Vega software is widely used for infrared simulation. This study proposes a method for evaluating the effect of infrared objective stealth based on Vega software combined with image feature point matching technique. Vega software is used to simulate a group of infrared images before and after target stealth. Afterwards, feature points are acquired from the target images. Hausdorff distance between feature points is then calculated to quantify similarity between target before and after stealth. Experimental data show that a larger Hausdorff distance corresponds with decreased similarity between target before and after stealth, which proves better stealth effect.

Abstract. Emissivity measurement is the foundation of target infrared radiation characteristic analysis. The theoretical analysis, design, and implementation results of an indirect emissivity measurement approach for field targets are presented. With a blackbody as the active radiation source, an experimental facility is established to alter environmental radiation. Experiments are performed with different samples. Results show that this approach has a maximum error of 1.9% as opposed to that of direct measurement. The experiment verifies the feasibility and accuracy of the proposed method, which could meet the actual needs of in-situ emissivity measurement. The method provides the necessary means for non-contact infrared radiation field analysis.