Design and Implementation of High Resolution Camera Driver Based on Embedded System
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 full 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 million CMOS camera driver on the YL-E270 development platform and shows good stability and performance,the results of text recognition show that the accuracy at least 17.5 percent enhancement compared to the image captured by the low resolution camera,and with the memory sharing mechanism to reduce 21.5 percent memory occupancy rate.