Rotationally Symmetric Operators for Surface Interpolation
The use of rotationally symmetric operators in vision is reviewed and conditions for rotational symmetry are derived for linear and quadratic forms in the first and second partial directional derivatives of a function f(x,y). Surface interpolation is considered to be the process of computing t...
| Egile Nagusiak: | , |
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| Hizkuntza: | en_US |
| Argitaratua: |
2004
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| Sarrera elektronikoa: | http://hdl.handle.net/1721.1/6365 |
| _version_ | 1826210324821311488 |
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| author | Brady, Michael Horn, Berthold K.P. |
| author_facet | Brady, Michael Horn, Berthold K.P. |
| author_sort | Brady, Michael |
| collection | MIT |
| description | The use of rotationally symmetric operators in vision is reviewed and conditions for rotational symmetry are derived for linear and quadratic forms in the first and second partial directional derivatives of a function f(x,y). Surface interpolation is considered to be the process of computing the most conservative solution consistent with boundary conditions. The "most conservative" solution is modeled using the calculus of variations to find the minimum function that satisfies a given performance index. To guarantee the existence of a minimum function, Grimson has recently suggested that the performance index should be a semi-norm. It is shown that all quadratic forms in the second partial derivatives of the surface satisfy this criterion. The seminorms that are, in addition, rotationally symmetric form a vector space whose basis is the square Laplacian and the quadratic variation. Whereas both seminorms give rise to the same Euler condition in the interior, the quadratic variation offers the tighter constraint at the boundary and is to be preferred for surface interpolation. |
| first_indexed | 2024-09-23T14:47:43Z |
| id | mit-1721.1/6365 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T14:47:43Z |
| publishDate | 2004 |
| record_format | dspace |
| spelling | mit-1721.1/63652019-04-12T08:30:23Z Rotationally Symmetric Operators for Surface Interpolation Brady, Michael Horn, Berthold K.P. The use of rotationally symmetric operators in vision is reviewed and conditions for rotational symmetry are derived for linear and quadratic forms in the first and second partial directional derivatives of a function f(x,y). Surface interpolation is considered to be the process of computing the most conservative solution consistent with boundary conditions. The "most conservative" solution is modeled using the calculus of variations to find the minimum function that satisfies a given performance index. To guarantee the existence of a minimum function, Grimson has recently suggested that the performance index should be a semi-norm. It is shown that all quadratic forms in the second partial derivatives of the surface satisfy this criterion. The seminorms that are, in addition, rotationally symmetric form a vector space whose basis is the square Laplacian and the quadratic variation. Whereas both seminorms give rise to the same Euler condition in the interior, the quadratic variation offers the tighter constraint at the boundary and is to be preferred for surface interpolation. 2004-10-04T14:53:23Z 2004-10-04T14:53:23Z 1981-11-01 AIM-654 http://hdl.handle.net/1721.1/6365 en_US AIM-654 9497089 bytes 6792407 bytes application/postscript application/pdf application/postscript application/pdf |
| spellingShingle | Brady, Michael Horn, Berthold K.P. Rotationally Symmetric Operators for Surface Interpolation |
| title | Rotationally Symmetric Operators for Surface Interpolation |
| title_full | Rotationally Symmetric Operators for Surface Interpolation |
| title_fullStr | Rotationally Symmetric Operators for Surface Interpolation |
| title_full_unstemmed | Rotationally Symmetric Operators for Surface Interpolation |
| title_short | Rotationally Symmetric Operators for Surface Interpolation |
| title_sort | rotationally symmetric operators for surface interpolation |
| url | http://hdl.handle.net/1721.1/6365 |
| work_keys_str_mv | AT bradymichael rotationallysymmetricoperatorsforsurfaceinterpolation AT hornbertholdkp rotationallysymmetricoperatorsforsurfaceinterpolation |