*2.9. Generalized IHS Method*

For the fusion process, the generalized IHS method (GIHS) [5] proposed by Tu et al. was used. The intensity was calculated using Equation (6), and Equation (18) was applied to red-, green-, and blue-band RGB images.

$$\begin{bmatrix} MS\_{\text{J}\text{od}}^{\text{lingh}} \\ MS\_{\text{gvn}}^{\text{lingh}} \\ MS\_{\text{J}\text{u}\text{u}}^{\text{lingh}} \end{bmatrix} = \begin{bmatrix} MS\_{\text{rad}}^{\text{lau}} + I^{\text{làgh}} - I^{\text{lau}} \\ MS\_{\text{gvn}}^{\text{lau}} + I^{\text{là}\text{gh}} - I^{\text{lau}} \\ MS\_{\text{bhu}}^{\text{lau}} + I^{\text{là}\text{gh}} - I^{\text{lau}} \end{bmatrix}, \tag{18}$$

where *MShigh red* , *MShigh grn* ,*MShigh blu* , *MSlow red* , *MSlow grn*, and *MSlow blu* are the intensities of the high-resolution and low-resolution RGB images.
