Abstract
With medium wave infrared (MWIR) focal plane array-based (FPA) compressive imaging (CI), high-resolution images can be obtained with a low-resolution MWIR sensor. However, restricted by the size of digital micro-mirror devices (DMD), aperture interference is inevitable. According to the system model of FPA CI, aperture interference aggravates the blocky structural artifacts (BSA) in the reconstructed images, which reduces the image quality. In this paper, we propose a novel DMD mask design strategy, which can effectively suppress BSA and maximize the reconstruction efficiency. Compared with random binary codes, the storage space and computation cost can be significantly reduced. Based on the actual MWIR FPA CI system, we demonstrate the proposed DMD masks can effectively suppress the BSA in the reconstructed images. In addition, a new evaluation index, blocky root mean square error, is proposed to indicate the BSA in FPA CI.
Highlights
Medium wave infrared (MWIR), of which the spectrum region is between 3 and 5 μm, has many imaging advantages beyond visible spectrum, such as night time observation and penetrating fog imaging [1]
It is obvious that the proposed digital micro-mirror devices (DMD) masks can effectively reduce the blocky root mean square error (BRMSE) of the reconstructed high-resolution images, which means the blocky structural artifacts (BSA) caused by aperture interference in MWIR focal plane array-based (FPA) compressive imaging (CI) is effectively suppressed
The aperture interference reduces the practicality of the MWIR
Summary
Medium wave infrared (MWIR), of which the spectrum region is between 3 and 5 μm, has many imaging advantages beyond visible spectrum, such as night time observation and penetrating fog imaging [1]. An elaborate design for a DMD mask could alleviate the aperture interference in the low-resolution MWIR images obtained by the FPA sensor. The direct application of Hadamard matrix for DMD masks leads to obvious variations of light and dark areas distribution across the low-resolution images. Due to the aperture interference phenomenon, BSA has been observed in reconstructed high-resolution MWIR images. We further explore the aperture interference phenomenon in the MWIR FPA CI system, and focus our attention on DMD masks design to suppress the BSA.
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