Directional filtering in edge detection

— Two-dimensional (2-D) edge detection can be performed by applying a suitably selected optimal edge half-filter in n directions. Computationally, such a two-dimensional n-directional filter can be represented by a pair of real masks, that is, by one complex-number matrix, regardless of the number of filtering directions, n: Specific calculations of the edge strength were conducted using a 2-D tridirectional filter based on a Petrou–Kittler one-dimensional (1-D) detector optimized for the ramp edges, which are characteristic of posterior eye capsule images that were used here as a test set. In applications to image segmentation, tridirectional filtering results in co-occurrence arrays of low dimensionality.

• Type: Journal
• Year: 1998
• Where: TIP
• Authors: Andrew P. Paplinski
• Keywords: 2-D Tridirectional filter, Edge, TIP 1998, Two-dimensional N-directional filter