Fig. 1. Overall flowchart of algorithm

Fig. 2. General schematic of scale slip algorithm

Fig. 3. Structure of progressive network model with upsampling ratio of 4

Fig. 4. Structure of single layer upsampling unit

Fig. 5. Aeroengine turbine blade and its measurement results. (a) Aeroengine turbine blade; (b) structured light measurement data; (c)--(f) microscopic measurement data of holes 3, 4, 6, and 8 in Fig. 5(a)

Fig. 6. Registration process diagrams of hole 6. (a) Raw microscopic point cloud; (b) scale slip microscopic point cloud; (c) downsampling microscopic point cloud; (d) original structured light point cloud; (e) upsampling structured light point cloud; (f) point cloud after ICP registration; (g) original point cloud registration chromatic aberration map

Fig. 7. Comparison of two-dimensional profile cross-sections. (a) Original two-dimensional contour of microscopic data; (b) two-dimensional contour of microscopic data scale space; (c) two-dimensional contour of microscopic data scale slip; (d) original two-dimensional contour of structured light; (e) structured light up-sampling for 4 times two-dimensional contour; (f) two-dimensional contour after original data registration

Fig. 8. Scale slip results of film holes at positions 3, 4, 6 and 8

Fig. 9. Schematic of standard ceramic ball and its fitting sphere. (a) Standard ceramic ball; (b) fitting sphere with structured light measurement data

Fig. 10. Schematics of ceramic ball fitted under different upsampling ratios. (a) 2 times upsampling; (b) 4 times upsampling; (c) 8 times upsampling

Fig. 11. Aeroengine blade and its STL model. (a) Aeroengine blade; (b) STL model of blade

Fig. 12. Turbine blades and 4 times upsampled data. (a) Structured light measurements of turbine blades; (b) 4 times upsampling data of turbine blades

Fig. 13. Registration results of Ref. [7]. (a) Overall color difference diagram of gas film hole registration; (b) hole registration color difference diagrams of 3, (c) 4, (d) 6, and (e) 8 single gas film holes; (f) two-dimensional contour cut diagram after registration

Fig. 14. Registration results of Ref. [9]. (a) Overall color difference diagram of gas film hole registration; (b) registration color difference diagrams of 3, (c) 4, (d) 6, and (e) 8 single gas film holes; (f) two-dimensional contour cut diagram after registration

Fig. 15. Registration results of proposed method. (a) Overall color difference diagram of gas film hole registration; (b) hole registration color difference diagrams of 3, (c) 4, (d) 6, and (e) 8 single gas film holes; (f) two-dimensional contour cut diagram after registration