基于STM32的全自动菌落计数器光源系统设计

本系统以STM32F103RBT6为主控芯片的电路板为基础,设计了一种自动菌落计数器光源系统。现有的光源光照强度固定且仅有白色光的菌落计数器准确率较低,本设计通过上位机控制上下光源的光照强弱和颜色,以适应机器视觉的特殊光源环境需求,使图像中的菌落信息与培养基信息得到合理分离,大大降低图像处理算法分割、识别的难度,使菌落计数器的准确率和计数速度得到有效提高。     

基于LED技术的油液污染度颗粒检测计数器

油液污染度检测技术应用于具有封闭或半封闭式润滑系统液压设备中液压油、润滑油及合成油的检测,可以检测多种油液的固体颗粒污染程度。当前技术较为领先的污染度检测仪器大多采用遮光原理研制,在光源的选择上主要采用LD激光二极管。提出一种应用LED发光二极管光源的油液污染度在线检测颗粒计数器设计方案,以检测液压油的污染状况,并对LED和LD光源进行比较分析。     

一种单片机控制的变频调速系统设计

采用单片机8031，定时器／计数器8254，HEF4752等器件设计了SPWM变频调速系统，并对系统的工作原理，系统能达到的功能及其设计的方法进行了讨论。     

一种用计数器8253防止程序“跑飞”的方法

介绍了一种采用８２５３计数器实现Ｗａｔｃｈｄｏｇ技术，是微机实时测控系统中预防程序”跑飞“，提高抗干扰能的一种有效方法。     

一种单片机控制的变频调速系统设计

采用单片机8031，定时器／计数器8254，HEF4752等器件设计了SPWM变频调速系统，并对系统的工作原理，系统能达到的功能及其设计的方法进行了讨论。     

基于LPC2214三维数据高速采集系统实现

本文设计实现了牙颌模型三维数据高速采集系统,采用结构光点光源方法实现牙颌模型的三维扫描,重点介绍了扫描控制部分和数据采集部分.本扫描仪控制部分以ARM架构的Philips LPC2214嵌入式微处理器为核心,完成对机械运动控制和数据采集控制.数据采集则用CCD器件作为传感器件,用计数器芯片计数得到空间深度信息.     

高精度透明介质折射率测量系统的设计

以光的电磁理论为依据，设计了集光电为一体的透明介质折射率测量系统。测试以激光为光源，采用双光路法，使得测量结果只与光强的相对变化量有关，并利用常规仪器设备实现了数字化检测显示，消除了传统测试法由于光源不稳定及人为主观读数产生的误差。该系统读数方便、灵敏高，必要时还可以与微机配接，实现系统的实时控制和数据的自动处理，在光学实验、生产研究中极具实用价值。     

PLC在窑头输砖系统中的应用

本文根据生产工艺要求，针对窑头输砖拄制系统的组成原理及可编程控制器Ｉ／Ｏ配置方案，详细论述了系统各种传输运行方式，给出了用户控制程序流程，分析了高速计数器在程序中的应用。     

相对光电编码器的绝对位置计数系统设计

介绍了一种基于MCS－51单片机的位置记录系统，详述了系统组成的各部分如脉冲输入通道、脉冲计数器及其与单片机的接口，数据显示，PC 与单片机的通讯协议等，具有一定的实用价值。     

光纤应变测量系统中CPLD计数器的实现

针对脉冲激光测距中计数量化误差和开关计数器时延不确定影响测时精度的问题，介绍了采用复杂可编程逻辑器件(CPLD)实现特殊高精度计数器的设计过程，并讨论了该设计在基于脉冲激光测距法光纤应变测量系统中的应用。     

The counting pyramid: an adaptive distributed counting scheme

A distributed counter is a concurrent object which provides a fetch-and-increment operation on a shared value. On the basis of a distributed counter, one can implement various fundamental data structures, such as queues or stacks. We present the counting pyramid, an efficient implementation of a distributed counter in a message passing system, which is based on software combining. The counting pyramid adapts gracefully to changing access patterns, guarantees linearizability, and offers more general fetch-and-Φ operations. We analyze the expected performance of the counting pyramid, using queueing theory and simulation. We show that the latency of the counting pyramid is asymptotically optimal.     

A review of ridge counting in dermatoglyphics

This paper reviews the problem of counting ridges in a digitized fingerprint and examines an interactive software system that relieves the tedium of visual inspection and standardizes the counting procedure. The software system includes digitizer, preprocessor and counter subsystems. The preprocessor smoothes and thresholds the image. The counter defines an appropriate window around the line between two user-selected points, eliminates artifacts and counts runs of zero pixels. A preliminary experiment with a counter based on the Hough transform is also briefly discussed.     

Phantom based point by point photon counting and imaging of human skin tissue

Time-correlated single photon counting (TCSPC) is popular in the resolved techniques due to its prominent performance such as ultra-high time resolution and ultra-high sensitivity. This paper presents advance signal processing techniques on the optical TCSPC signals obtained from the series of experiments on fabricated tissue like phantom. A pulsed laser sources at a wavelength of 830 rim transmits the light through the surface of phantom and finally at receiver side, photon counting device generates the histogram of the receiving signal. The noisy data obtained from the photon counter is processed with the splitting based denoising method. The method divide the signal into different subsets based on the transitions. Each subset is then processed individually and final merging of all subsets gives noise free signal. The main objective of this work is to analyze the signal obtained from photon counter in context of skin blood absorption. We had examined the signal obtained by varying the distance between transmitter and receiver to extract the features. Experimental results with our prototype shows more scattering with the increase in the distance at 3dB level and hence less absorption with increase in the distance.     

基于VB的高精度智能化流量计检定系统

介绍了用VB开发高精度流量计检定系统的方法。该系统应用多周期同步测量原理和硬件双时计数原理对流量计输出信号进行计数 ,大大提高了流量计脉冲的计数精度 ,并利用动态链接库 (DLL)实现了Windows操作系统对温度、压力的实时数据采集和系统监控     

可信计数器监控系统的设计与实现

在数字作品交易系统中,可信计数机制有效解决了版权纠纷问题。为了确保可信计数器的正常、安全运行以及对计数器的状态、版本进行监控,提出了一种基于数字作品交易的可信计数器监控系统的方法及系统,结合 RSA 等密码技术,实现对可信计数器运行状态的实时监控和版本升级,保证在线交易数据的完整性、机密性和不可篡改。详细描述了该系统的体系结构、功能模块和安全数据结构。在数字版权保护领域具有广泛的应用前景。     

Web页面中计数器技术研究

Ｗｅｂ页面计数器能够直观地反映该Ｗｅｂ站点受关心的程度,一个好的Ｗｅｂ页计数器应该方便使用,并具有较高的性能,Ｗｅｂ页面计数器技术充分反映了动态Ｗｅｂ页面技术的发展现状,本文给出了几种实现了Ｗｅｂ页面计数器的技术,并对这些进行了比较。     

基于单片机的光电编码器位置检测系统设计

为了实现对机床设备运行状态的实时监测,设计了一种基于单片机的光电编码器位置检测系统;系统采用高性能的AVR单片机对编码器的两相位置信号进行鉴相及四倍频处理,然后通过MCS-52单片机的T2计数器进行硬件计数,同时使用MCS-52单片机的串行端口将位置数据传送至上位PC机中;采用VB6.0软件设计上位机的监控界面,实时动态显示各种编码器的位置数据;试运行结果表明,该设计不仪电路简单,且计数精度高、响应速度快,达到150kHz,适用于各种位置及角度检测场合.     

An automated bacterial colony counting and classification system

Bacterial colony enumeration is an essential tool for many widely used biomedical assays. However, bacterial colony enumerating is a low throughput, time consuming and labor intensive process since there may exist hundreds or thousands of colonies on a Petri dish, and the counting process is usually manually performed by well-trained technicians. In this paper, we introduce a fully automatic yet cost-effective bacterial colony counter which can not only count but also classify colonies. Our proposed method can recognize chromatic and achromatic images and thus can deal with both color and clear medium. In addition, the proposed method is software-centered and can accept general digital camera images as its input. The counting process includes detecting dish/plate regions, identifying colonies, separating aggregated colonies, and reporting colony counts. In order to differentiate colonies of different species, the proposed counter adopts one-class Support Vector Machine (SVM) with Radial Basis Function (RBF) as the classifier. Our proposed counter demonstrates a promising performance in terms of both precision and recall, and is robust and efficient in terms of labor-and time-savings.     

FPGA/DSP-based implementation of a high-performance multi-channel counter

A high-performance configurable multi-channel counter is presented. The system has been implemented on a small-size and low-cost Commercial-Off-The-Shelf (COTS) FPGA/DSP-based board, and features 64 input channels, a maximum counting rate of 45 MHz, and a minimum integration window (time resolution) of 24 μs with a 23 b counting depth. In particular, the time resolution depends on both the selected counting bit-depth and the number of acquisition channels: indeed, with a 8 b counting depth, the time resolution reaches the value of 8 μs if all the 64 input channels are enabled, whereas it lowers to 378 ns if only 2 channels are used. Thanks to its flexible architecture and performance, the system is suitable in highly demanding photon counting applications based on SPAD arrays, as well as in many other scientific experiments. Moreover, the collected counting results are both real-time processed and transmitted over a high-speed IEEE 1394 serial link. The same link is used to remotely set up and control the entire acquisition process, thus giving the system a even higher degree of flexibility. Finally, a theoretical model of general use which immediately provides the overall system performance is described. The model is then validated by the reported experimental results.