Name
Abstract | ||
|---|---|---|
Level set methods have been widely used in image processing and computer vision. In conventional level set formulations, the level set function typically develops irregularities during its evolution, which may cause numerical errors and eventually destroy the stability of the evolution. Therefore, a numerical remedy, called reinitialization, is typically applied to periodically replace the degraded level set function with a signed distance function. However, the practice of reinitialization not only raises serious problems as when and how it should be performed, but also affects numerical accuracy in an undesirable way. This paper proposes a new variational level set formulation in which the regularity of the level set function is intrinsically maintained during the level set evolution. The level set evolution is derived as the gradient flow that minimizes an energy functional with a distance regularization term and an external energy that drives the motion of the zero level set toward desired locations. The distance regularization term is defined with a potential function such that the derived level set evolution has a unique forward-and-backward (FAB) diffusion effect, which is able to maintain a desired shape of the level set function, particularly a signed distance profile near the zero level set. This yields a new type of level set evolution called distance regularized level set evolution (DRLSE). The distance regularization effect eliminates the need for reinitialization and thereby avoids its induced numerical errors. In contrast to complicated implementations of conventional level set formulations, a simpler and more efficient finite difference scheme can be used to implement the DRLSE formulation. DRLSE also allows the use of more general and efficient initialization of the level set function. In its numerical implementation, relatively large time steps can be used in the finite difference scheme to reduce the number of iterations, while ensuring sufficient numerical accuracy. To demonstrate the effectiveness of the DRLSE formulation, we apply it to an edge-based active contour model for image segmentation, and provide a simple narrowband implementation to greatly reduce computational cost. |
Year | DOI | Venue |
|---|---|---|
2010 | 10.1109/TIP.2010.2069690 | IEEE Transactions on Image Processing |
Keywords | Field | DocType |
zero level,level set evolution,regularized level set evolution,zero level set,conventional level set formulation,image segmentation,distance regularization term,level set function,degraded level set function,new variational level set,distance regularized level set,level set method,gradient flow,signed distance function,mathematical model,set theory,iterative method,computer vision,computational complexity,distance function,finite difference method,localization,precision,active contour model,active contour,implementation,edge detection,image processing,level set,accuracy,computational modeling | Active contour model,Set theory,Computer vision,Mathematical optimization,Level set method,Edge detection,Signed distance function,Level set,Image segmentation,Artificial intelligence,Initialization,Mathematics | Journal |
Volume | Issue | ISSN |
19 | 12 | 1941-0042 |
Citations | PageRank | References |
488 | 14.89 | 17 |
Authors | ||
4 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Chunming Li | 1 | 2683 | 98.49 |
| Chenyang Xu | 2 | 585 | 23.07 |
| Changfeng Gui | 3 | 1008 | 37.18 |
| Martin D. Fox | 4 | 1122 | 44.46 |