Figure 1.

Different approach to extract tiles at multiple magnification levels. The first row shows an example of grid multi-scale tiles. Each tile at 5x can be linked with 4 tiles at 10x and 16 tiles at 20x. Hence, there is a 1:N mapping between tiles from the highest magnification level to the next lower magnification level. Note that for clarity we only show one such tile in this illustration. The second row shows an example of concentric tiles. In this case, each tile at 20x is considered as the centroid for the tiles at lower magnification levels, resulting in a 1:1 correspondence between tiles at different magnifications. When using concentric tiles there will be large overlaps between tiles at lower magnification levels. When using grid tiles, there is no such overlap.