基于 CCD 和小波变换的数粒机控制系统设计

Design of Control System for Counting-machine Based on CCD and Wavelet Transform

中文关键词: 数粒机  DSP  CCD  小波变换  边缘检测  控制系统

英文关键词: counting-machine  DSP  CCD  wavelet transform  edge detection  control system

中文摘要:

      目的 针对数粒机高速、高精度的控制要求， 利用 TMS320F2812 型 DSP与线阵 CCD、ARM9 微型控制器及其他硬件设备相结合， 设计基于图像处理的数粒机控制系统。 方法 首先介绍了数粒机的机械结构和工作原理，然后对药粒CCD 检测计数系统进行了全面设计，最后采用基于小波变换的图像边缘检测算法对药粒的形状和尺寸进行检测， 设计了基于 DSP和小波变换的药粒图像边缘检测系统，以判断是否有药粒通过检测通道。 结果 该控制系统运行稳定， 可以用于直径在 0.32 mm以上各种规格、形状的颗粒状药品的检测计数， 工作速度达 3000~8000粒/分钟。 结论 基于小波变换的图像边缘检测算法避免了噪声和伪边缘的出现， 实现了数粒机的精确计数， 计数精度达到 99.99%， 受粉尘影响小，在实际生产中取得了明显的应用成效。

英文摘要:

      Objective In order to meet the control requirements of high speed and precision for counting-machine, a control system for counting-machine based on image processing was designed by using TMS320F2812 DSP combined with linear array CCD, ARM9 microcontroller and supporting hardware. Methods Firstly, the mechanical structure and working principle of counting-machine were discussed. Then the comprehensive design process of the pill CCD detector counting system was given. Finally, using edge detection algorithm based on wavelet transform to detect shape and size of pill， the image edge detection system based on DSP and wavelet transform was designed to determine whether there was pill passing detection channel. Results The control system was stable. It could be used for the detection count of pills with various specifications and shapes given that the diameter was larger than 0.32 mm, and the working speed reached up to 3000-8000 tablets / min. The edge detection algorithm based on wavelet transform could avoid the appearance of noise and false edges and achieve accurate counting of the counting-machine. The accuracy was 99.99%, hardly affected by small dusts, and it has achieved significant application results in the actual production.