CMOS star sensor image acquisition and real-time star centroiding algorithm
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摘要: 利用CMOS图像传感器技术的低功耗和开发简单等优点,设计了新型CMOS星敏感器的图像采集驱动电路.该电路设计以现场可编程门阵列(FPGA)为核心,配以静态存储器和并口通讯功能,实现了图像的采集、存储和输出.同时根据4连通域图像分割的原理,在FPGA内部设计了一个数字电路模块,以实现该星敏感器的实时星点定位功能.该模块由于采用了流水线结构,可以和图像采集同步完成星点质心定位算法,减少了向星敏感器数据处理单元中的精简指令集计算机(RISC)的数据传输量和RISC进行星图跟踪和识别的工作量,提高了星敏感器的总体工作性能.对比软件处理结果,对星敏感器的图像采集和质心算法硬件电路进行了验证.Abstract: Utilizing low power consumption and low-cost development performance of CMOS(complementary metal oxide semiconductor) image sensor technology, a novel CMOS star sensor image collection system was designed. Consisting of FPGA(field programmable gates arrays), SRAM and parallel ports, it can accomplish the collection, save and output of star image. By the principle of 4 connection domain image segmentation, a circuit model was designed to realize the star centroiding function of star sensor in FPGA. The model implements the real-time star location algorithm synchronously with image acquisition by adopting pipelining configuration, reduces the workload of data transmission, image tracking and recognition of RISC in data processing unit of star sensor, and improves the performance of star sensor system. Comparing with the software processing results, the functions of star sensor image collection and centroiding hardware circuits were validated.
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Key words:
- sensors /
- image collection /
- digital circuits /
- centroids
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