Design of JPEG image file system in corona detection system

(YU Xiao; WANG Xin; YAN Feng; SUI Yong-xin; JIN Chun-shui; Yang Huai-jiang

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Design of JPEG image file system in corona detection system

更新时间：2020-08-12

- Design of JPEG image file system in corona detection system
- Optics and Precision Engineering Vol. 13, Issue 6, Pages: 721-726(2005)
- 作者机构：
  
  1. 空军航空大学,吉林长春,130022
  2. 吉林大学计算机科学与技术学院,吉林长春,130012
  3. 中国科学院研究生院北京,100039
  4. 中国科学院长春光学精密仪器机械与物理研究所应用光学国家重点实验室,吉林长春,130033
- 作者简介：
- 基金信息：
- DOI：
  CLC： TP317.4
- Received：22 June 2005，
  
  Revised：18 August 2005，
  
  Published Online：30 December 2005，
  
  Published：30 December 2005
- 稿件说明：
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(YU Xiao, WANG Xin, YAN Feng, et al. Design of JPEG image file system in corona detection system[J]. Optics and precision engineering, 2005, 13(6): 721-726.
DOI：

(YU Xiao, WANG Xin, YAN Feng, et al. Design of JPEG image file system in corona detection system[J]. Optics and precision engineering, 2005, 13(6): 721-726. DOI：

摘要

针对检测及定位紫外电晕的问题

介绍了利用TMS320DM642高速DSP芯片设计的一种紫外电晕探测系统。该系统采用可见光和紫外光两台相机在同一视场采集图像

在LCD上实时显示两路信号经处理后的叠加图像

便于在观测电晕的同时确定电晕产生的部位。用户可将感兴趣的画面截获后压缩成JPEG图像存储到系统内部的FLASH中

并可以在LCD上浏览这些画面或通过USB接口将它们下载到PC机中。设计了一种用于存放截图的JPEG图像文件系统

给出了文件系统的原理框架

讨论了利用RF5参考框架实现JPEG编解码算法的方法

详细设计和实现了文件系统的存储空间组织、目录区结构和初始化、读写等基本操作。经测试

对分辨率为720×576的图像进行JPEG编、解码的平均时间分别为10.5 ms和9.6 ms;耗时较多的截图保存操作所需时间约为4~6 s;文件系统可以存放约70个图像。

Abstract

An ultraviolet corona detecting system was proposed for detecting and locating corona

in which TMS320DM642 was used as primary processor. A visible camera and an ultraviolet camera were used for inputing in the system. Two cameras have same visual field

so the processor can compose those input videos

and then display the result on LCD for user easy to observe and locate the corona. The interested images can be captured and saved into the internal FLASH of the system before it is encoded to JPEG files. The images in the internal FLASH can be displayed on LCD or downloaded into PC using USB interface. A kind of JPEG image file system was designed for saving these images

and implementation of JPEG algorithm based on RF5 was discussed. The design of storage space

structure of directory area

and the implementations of basic operations such as initialization

reading and writing in the file system were particularly discussed. The experimental results show that it respectively spends 10.5 ms and 9.6 ms for JPEG encoding and decoding operations on the image of 720×576 resolution

and it spends about 4~6 s for capturing and saving operations

and 70 images can approximately be saved in the file system.

关键词

Keywords

references

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