基于DSP 的水下图像传输系统研究

本文研究了基于高性能的DSP 芯片TM S320C549 的水下图像传输系统, 并采用Goertzel 算法进行信源编码 和M FSK 调制方式、运用Turbo 码进行信道的编、解码, 来实现水下视频图像高速数据传输的目的。高等学校骨干教师资助项

Real-time evaluation model for the transmission quality of under water image

基于VQM客观评测模型体系,提出了一种适合水声及无线信道传输的实时图像质量评测模型。模型基于三个分项参数(结构损伤、空域边缘能量增加、空域边缘能量损耗)描述水下图像传输中压缩图像和非压缩图像的典型劣化特征。通过这三个分项参数,可有效地评测水下图像的劣化程度,统计实验表明,本实时评测模型具有较好的评测准确性、单调性和一致性。同时,模型利用了奇异值秩可压缩性,进一步压缩了参考特征的信息量,节约了实时评测所需的信道资源,为实现实时评测的业务评测目标提供了新途径。研究表明,本方法占用的额外信息开销不超过数据信息量的3%,对于水声信道、无线信道等资源受限的实时评测应用具有实用价值。此外,论文设计了基于面积理论的质量网图模型,通过网图的开闭程度,形象直观地反映图像质量的好坏,克服了传统方式在评测结果表达中存在的综合分物理意义不明确等缺陷。本实时评测模型可应用在水下监测、海底勘探等水下图像通信场合,具有较好的应用前景。The paper proposes a real-time image quality evaluation model, which is based on the VQM quality evaluation system.The model is suitable for underwater and wireless applications.The model adopts three parameters, i.e.structure error, energy augment and energy expense, to describe the distortion of the compressed or uncompressed images; and the evaluation model has good evaluation veracity, monotonicity and consistency.The model also takes the advantage of compressing the order of the singular value, which reduces the information of the reference feature, saves the channel resource and provides a new approach to realize real-time evaluation.Research shows that the additional signal cost does not exceed 3% of the total information, so this method is suitable for the applications like underwater acoustic communication or wireless communication with limited channel resource.Besides, the paper also proposes a model that uses triangle image to express the image quality, which overcomes the shortcoming of the confusion in quality score.Experiment shows that the proposed model could be widely used in underwater image communication applications, such as underwater inspection, sea exploration and so on.福建省自然科学基金“青年科技人才创新项目”(2009J05154)资

New Method for Temporal Information Detection of Video Quality Assessment

针对视频质量评测中时域信息的检测方法,本文提出了新的计算方法。该方法根据AnSI T1.801.03-1996和ITu-T rECOMMEndATIOn P.910时域信息(TI)的概念定义和方法推荐,采用先对时域梯度图求直方图,再在所求直方图的基础上进行统计计算的方式,克服了直接进行时域梯度rMS计算带来的乘法运算量与画面像素数成正比从而导致耗时较多的缺陷。实验结果表明,采用本改进方式的乘法运算量仅取决于直方图的灰度级,而与具体像素数无关,在同等条件下的平均计算效率可提高约三倍,且对时域信息的检测效果与推荐方法相仿。该方法实现简单,易于集成,在视频质量评测应用中具有较好的推广价值。Concerning about the Temporal Information(TI) detection for video quality assessment,a new method is proposed based on the definition and algorithm recommended by the ANSI T1.801.03-1996 and ITU-T Recommendation P.910.At first,image of the temporal derivative would be changed into the histogram domain,and then the statistic calculation(RMS and so on) was done for the temporal information.The drawback of the conventional method was overcome whose workload would increase greatly with the increase of the number of the pixel in scene image.Experimental results show that the computation complexity is dependent on the gray level of histogram,but is independent of the number of the pixel by the new method.In the same experiment condition,the computational efficiency is improved three times while the performance is similar to the conventional method.The algorithm is so simple and feasible that it could be used for the application of video quality assessment.福建省自然科学基金青年科技人才创新资助项目(2009J05154

Design and Implementation of USB-TV Stick

对一种基于uSb 2.0的国标dMb-TH数字电视接收棒的系统实现方案进行了研究,采用AdMTV102高频头,凌汛dMb-TH信道解调器,Cy7C68013-uSb 2.0传输控制芯片和基于dIrECTSHOW技术的媒体播放器。介绍了系统各部分相应的软硬件构成以及整个系统的实现过程。经验证,该方案体积小、功耗低、支持热插拔、接收播放效果良好,有很好的市场前景。A design of USB-TV stick of national DMB-TH is researched,using Tuner chip ADMTV102,DMB-TH demodulator chip of Legend Silicon Corporation,USB2.0 transmission and control chip CY7C68013,and player which is based on DirectShow.The processing of hardware and software of the system are introduced.The excellence of the design is small,low power wastage,supporting hot plug,playing easily.The market prospect is favorable.福建省科技计划重点项目资助(2008H0036

Quick estimation of end to end PQoS of image

本文介绍了一种新型的利用图像活动性(IAM)快速估计水下图像端到端体验质量的方法。首先引入结构相似度(SSIM)作为图像感知服务质量(PQo S)参数评价图像质量,将图像初始活动性(IAM)作为区分图像内容的本征参数;随后基于质量向量(QV)的概念,分别分析了非压缩图像的结构相似度,图像初实活动性与无条件丢失概率(SSIM-IAM.-ulp)之间的联合特性,以及压缩图像的结构相似性,压缩率与无条件丢失概率(SSIM-IAM.-ulp)之间的联合特性。最后,在上述联合特性的基础上提出了劣化图像SSIM的预测算法。测试实验证明,该类算法有较高的预测准确率,预测误差最低可达0.8%。This paper introduces a novel method for quick estimating the end to end Perceived Quality of Service( PQo S) of underwater image based on image activity measure( IAM). Structure Similarity( SSIM) is first introduced as the evaluation standard of image PQo S parameter to evaluate the quality of image,while the IAM of original image is utilized as an intrinsic parameter to discriminate the image contents. Then,based on the concept of quality vector( QV),the SSIM-ulp-IAM0 features for non-compressed picture are analyzed,and the SSIM-CR-ulp features for compressed picture are analyzed as well. On this basis,the prediction algorithm based on SSIM for the degraded image is proposed. Test experiment result shows that this kind of prediction algorithm has high accuracy rate,and the lowest prediction error reaches to 0. 8%.国家自然科学基金面上(61571377;61471308)项目资

The Design of Remote Automating Control System of Energy Saving Lamps Life Test

介绍了节能灯寿命实验远程控制系统的构成、性能、特点,分析了系统的软件和硬件的实现方法。The article introducd the composition and characteristics of life-test remote automating control system of an energy saving lamps, and described the implementation of the software and hardware of the system

Software Upgrade of Terrestrial Mobile Digital TV STB Based on DMB-TH

串口软件升级是一种直接升级方式,是较在线升级规模更小且针对性更强的一种升级方式。介绍了地面数字电视机顶盒串口软件升级的实现。首先分析了在DMT-TH地面数字电视发展趋势下,软件升级的必要性,阐述了升级原理;针对无线信道中在线升级稳定性和安全性上的不足,提出了使机顶盒兼具串口升级和在线升级功能;最后,介绍了串口升级的实现方式和升级流程,并分别对服务端和客户端两个部分给予说明。Compared with online upgrade,the serial port software upgrade,one of the direct modes of upgrade,is a smaller-scale and more pertinence mode.This paper introduces the implementation of serial port software upgrade for terrestrial mobile digital TV STB.Firstly,we analyze the necessity of software upgrade in the background of DMB-TH development and expound the upgrading principle.Due to lack of stability and security in wireless channel,we propose that the STB should have both functions of serial port software upgrade and online upgrade.Finally,we present the realization of serial port software upgrade and its upgrading process,and explain the server port and client port respectively.国家自然科学基金项目(60672046

Sofeware and Hardware Design of Connecting-machine Based on HT46R24

随着家校之间联系的要求不断提高,对相关系统的要求越来越多,为了解决上述问题,简单介绍了一种低成本的无线传输系统方案,在选型上以合泰单片机为核心,完成了以单片射频收发器无线模块为主要工作方式的通信硬件设计,就平台的初始化,模块发送,接收给出了设计分析,最后通过实验数据分析,实现的功能满足设计要求,整个系统具有较高的实用性。With the development of communication between schools and families and the increasing demands for the related system,this paper proposes a low-cost solution of radio transmission system.With MCU HT46R24 as the core technology,radio transmission of nRF2401 as the main tool,the hardware design of the communincation system is completed.This paper gives the design analysis on initialization of the platform,the receiving and sending of the module.Experiment indicates that the design could satisfy all the functional requirements and the whole system is of fairly high practical applicability.福建省重点科技计划项目(No2008H0036

OPNET Simulation Method for Underwater Acoustic Networks Based on Chirp Spread Spectrum

针对OPNET软件在水声网络协议仿真中不支持信道结构改变和自定义调制方式的局限,以啁啾扩频的水声网络ALHOA协议仿真为例,提出了一种适合在OPNET上实现更真实水声通信协议仿真的方法。物理层调制方式采用自定义的π/4-DM-DQPSK制式,利用MATLAB将生成的调制曲线导入OPNET中配合OPNET其他管道的配置。在2种具有结构差异的Bellhop信道中验证对ALHOA协议的仿真效果,结果表明信道结构的变化能灵敏地影响ALHOA协议的仿真。此方法对利用OPNET软件灵活开展水声网络协议仿真具有较好的参考价值。Underwater acoustic(UWA) network protocol simulation on OPNET software could not follow the changing of channel structure and did not support custom modulation. In view of the limitations mentioned, a more realistic method of UWA protocol simulation on OPNET was introduced. UWA network ALHOA protocol simulation was token as an example. The physical layer modulation customized was called π/4-DM-DQPSK which was based on Chirp Spread Spectrum. In Matlab, the system would generate a modulation curve which would then be imported into OPNET to adjust the configuration of other pipelines. The simulation results of ALHOA protocol was verified in two Bellhop channels with different structures, which showed changing structure had a sensitive impact on ALHOA protocol. The method introduced has reference value on simulating UWA network protocol flexibly in OPNET.国家自然科学基金项目(61571377;61471308

Coverage Optimization Algorithm of Sensor Nodes Distribution Based on Small Cluster Optimum Feature

无线传感器网络中,为最优化地设置传感器节点,实现最优化的节点信息覆盖,同时减少收敛迭代次数。提出了一种基于小集群最优特征的传感节点优化覆盖算法。通过计算每个个体的适应度,淘汰适应度较低的小集群,复制高适应度的个体,并提出用区域覆盖率这一评价指标体系,使用小集群最优特征适应度函数控制算法流程。根本上减少了收敛次数并提高了计算精度。仿真实验表明对无线传感器网络覆盖进行优化设计仿真迭代次数到183,覆盖收敛,新算法的有效覆盖率为91.2%,结果展示了算法在无线传感器网络中具有较好的时效性和应用性。For the aims of setting the sensor network nodes and realization of the optimum coverage of the nodes information in the wireless sensor networks system, the coverage optimization algorithm of sensor nodes distribution of wireless sensor networks was proposed based on small cluster optimal feature.The fitness of each individual was calculated according to the optimum feature based on the small cluster, the high fitness individuals were duplicated.The computational accuracy and the convergence rate were improved essentially.Simulation result shows that the iterations are 183 and the optimum coverage solution can be reached, and the effective coverage rate can reach 91.2%, the results show the new method has good performance in the sensor network application with real time property