Design And Implementation Of Image Acquisition System Based On FPGA

Image acquisition and transmission technology is used more and more widely in the fields of video surveillance, information processing, industrial controlling and scientific modeling, which cry for the speedof signal capturing and transmitting of a system. With the perfection of micro-electronics and improvement of electronic design ability, the prices of high performance image sensors go down while the applicable fields of image sensors grow. Image acquisition devices, as the front-end of multi-media system, are responsible for the image capture, store, transform and transmit. So it’s important to design an image acquisition system featured large volume, real-time, high cost-effective and easy feasibility.This paper introduces the basic knowledge and technics to build high-speed image acquisition system. In accordance with specific application demands, we proposes image acquisition system based on FPGA(field programming gate array) for linear image sensor and array image sensor. In linear image acquisition system, CIS(contact image sensor) are used to satisfy the constraints of space, high-speed ADC(analog to digital convertor) to quantize signals and Altera FPGA to control, capture and transmit image to back-end DSP.In array image acquisition system, two CMOS image sensors are used to generate parallax image pair, which are then cached, transformed and transmitted via DVI(digital video interface) to LCD(liquid crystal display) panel. With the help of shutter glasses, the system employs Xilinx FPGA to control working flow to display stereoscopic video.These two image acquisition systems proposed in this paper are well tested. The one for CIS is used in new national standard banknote identifier, while the other for CMOS is used in digital stereoscopic microscope. By practical examination, it is proved to meet the requirements of high-speed, real-time, low cost. What’s more, the capability of field programming results in excellent expansibility and compatibility. These systems can be embedded in other applications and have engineering value.