Data from the Nikon D3 was divided into ten regions (Figure 69). Each nearby region has some overlap areas. For example region B has overlapped area with region C and region A. These overlapped areas need some photos in common. Therefore the sum number of all photos from each part is bigger than the number of photos in the
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original dataset. In this case from A to J the total number of photos is 522, the number in original dataset is 494. The resolution of the photos was reduced 30% to 2979*1982. Each sub-dataset was computed separately. The results are shown in Table 11. Although the resolution has decreased by 30%, generated vertices from the the dense reconstruction process remain stable, generated vertices from the CMVS reconstruction have reduced by around 50%. The total processing time has reduced dramatically, as shown in Figure 70. By using sub-dataset, the processing time has decreased by 87.57% in the dense reconstruction and by 90.2% in the CMVS reconstruction.