高性能CMOS圖像采集系統(tǒng)設(shè)計(jì)
[Abstract]:The traditional CMOS image sensor is limited by technology, and there are some shortcomings in speed, resolution, dynamic range and readout noise. The new science-grade CMOS image sensor adopts a new integrated circuit manufacturing technology. In these aspects, there are better improvements and improvements, which provides a new direction for the development of high performance image acquisition system. At present, it has become an indispensable research tool in the fields of military industry, aviation remote sensing and medical treatment. In this paper, a high performance, miniaturization and low power consumption image acquisition system is designed based on the scientific CMOS image sensor CIS2521 of Fairchild Company. The main work of this paper is as follows: firstly, this paper designs the overall scheme of the system. Through the analysis of the key modules, such as acquisition, control, data cache and data transmission, the selection of each device is completed, and the system design scheme of Camera Link high-speed transmission interface of DDR2 SDRAM cache chip, FPGA control chip of sCMOS image sensor, is established. Then, based on the analysis of the hardware circuit, the hardware design scheme of the system is established and the schematic diagram of the hardware circuit is given. Based on the hardware circuit, the FPGA driver software program is designed, which can complete the functions of power up control, clock management and register configuration of CMOS image sensor. It can drive CMOS image sensor to work normally and output image data. Finally, the real-time on-line processing of image data is realized. The data processing module converts the Gray code to binary number, realizes the elimination of dark current and the non-uniform correction of image sensor. The 3.2 order polynomial fitting algorithm is used to correct the non-uniformity of the image, which is more accurate than the traditional two-point correction method. The maximum resolution of the image acquisition system designed in this paper is 2560,2160. In Rolling Shutter mode, the frame rate can reach 87fpsand the maximum transmission rate can reach 630MBps. the imaging test shows that, The designed high performance image sensor system can realize the normal operation of the image sensor.
【學(xué)位授予單位】:青島科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TP391.41;TP212
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