Anti-laser interference methods for compressive spectral imaging based on grayscale coded aperture

Abstract

Coded aperture snapshot spectral imaging (CASSI) captures three-dimensional (3D) spectral images by one or several snapshots two-dimensional (2D) measurements. At present, in practical application of spectral imaging systems, artificial interference such as laser irradiation is wide-spread. When CASSI system is irradiated by intense laser, optoelectronic image sensor will inevitably be dazzled, leading to the loss of compressive sampling information, thereby reducing the reconstruction accuracy of spectral images. This paper establishes the imaging model of CASSI system under laser interference and proposes a grayscale coding design method. Through the design of a reasonable and feasible feedback model, the grayscale coded aperture is calculated according to the measurements of CASSI system in real time feedback. The intensity of the incident light of the system is modulated to reduce the power density on the sensor, thus avoiding sensor saturation, and improving the anti-laser interference threshold of the CASSI system. Simulation results show the improvement of reconstruction accuracy when grayscale coded apertures are employed.