实现高分辨力图像传感器高帧率输出的方法.pdf

第32卷第6期
光学仪器
Vol, 32, No, 6
2010年12月
OPTICAL INSTRUMENTS
D
ecem
文章编号:1005-5630(2010)060020-04
实现高分辨力图像传感器高帧率输出的方法
朱颖达·2,杨鸣',3
(1.宁波大学信息科学与工程学院,浙江宁波315211;2.宁波大学机械工程与力学学院,浙江宁波315211
3.浙江省医用光电仪器高新技术研究开发中心,浙江宁波315211)
摘要:论述了一种基于FPGA(现场可编程门阵列)的提高CMOS输出帧率的方法。高分力
图像传感器的输出帧率只有十几帧/g基至更低,系统将同一帧的因片重复输出,从而提高后续
的输出帧率,使图像信号能够直接输出至VGA显示器。硬件电路使用图像传感器MT9D131、
FPGA芯片 Cyclone I EP2C8Q208C8N和图像D/A转换芯片ADV7123组合,软件使用 verilog
HDL语言,将图像感应器得到的图像数据存入 SDRAM(同步动态随机存储器),并将其转換为
RGB格式的图像数据输出至像D/A转换芯片ADV7123,同时在FPGA中设置写FIFO模块
与读FIFO模块以避免跨越时钟域可能导致的工作不稳定的问題。
关键词:FPGA;VGA;高分辨力;图像传感器
中图分类号:TP273文献标识码:Adoi:10.3969/j.iss1005-5630.2010.06.005
Method for achieve high frame rate output from highresolution image sensor
ZHU Yingda.2, YANG Ming
(1. The Faculty of Information Science and Engineering, Ningbo University, Ningbo 315211, China
2. The Faculty of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China
3. Hightech Medical Optoelectronic Equipment Research and Development Center
in Zhejiang Province, Ningbo 315211, China)
Abstract: A reliable and efficient design based on FPGA(Field-programmable gate array) has
been discussed in this paper, which will improve the output frame rate of CMOS image sensor.
The output frame rate of high-resolution image sensor is only 10fps or less. Data of the same
frame can be output repeatedly in this system to raise the FPS so that the image can be output
to VGA( video graphics array )monitors. Image sensor MT9D131, FPGA chip, Cyclone I
EP2C8Q208C8N and ADV7123 are assemble in hardware circuit, while verilog HDL is used in
software. Image data received from the sensor are saved into SDRAM(synchronous dynamic
random access memory and then converted into RGB format, in the end the image data are
output to D/A chip ADV7123. At the same time a write-fifo module and a read-fifo module
in FPGA should be setup to avoid the instability result of crossing clock regions.
Key words: FPGA; VGA, high-resolution; image sensor
引言
随着CMOS图像传感器制造工艺的发展,其获取图像的分辨力越来越高,但是输出帧率比较低,无法
收稿日期:2010-06-13
作者简介:朱颖达(1979-),男,浙江宁波人,硕士研究生,主要从事嵌入式技术与应用方面的研究。
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