嵌入式系统下高像素摄像头驱动程序设计与实现

Design and Implementation of High Resolution Camera Driver Based on Embedded System

在嵌入式平台下,高像素摄像头驱动的开发受到嵌入式处理器速度有限和系统资源有限的限制.为了更好地解决这一问题,本文基于PXA270嵌入式平台,使用Q u ick Capture接口技术,采用DMA描述符链的数据传送方式和双RAM池策略,并采用内存共享设计思想,降低了数据行走路径,在提高了数据传送速率的同时充分利用嵌入式系统的有限内存资源,降低了内存占用率,保证了获取高分辨率图像的要求.最终在YL-E270开发板上实现了分辨率为400万的CMO S摄像头驱动,通过实际测试,结果表明本文设计的高像素摄像头驱动程序具有良好的稳定性和性能,与低像素摄像头采集的文字图像相比,文字识别的正确率可提高17.5%,采用内存共享机制可减少21.5%内存占用率.

Based on the embedded platform, the development of high resolution camera driver is limited by the limited speed of embedded processor and the system＇s limited memory resources. In order to solve this problem well, this paper based on Quick Capture Technology for PXA270 embedded platform, using the memory sharing design thought to reduce the data transmit path, with the data transmission of DMA Descriptor Chain and double-RAM strategy to make lull use of the limited memory resources of embedded systems while improving the data transfer rate, and meet the request of access to high resolution images. Eventually realizes this 4 mil- lion CMOS camera driver on the YL-E270 development platform and shows good stability and performance, the results of text recog- nition show that the accuracy at least 17.5 percent enhancement compared to the hnage captured by the low resolution camera, and with the memory sharing mechanism to reduce 21.5 percent memory occupancy rate.