#include <otbSFSTexturesFunctor.h>

Detailed Description

This functor computes textures based on line direction analysis through the central pixel.

Directions are computed using NumberOfDirection, used to compute a constant step angle. A direction is defined as : $\mathit{d_{i} = \sqrt{(m^{e1}-m{e2})^{2}+(n^{e1}-n{e2})^{2}}}$ From $\mathit{d_{i}}$ , histograms are defined : $\mathit{H(c) : \{c \in I \mid \lbrack d_{1}(c), \ldots , d_{i}(c), \ldots , d_{D}(c)\rbrack \}}$ Thus, 6 textures are defined : $\mathit{length = \max_{i \in \lbrack1; D\rbrack}(d_{i}(c)}$ $\mathit{width = \min_{i \in \lbrack1; D\rbrack}(d_{i}(c)}$ $\mathit{PSI = \frac{1}{D}\sum_{1=1}^{D}d_{i}(c)}$ $\mathit{\omega-mean = \frac{1}{D}\sum_{1=1}^{D}\frac{\alpha.(k_{i}-1)}{st_{i}}d_{i}(c)}$ $\mathit{ratio = \arctan{\frac{\sum_{j=1}^{n}{sort_{min}^{j}(H(c))}}{\sum_{j=1}^{n}{sort_{max}^{j}(H(c))}}}}$ $\mathit{SD = \frac{1}{D-1}\sqrt{\sum_{1=1}^{D}(d_{i}(c)-PSI)^{2}}}$

For more details, please refer to refer to Xin Huang, Liangpei Zhang and Pingxiang Li publication, Classification and Extraction of Spatial Features in Urban Areas Using High-Resolution Multispectral Imagery. IEEE Geoscience and Remote Sensing Letters, vol. 4, n. 2, 2007, pp 260-264

The documentation for this class was generated from the following file:

otbSFSTexturesFunctor.h