Short-wave Infrared Imaging Under Low Illumination And Its FPGA Implementation

Short-wave infrared,with its unique spectral response characteristics in a dark background environment,allows observers to still observe the details of the target under low light,making short-wave infrared imaging technology to make up for low-light night vision and mid-and long-wave infrared imaging.Means to detect gaps between bands.The application of short-wave infrared has gradually diverged from the original military field to many fields such as production and life.The research on short-wave infrared has been paid more and more attention at home and abroad.Due to the sensitivity of the detection pixel,the output response of the detection pixel in an excessively bright or dark environment reflects the performance of the imaging system.Based on this,a short-wave infrared imaging system is designed in this subject,and its imaging in low-light environment is analyzed and studied.Short-wave infrared detectors manufactured with InGaAs as raw materials have higher sensitivity and detection rate,have better performance at room temperature,and are mainstream devices for short-wave infrared imaging.FPGA(Field Programmable Logic Gate Array)has the advantages of rich resources,short development cycle,high integration,good performance,and real-time performance.It is often used as a platform for image processing and signal conversion in short-wave infrared imaging.This subject starts from the overall structure of the short-wave infrared imaging system,and is carried out in accordance with hardware circuit design,system software design,performance testing,and result analysis.Among them,the design of the core FPGA configuration circuit,the detector drive circuit,the TEC temperature control system,the ADC conversion circuit,and the storage circuit constitute the main part of the hardware design.Because the original input image needs to be compatible with traditional monitors when it is finally output,the system uses a combination of FPGA and LTC2271 to perform non-uniformity correction,noise suppression,and image detail enhancement on the input 640 × 512 original infrared image.Processing method,and finally get the PAL standard analog video output with the size of 720 × 576.After the imaging experiment,according to the experimental results,the images before and after the correction are compared,and it is concluded that the short-wave infrared imaging system in the low-illumination environment designed by this subject has good visual effects.