer to guarantee the safety from transpirable issues about the falsification of production traceability because the traceability information can be re-produced by forging through various ways.So in this paper,we proposed a system for integrated management of agro-fishery products based on quick response code(QR-code)for forgery prevention which may help to solve these issues.The proposed system makes QR-code using production information provided by producer.And then it is provided to the distributor and the consumer through integrated service model using the QR-code.Therefore,this system make sure to provide the same production traceability about the products to the distributor and the consumer and always keeps both updated with the same information.

一种基于QR码混沌图像加密算法研究

随着资讯传播互联网化的程度越来越深,线上图像资源的版权保护受到越来越多的重视。该文提出了一种基于QR码(Quick response code)的利用Shearlet变换和线性螺旋变换的混沌图像数字水印算法。首先,对预加密图像资源生成版权QR码。其次,用Arnold变换对QR码进行加扰。最后,用Shearlet变换、线性螺旋变换和离散余弦变换将版权水印信息嵌入图像的中频部分,以嵌入水印。提取则是嵌入过程的逆过程。经试验证明,该文提出的方法不仅具有较好的版权信息隐蔽性,而且还有较强的鲁棒性。嵌入的QR码对一定比例的图像遮挡和噪声具有抗攻击能力。

Simultaneous Localization and Mapping System Based on Labels

In this paper a label-based simultaneous localization and mapping( SLAM) system is proposed to provide localization to indoor autonomous robots. In the system quick response( QR) codes encoded with serial numbers are utilized as labels. These labels are captured by two webcams,then the distances and angles between the labels and webcams are computed. Motion estimated from the two rear wheel encoders is adjusted by observing QR codes. Our system uses the extended Kalman filter( EKF) for the back-end state estimation. The number of deployed labels controls the state estimation dimension. The label-based EKF-SLAM system eliminates complicated processes,such as data association and loop closure detection in traditional feature-based visual SLAM systems. Our experiments include software-simulation and robot-platform test in a real environment. Results demonstrate that the system has the capability of correcting accumulated errors of dead reckoning and therefore has the advantage of superior precision.

可见光到近红外Ⅱ区内宽领域可调发射的芘基共晶

有机材料的可变发光在波导和显示应用方面具有广泛的潜力.然而,基于单一有机分子体系实现从可见光到近红外区域的大范围发光调节仍然是一项挑战.本文介绍了一系列基于芘的同构共晶体,可提供从可见光到近红外Ⅱ区的可调发射.它们的能级是通过引入电荷转移和无氟芳烃-全氟芳烃相互作用而定制的.令人印象深刻的是,这项工作中的有机微晶可以成功地应用于微观层面的多色波导以及宏观层面的二维码显示,为先进的光子学开辟了新的道路.这项工作为获得400至1100 nm的有机晶体提供了一种简单而有效的方法,从而为制造多种光电子学的核心材料提供了可能性.