Stray light correction for medium wave infrared focal plane array-based compressive imaging.

Abstract

With focal plane array-based (FPA) compressive imaging (CI), high-resolution medium wave infrared (MWIR) images can be reconstructed by a low-resolution FPA sensor. However, in MWIR FPA CI system, the stray light is inevitable, which reduces the image contrast and increases the blocky structural artifacts of the reconstructed images. In this work, we focus on the stray light in MWIR FPA CI system. This paper investigates the sources of stray light in MWIR FPA CI system and modifies the systematic radiation model. According to the systematic computation model, we illustrate that stray light impedes the accurate sampling of compressive measurements in the MWIR FPA CI system, which may increase the blocky structural artifacts in the reconstructed high-resolution images. With the help of digital micro-mirror device modulation, we propose an operational method to substantially correct the effect of the stray light in MWIR FPA CI system, which can improve the image contrast and reduce the blocky structural artifacts of the reconstructed images, while not significantly increasing the cost of image acquisition and computation. Based on the experimental results obtained from the actual MWIR FPA CI system, we have verified the effectiveness and practicability of the proposed stray light correction method.