within a certain part of an object coming from the same image rather than from
different images. Consistency checking can be applied to refine the fusion map
for this purpose. For example, a simple majority filter with different kernel sizes
can improve image fusion performance [23]. The fusion map can be smoothed
by repeatedly applying a 3 3 median filter until it no longer changes [33].
16.5.5.3 Reassignment
On the other hand, as a consequence of selecting maximum absolute value
coefficients in the wavelet domain, the fusion may yield results that are ‘‘non-
convex’’ combinations of the pixel values of the input images [25]. In such a case
the resulting composite image will have pixels with values outside the dynamic
range of all the input images.