Image Acquisition And Processing System Of A Zynq Based Micro-hyper-spectrometer

The hyperspectral imaging can not only provide the spectral information of the substance to be measured,but also provides the position information,which enables the qualitative,quantitative,and localized analysis of the substance.Most of the hyperspectral acquisition systems are based on the principle spectroscopy or filter spectroscopy.It is difficult to realize miniaturization of the spectrometer,because hyperspectral data analysis needs to be processed by computers,and the local data processing and analysis of the spectrometer cannot be realized.With the development of MEMS technology,a type of novel CMOS hyperspectral sensor was developed recent years.This sensor used CMOS surface coating to achieve spectroscopy,without the help of mechanical spectroscopy,so it can provide the possibility of miniaturization of spectrometers.In this paper,one such CMOS hyperspectral sensor developed by IMEC was used.The Zynq platform(XC7Z020)was chosen as the main control chip.An embedded micro-hyper-spectrometer was designed and implemented,and the embedded local hyperspectral data separation and image processing were completed.The works are as following:1?System and hardware structure design,including the system design,the hardware circuit design,the mechanical design,taking into account the needs of the entire system,such as portable,wireless transmission.2?Driving and data acquisition of the CMOS hyperspectral sensor.Using Zynq's PL to implement the timing driving of the CMOS hyperspectral sensor,and receiving the sensor's hyperspectral image data output,and quickly storing to the DDR3 SDRAM through the DMA(Direct Memory Access)module.3?Local hyperspectral data separation and image processing based on Zynq.The original 25-band mixed hyperspectral image data were separated into 25 independent single-band spectral images.This method realized spectral video dynamic preview and remote real-time view of hyperspectral data.The median filter method was used to preprocess the hyperspectral image in the FPGA,which effectively filtered out the noise and provided a reliable guarantee for subsequent spectral image analysis for the future.The micro-hyper-spectrometer had a time resolution of 20 ms,a spectral resolution of 10 nm,and a spectral video frame rate of 50 FPS.It can meet the requirements of real-time focusing and dynamic information capture under high time resolution applications,and realize local acquisition and processing of the hyperspectral data.It is portable and has important potential application value.