一个DSP实时多任务调度内核的实现

本文阐述了一个用于DSP的简洁而实用的实时多任务调度内核的实现方法.DSP由于其架构的特殊性,在任务调度方面与通用微处理器相似却又有所不同.本文所阐述的内核架构是笔者在长期实践中总结出来的一种有效而简洁的架构,代码段少,占用内存量小,且完全由C语言开发,可以很方便的在各种DSP上移植.     

基于MATLAB实时视窗目标的实时仿真系统设计

在控制系统的设计开发中,传统的开发过程已不能满足市场对产品的快速性和多样性要求,该文提供了一种实现控制系统快速原型开发和实时仿真的新方法。其基本思路是将实时仿真的方法应用于控制系统的开发过程,使控制系统设计、实现、测试和生产准备过程同时进行,以实现产品的快速原型开发。该文中详细介绍了基于MATLAB实时视窗目标的实时仿真系统的构建,并且进一步深入分析了该系统的体系结构和实时机制,最终结合实例给出了相应的实时仿真的开发流程和控制方式。     

Real-time hand posture recognition using range data

A hand posture recognition system using 3D data is described. The system relies on a novel 3D sensor that generates a dense range image of the scene. The main advantage of the proposed system, compared to other gesture recognition techniques, is the capability for robust unconstrained recognition of complex hand postures such as those encountered in sign language alphabets. This is achieved by explicitly utilizing 3D hand geometry. Moreover, the proposed approach does not rely on color information, and guarantees robust segmentation of the hand under varying illumination conditions, and scene content. Several novel 3D image analysis algorithms are presented, covering the complete processing chain: 3D image acquisition, arm segmentation, hand–forearm segmentation, hand pose estimation, 3D feature extraction, and gesture classification. The proposed system is extensively evaluated.     

基于DSP的夜间图像实时增强系统

为了实现夜间图像的实时增强,本文设计了基于DSP的夜间图像实时增强系统,然后对Ardely提出的DADPEQU夜间图像增强方法进行了改进,提出了基于有效黑暗连通集的增强算法,取得了较为满意的增强效果.在设计的实时图像增强系统上对夜间视频图像实时增强进行了尝试,结果表明,本文的方法既能取得较好的增强效果,又能满足实时的处理要求.     

基于定点DSP的MP3实时解码器的设计与实现

FD216是智原科技公司出品的一款结构与ADI公司的ADSP-2181相类似且指令集相兼容的高性价比16位定点DSP芯片。利用智原科技公司提供的开发工具包,可以方便地将C算法移植到FD216中。详细介绍了在FD216评估板上用嵌入式C语言和汇编语言混合编程的方法设计并实现基于定点DSP的MP3实时解码器的整个流程。     

Real-time 3D pointing gesture recognition for mobile robots with cascade HMM and particle filter

In this paper, we present a real-time 3D pointing gesture recognition algorithm for mobile robots, based on a cascade hidden Markov model (HMM) and a particle filter. Among the various human gestures, the pointing gesture is very useful to human-robot interaction (HRI). In fact, it is highly intuitive, does not involve a-priori assumptions, and has no substitute in other modes of interaction. A major issue in pointing gesture recognition is the difficultly of accurate estimation of the pointing direction, caused by the difficulty of hand tracking and the unreliability of the direction estimation.The proposed method involves the use of a stereo camera and 3D particle filters for reliable hand tracking, and a cascade of two HMMs for a robust estimate of the pointing direction. When a subject enters the field of view of the camera, his or her face and two hands are located and tracked using particle filters. The first stage HMM takes the hand position estimate and maps it to a more accurate position by modeling the kinematic characteristics of finger pointing. The resulting 3D coordinates are used as input into the second stage HMM that discriminates pointing gestures from other types. Finally, the pointing direction is estimated for the pointing state.The proposed method can deal with both large and small pointing gestures. The experimental results show gesture recognition and target selection rates of better than 89% and 99% respectively, during human-robot interaction.     

基于DSP的冷连轧实时仿真

针对冷连轧轧制过程这个高度复杂的动态过程,提出了一种新的仿真的方法用来实现实时仿真。它利用数字信号处理器DSP的高速运算速度来实现动态模型的实时计算,通过内存映像网与实物控制器进行数据实时交换,整个过程是实时的。试验表明,该方法能有效地进行复杂冷轧过程的实时仿真,为继续深入这方面研究与应用提供了良好的基础。     

基于TMS320C64xx DSP的实时调度平台

介绍了一种应用在TI TMSB20C64xx系列DSP上的实时调度模块,该模块任务调度机制使用传统的前后台模式。具有运行效率高、占用资源少的特点,很适合作为任务控制不是特别复杂的实时应用软件的底层调度平台。提供了一种使用DSP／BIOS之外的选择。     

实时操作系统μC/OS-Ⅱ在DSP上的移植

本文介绍了将嵌入式操作系统μC/OS-Ⅱ移植到TMS320LF2407A上的方法,并以此为基础实现了基于DSP的嵌入式系统平台.在此开发平台上实现了A/D转换、通信、I/O管理等任务功能.同时着重讨论了在移植过程中遇到的一些细节问题,如堆栈问题、任务切换问题等.     

基于DSP和小波分析技术的实时噪声消除系统

利用TMS320VC5502微处理器和小波分析技术，实现了对强噪声语音信号的分析与去噪处理，在DSP／BIOS控制机制下建立了基于DMA、双缓冲区切换和中断响应机制等技术的音频信号采集与处理的程序框架，并对小波频带阈值去噪、DMA与外没接口配置、DSP内存使用等问题提出了具体的解决方法，为数字信号处理领域相关问题的研究提供了有效例证。     

指势识别的实时指尖提取

指势行为识别作为一种理想的人机交互模式,而指势手指有效分割与指尖提取是关键。采用基于背景差分方法提取前景运动目标并消除背景影响,运用肤色分割方法,提取运动目标脸部、手部区域。在确定指势手与人脸位置关系的基础上,基于指势行为中指尖位于指势手的边沿轮廓,从指势手的外界矩形框与轮廓的交接点中定位指尖点。经实验证明该算法快速有效、提取精度高,且有一定的鲁棒性。     

基于DSP的CAN总线网络与Ethernet数据实时通信实现

针对Ethernet通信响应的不确定性这个缺点,对实现CAN总线网络与Ethernet数据实时通信做了深入的研究,提出了CAN总线网络与Ethernet数据实时通信方案。采用当今最先进的DSP技术,从硬件和软件设计两个方面提出了可行策略,保证网络高速率通信及实时性。     

基于DSP人工混响算法实时处理系统

提出了基于定点DSP的人工混响算法实时处理系统.讨论了DSP芯片TMS320VC5509与音频编解码芯片TLV320A-IC23的硬件接口和软件设计.并在此基础上论述人工混响算法实时播放的设计方法和工作原理,最后提出系统实时性实现的     

飞行实时数据通信的Visual C++实现

介绍了FK－2飞行实时监控系统中地面站与机载设备的通信问题，地面站实时接收并处理数据的方法，以及地面站计算机网络间数据的发送与接收问题，详细阐述了通信中的时隙分配，在VisualC 中线程的使用，以及自定义网络数据格式和深度缓冲法。     

高性能DSP与高速实时信号处理

简要概述了DSP的性能和特点,然后详细介绍了DSP应用软件结构,并对DSP应用的未来趋势——DSP和RTOS的结合进行了初步分析。     

基于DSP的疲劳驾驶实时监测系统研究

较为理想的非接触式检测眼睛疲劳程度的方法是通过摄像技术获取眼部的动态图像,利用累积差分帧和Hough变换等实时图像处理技术来检测、跟踪眼睛,分析眼睛的状态和提取眼睛的特征参数,在一定的时间内连续统计眼睛的闭合时间,计算出PERCLOS值来判断疲劳程度并采取相应的措施。把眼睛检测及跟踪算法移植到专用DSP上,最终开发出疲劳驾驶的嵌入式实时监测系统。实验结果表明,本系统的算法简单、快速、鲁棒性强。     

Validation of a recording system for computer pointing device activity

This study reports on the development of the pointing device activity monitoring software, Mlog, which is used to assess elements of computer use such as pointing device use time. The Mlog monitoring program was written with Virtual C++ and is 1.59 MB in size. It is applicable for computers equipped with computer processing units (CPUs) of 1 GHz or faster, and records pointing device activity at the millisecond level. The accuracy, precision, and reliability of the Mlog monitoring program were tested by comparing Mlog-recorded activity time intervals, for example, the time interval between pressing and releasing the pointing device key, against oscilloscope-recorded pointing device electric signals. For most tested time intervals, the Mlog monitoring program's margin of error for accuracy was within ±0.50%, and it boasted precision error rate of less than 1.00%. Correlation coefficients between the Mlog recordings and the references were all greater than 0.99905, with the highest values observed for dragging actions. For most tested time intervals, the results of the reliability test showed that their intraclass correlation coefficients were higher than 0.95, with few less than 0.90 for those with relatively longer tested time intervals. Linear regression analyses indicated that the pointing device clicking action time intervals recorded by the Mlog monitoring program were very close to the reference values and not affected by CPU speed and memory capacity, computer system loadings of software programs in operation, or types of pointing device key action. In conclusion, the Mlog monitoring program was validated as an accurate tool for monitoring pointing device activity during computer work. Future study is warranted to examine the influences of idle time threshold for electronic activity monitoring, passive computer tasks, and job type on the performance of the program in field studies.

Relevance to industry

The Mlog monitoring program was validated as accurate in measuring pointing device activity during computer work, providing an indirect and supplemental exposure indices for those traditional ergonomic measurements for physical loading assessment.     

基于DSP+FPGA+ASIC的实时红外图像处理系统

设计了一种高性能实时红外图像处理系统。针对红外探测系统,提出了DSP FPGA ASIC的图像处理架构,采用FPGA(EP1S10)实现非均匀性校正等图像预处理,自主研制的ASIC芯片实现图像多级滤波处理,DSP(TMS320C64X)实现红外小目标检测算法,构成处理能力强、接口可靠稳定的图像处理系统。实验测试表明,该实时红外图像处理系统工作稳定、可靠,满足系统性能指标的要求。     

一种基于FPGA和DSP的视频处理系统

该文介绍了一种基于现场可编程门阵列（FPGA）和数字信号处理器（DSP）的实时视频处理系统,此系统以FPGA为数据缓冲和逻辑控制单元,DSP为图像数据处理单元.该文介绍了此视频处理系统的整体结构,详细讨论了从色空间RGB到YCbCr的转换,并给出了转换前后的图像对照.同时也介绍了视频数据流的缓冲处理,以及DSP和FPGA轮流对双口RAM的控制,最后介绍了用DSP实现图像压缩的过程.通过此系统的实现可以看出,使用FPGA实现视频处理系统的控制,可以提高系统的性能,同时使得系统的适应性和灵活性强,设计调试方便.     

视频图像边缘实时检测系统的DSP实现

在研究视频图像实时处理系统的基础上,以TI公司的DSP芯片（TMS320C5000）为硬件开发平台,以Code Composer Studio为软件开发环境,通过硬件设计和软件编程实现视频图像中动态目标的获取、边缘检测;针对传统实现方法的长延时实时处理性差等不足,文章利用CCS对程序中的关键代码进行了优化,并在仿真系统的实验平台上进行了调试;结果证明系统的软件的运行效率得到了提高,达到了实时性的要求;该系统结合了软件算法的灵活性和硬件DSP的高速度,能够对视频图像进行真正意义上的实时处理。