基于宽带滤波调制的光谱成像技术实验研究

Experimental Study of Spectral Imaging Technique Based on Broadband Filtering

基于宽带滤波调制的计算光谱成像技术是航空航天光谱成像遥感领域中一种极具应用潜力的新型计算光谱成像技术。目前该技术主要应用于光谱测量仪器的小型化领域,缺少针对光谱成像遥感领域的相关研究。因此,针对该技术应用于光谱成像遥感领域的可行性开展实验研究。首先简要介绍宽带滤波调制光谱成像技术的基本原理;然后针对空间光学遥感工程的实际需求,采用彩色玻璃滤光片结合工业相机搭建宽带滤波调制光谱成像的原理样机系统,并对其进行光谱成像实验验证;最后分析评价所获取的光谱图像,研究影响该技术的测量精度及其主要影响因素。实验结果表明,该技术的重建光谱准确度约为23%,获取的光谱图像边缘也较为清晰,噪声约为23 dB。

Computational spectral imaging based on broadband filtering modulation is a new type of computational spectral imaging technology with great application potential in aerospace spectral imaging remote sensing field. At present, this technology is mainly applied to the miniaturization of spectral measurement instruments, but there is a lack of relevant research in the field of spectral imaging remote sensing. Therefore, the feasibility of the application of this technology in the field of spectral imaging remote sensing is studied experimentally. First, the basic principle of broadband filtering modulated spectral imaging is briefly introduced. Then, aiming at the practical demand of space optical remote sensing engineering, the principle prototype system of broadband filtering modulation spectral imaging is built by using color glass filters and industrial camera, and its spectral imaging capability is verified experimentally. Finally, the obtained spectral images are analyzed and evaluated, and the main factors affecting the measurement accuracy of the technology are studied. Experimental results show that the accuracy of spectral reconstruction is about 23%, and the edge of spectral image obtained by this technique is clear, and the noise is about 23 dB.