Edge Feature Extraction

Brief Description

This application computes edge features on every pixel of the input image selected channel

Tags

Feature Extraction, Edge

Long Description

This application computes edge features on a selected channel of the input.It uses different filter such as gradient, Sobel and Touzi

Parameters

• Input Image (in): The input image on which the features are computed.

• Selected Channel (channel): The selected channel index

• Available RAM (Mb) (ram): Available memory for processing (in MB)

• Edge feature (filter): Choice of edge feature

  • Gradient (gradient): This filter computes the gradient magnitude of the image at each pixel.

  • Sobel (sobel): This filter uses the Sobel operator to calculate the image gradient and then finds the magnitude of this gradient vector.

  • Touzi (touzi): This filter is more suited for radar images. It has a spatial parameter to avoid speckle noise perturbations. The larger the radius is, less sensible to the speckle noise the filter is, but micro edge will be missed.

    • The X radius of the neighborhood. (filter.touzi.xradius):

    • The Y radius of the neighborhood. (filter.touzi.yradius):




• Feature Output Image (out): Output image containing the edge features.

• Load otb application from xml file (inxml): Load otb application from xml file

• Save otb application to xml file (outxml): Save otb application to xml file

Limitations

None

Authors

OTB-Team

See also

otb class

Example of use

• Values for GUIs:

• in: qb_RoadExtract.tif

• channel: 1

• out: Edges.tif

• Command line to execute:

otbcli_EdgeExtraction -in qb_RoadExtract.tif -channel 1 -out Edges.tif