Hardware Design Of Homocentric Wide-field And High-resolution Imager

Traditional imaging,as a “what you see is what you get” detection mode, exists some fatal defects.The resolution of the traditional images is low, especially in the infrared imaging system, monitoring the earth in the nighttime. Low resolution sensors leads to the poor image resolution. In certain applications, it is hoped that getting enough information from the largest possibleangle space. However the wide-field and high resolution imaging systems are always containing complex machine structure,blind spots and image distortion.The proposed homocentric lens system can not only solve the above problems, but also meet the requirements of wide-field and high-resolution.Base on small distortion and large field features of ball lens,the homocentric, wide-field and high-resolution imager,using a homocentric objective system and Multi-aperture micro-camera array,make multi-frame which have overlapping field of view reconstruct to be an image with computational reconstruction techniques. Based on the structure above,this paper presents an image acquisition and transmission hardware system made up of cmos sensors and cell image circuit,ensuring capture and transmit the large image data. The system set the CMOS Sensors as the micro camera and design the CMOS sensor drive circuit.Taking advandtage of high speed and parallel processing features of FPGA,the system can real-time capture multi-CMOS sensor data. The architecture consisted of FPGA and DDR3 helps to cache the image data,meeting the storage bandwidth and capacity requirements.Finally,Gigabit Ethernet achieves the data transmission to graphics workstation.Combination of the above, in the paper, firstly we discuss the development of the high-resolution and wide-field imaging system and design the imager hardware systems, combined with requirements of the system. For the two difficult problems, the large data collection and storage of the hardware circuit and high-speed transmission, we complete hardware circuit design based on FPGA, with the high-capacity storage unit of DDR3 and the transmission mode of Gigabit Ethernet. Then we debug the hardware circuit and verify the system function. Finally the results indicates that the hardware system can achieve the purpose of high-resolution wide-field imaging.According to the results of the debugging of hardware system, the experiment shows that the homocentric wide field and high resolution imager hardware design can collect and store a large amount of image data with strong real-time performance,which has reached the expected design requirements.At the same time,the hardware circuit of the system has certain universality,as the FPGA core board adopting the FMC interface.FPGA core board offers standard mezzanine card size,connectors and module interface,which can be used for the related processing platform.