基于Linux内核framebuffer的图像采集与显示系统设计

Design of Image Acquisition and Display System Based on Linux Kernel Framebuffer

针对工业控制领域的自动化生产需要,设计了一种基于Linux内核驱动framebuffer和UVC类型摄像头的图像采集与显示系统;以三星公司的S5PV210微控制器为控制单元,基于Linux内核移植了framebuffer驱动,调用Linux内核提供的V4L2编程接口,基于Epoll架构进行多路图像采集;对采集到YUVU格式图像进行编码,转化成BMP和JPEG保存,以便后续对图片做相应的应用开发;最后调用libjpeg库函数对jpeg图片进行解码,并显示在TFTLCD屏幕上;实验结果显示:能够采集到图片数据,并能成功在LCD屏幕上显示,framebuffer驱动能正常工作,满足工业自动化生产图象处理的需求。

According to the need of automatic production in the field of industrial control,an image acquisition and display system based on embedded Linux kernel framebuffer and USB Video Class type camera is designed.The system uses Samsung S5Pv210 as core controller,and transplated framebuffer driver based on Linux kernel.Calling V4L2 programming interface provided by the Linux kernel,using the UVC types of USB camera multi-channel images acquisition based on Epoll architecture.The image data collected YUVU format is encoded,saved as BMP and JPEG file formats for subsequent development and application.Libjpeg library called by the system to decode JPEG images,and make image displayed in the TFT LCD screen.The result of experiments show that the images can be collected,saved and displayed in the LCD screen,and framebuffer driver can work so that can meet the needs of image process in automatic production.