一种基于EASSF的红外与可见光图像视觉保真度融合

Visual Fidelity Fusion of Infrared and Visible Image Using Edge-Aware Smoothing-Sharpening Filter

最近,多尺度特征提取被广泛应用于红外与可见光图像融合领域,但是大多数提取过程过于复杂,并且视觉效果不佳。为了提高融合结果的视觉保真度,本文提出一种基于边缘感知平滑锐化滤波器(Edge-Aware Smoothing-Sharpening Filter,EASSF)的多尺度图像融合模型。首先,提出一种基于EASSF的多尺度水平图像分解方法对源图像进行分解,得到水平方向上的多尺度纹理成分和基础成分;其次,采用最大值融合规则(Max-Fusion, MF)融合纹理成分,避免图像细节信息的丢失;然后,通过一种感知融合规则(Perceptual-Fusion, PF)融合基础成分,捕获显著性目标信息;最后,通过整合融合后的多尺度纹理成分和基础成分得到融合图像。实验通过分析感知融合系数,对比融合结果的客观数据得出红外与可见光图像融合在多尺度EASSF下较为合适的取值范围;在该取值范围内,本文提出的融合模型同一些较为经典和流行的融合方法相比,不仅解决了特征信息提取的复杂性,而且通过整合基础成分的显著性光谱信息,有效地保证了融合结果的视觉保真度。

Recently, multi-scale feature extraction has been widely used in the field of infrared and visible image fusion;however, most extraction processes are too complex, and the visual effect is not good. To improve the visual fidelity of the fusion result, a multi-scale horizontal image fusion model based on an edgeaware smoothing-sharpening filter(EASSF) is proposed for infrared and visible images. First, to obtain multiscale texture components and basic components in the horizontal direction, a multi-scale horizontal image decomposition method based on the EASSF is proposed to decompose the source image. Second, the maximum fusion rule is used to merge texture components, which can avoid loss of information detail. Then,to capture salient target information, the basic components are fused via the perceptual-fusion rule. Finally, the fused image is obtained by integrating the fused multi-scale texture components and basic components. By analyzing the perceptual fusion coefficient of PF, the appropriate range of infrared and visible image fusion in the multi-scale EASSF is obtained through the objective data of the fusion results. In this range, compared with several classical and popular fusion methods, the proposed fusion model not only avoids the complexity of feature information extraction, but also effectively ensures the visual fidelity of fusion results by integrating the significant spectral information of basic components.