高精度双通道红外图像采集与VGA显示系统的设计  

Design of High Precision Dual-channels Infrared Image Acquisition and VGA Display System

作　　者：宋亚军[1] 倪国强[1] 高昆[1] 秦庆旺[1] 

机构地区：[1]北京理工大学信息科学技术学院光电工程系,北京100081

出　　处：《激光与红外》2007年第B09期1010-1012,1017,共4页Laser & Infrared

基　　金：973项目支持

摘　　要：为了更好地满足红外图像处理系统对高精度图像采集与处理的需求,本文设计了10bit量化精度的视频采集与显示系统,选用10bitTVP5147视频解码芯片和ADV7123型视频编码芯片为核心器件,提供两路10bit数字视频输出、一路10bit数字视频输入的TTL/LVDS接口,以及一路CVBS外同步信号输出,由1片ATmega16L单片机和3片XC95144XL CPLD器件分别实现视频编/解码芯片的在线配置和接口逻辑控制。寄存器配置程序具有人机界面,通过PC的串口完成对TVP5147主要寄存器的配置。在CPLD中采用Verilog硬件描述语言设计10bit的YUV空间到RGB空间的实时色域转换功能模块,以实现系统VGA模拟显示的功能。实验表明,该系统有效克服了传统8bit空间转换中由于二次取整数而存在的带状线和轮廓线的缺陷,具有通用性好、灵活性好、功耗低和精度高等特点,完全可以满足图像融合、目标识别等图像处理应用系统的要求。To meet the requirement of high precision image acquisition and process for infrared image processing system, a 10bit quantization precision video acquisition and display system is presented. The key components of this system are the 10bit video decoder of TVPS147 and the video encoder of ADV7123. The whole system provides one channel synchronous CVBS signal output, two channel TI＇L and LVDS interfaces of 10bit digital video output and one channel 10bit video input. One ATmega16L microcontroller and three XC95-144XL CPLDs are used to implement the on-line configuration of decoders and coder and logic control of TTL/LVDS interfaces. A register configuration program with human-machine interface is designed in the microcontroller, which could configure most registers of TVPS147 through the serial port of a personal computer. For the requirement of VGA display support, the 10bit realtime conversion from YUV color space to RGB color space is implemented via the Verilog hardware description language in the CPLD. The experiment results show that this system not only eliminates strip and contour line phenomena caused by quadratic integer truncation in the color space conversation of 8bit system, but also has features of low power, high precision and strong versatility, which makes it suitable for the image processing systems of image fusion, target recognition and so on.

关 键 词：红外图像 10bit 视频采集 VGA 

分 类 号：TP751[自动化与计算机技术—检测技术与自动化装置] TP391[自动化与计算机技术—控制科学与工程]