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QUALITY ASSESSMENT CRITERIA FOR IMAGE FUSION IN MULTISPECTRAL OPTICAL-ELECTRONIC SYSTEMS

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The problems related to fusion of digital images in multispectral optical-electronic systems are considered. The presented analysis of the procedure of fusion image creation is used as a base for development of criteria of the resulting image quality evaluation with the account for spatial distortion and brightness change. To evaluate the quality of spatial transformation at image fusion, it is proposed to use such criteria as the dispersion of brightness levels difference for original image and image after spatial transformation, and the correlation coefficient for initial (without spatial distortion) and the transformed images. To assess the quality of brightness transformation in fusion image, the cross-entropy value is calculated to reduce the influence of the noise component of the image on the information quantity estimate. Another criterion is a characteristic of symmetry distribution of the fusion image Fourier spectrum – excess of Fourier spectrum – which allows to define the contrast of the image by the frequency components.

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