To fuse visible and NIR images, we start by transforming the visible
RGB image into a luminance-chrominance color space. We obtain a
one channel NIR image containing intensity data [1].
Let I0 denote an image (visible or NIR), the extracted luminance
of the visible image is denoted as V0 and the NIR image as N0. Both
are the input for the image fusion algorithm. Its output is the fused
luminance image F0