|  Original: a begonia |  Original: a dahlia | 
|  Expanded Gaussian pyramid at level 2 |  Expanded Gaussian pyramid at level 2 | 
|  Expanded Laplacian pyramid at level 2 |  Expanded Laplacian pyramid at level 2 | 
|  Expanded zero crossings of Laplacian pyramid at level 2 |  Expanded zero crossings of Laplacian pyramid at level 2 | 
|  Merging at level 0 |  Merging at level 2 | 
|  Merging at level 4 |  Merging at level 6 |