Design of a night vision system with laser illumination based on DSP

Yang Liu; Wen Xiao; Haiyang Wang

doi:10.1117/12.790905

22 February 2008 Design of a night vision system with laser illumination based on DSP

Yang Liu, Wen Xiao, Haiyang Wang

Proceedings Volume 6622, International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology; 66221M (2008) https://doi.org/10.1117/12.790905
Event: International Symposium on Photoelectronic Detection and Imaging: Technology and Applications 2007, 2007, Beijing, China

Abstract

According to characteristics of infrared imaging in darkness, a night vision system with laser illumination based on embedded structure was developed. The system detected remote target at night with a high-power infrared semiconductor laser diode as illuminating source, overcoming the defect of weak energy in passive imaging system. A reliable driver was designed to stabilize output power of the laser. Technologies were adopted to improve performance of the source greatly, such as slow start-up circuit, current interruption protection and over-current limit circuit. The illuminating source met the needs of detection in various distances and achieved satisfying transmission effect. The imaging part, where TMS320C6713 served as the center processor, realized functions of image capture, processing and export. As is known, infrared image has defects of small dynamic range and low contrast. Otherwise, the source, environment and electronic devices brought various noises that reduced image quality. Algorithms of image enhancing and noise inversion were designed correspondingly, which filtered noises and restrained background influences to gain high contrast of the target. Compared with traditional image processing based on computer, the adoption of DSP not only greatly improved image quality, but also made this system miniature and portable. The system could capture real-time image of remote target in 3~5km accurately in starless nights or under poor weather conditions.

Citation Download Citation

Yang Liu, Wen Xiao, and Haiyang Wang "Design of a night vision system with laser illumination based on DSP", Proc. SPIE 6622, International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology, 66221M (22 February 2008); https://doi.org/10.1117/12.790905

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KEYWORDS

Digital signal processing

Image processing

Imaging systems

Detection and tracking algorithms

Night vision systems

Semiconductor lasers

Signal processing

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