Figure 3.

Image index map and processed results for different values of the window size r. Each column is separated by a r. (b) All-in-focus images that are fused based on image index maps in (a). The marked areas highlighted by the red box in (b) represent the zoomed-in images (c). By adjusting r, the area affected by the filter is also adjusted. If r is 5, as shown in the first column, it did not properly express the boundary features. In the third column, most areas in the image index map are indexed. Since information is extracted from a wide area, there is a disadvantage of obtaining information in an out-of-focus area. As shown in the second column, by choosing an appropriate r, a clear fusion result can be obtained without loss of features.