Short Description

This plugin computes a displacement map from a sequence of at least two consecutive images.

Documentation

This plugin analyses a pair of images and retrieves the displacement that transforms the first image into the second.

This is implemented as a 2D variational optical flow method. The problem formulation follows the energy-based Horn-Schunck method (B. Horn and N. Schunck, Determining Optical Flow, Artificial Intelligence, 17, 185-203, 1981). The discretization and the solving method differ from the original article in the following ways: the discretization is done with finite elements; the resulting linear system is solved with a Conjugate Gradient algorithm.

Note: there is a major limitation in the current implementation. There is no guarantee that it will detect properly movements larger than 1 pixel. This will be fixed in a future version, by doing a multiscale analysis.

 

2 reviews on “Optical Flow – Horn-Schunck

  1. Thank you for this plugin ! How can I export the displacement map ? (screenshot change the layer and save image as erase the map)

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Changelog

  • Version 1.0.0.6 • Released on: 2012-09-06 13:58:46
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    Description:

    Fix use of a method not yet in a released kernel.

  • Version 1.0.0.5 • Released on: 2012-09-06 13:47:07
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    Description:

    - Fix the logic of previous painters removal.
    - Apply color palettes to the displacement and norm sequences.

  • Version 1.0.0.4 • Released on: 2012-09-05 16:32:21
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    Description:

    - Now provides a block to use the Protocols visual interface.

    - Now you can choose to output the x/y displacements maps.

    - Fix some input parameters range.

  • Version 1.0.0.3 • Released on: 2012-07-16 15:12:39
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    Description:

    Display a clearer error message when the input sequence is not a time sequence.

  • Version 1.0.0.2 • Released on: 2012-06-11 16:34:15
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    Description:

    Restore the dependance on kernel >1.2.3.0

  • Version 1.0.0.1 • Released on: 2012-06-11 16:32:17
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    Description:

    -Adapt to changes in FlowDisplay plugin.

  • Version 1.0.0.0 • Released on: 2012-05-30 14:50:59
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    Description:

    Correct the version number, and request a minimum Icy kernel for Parallel Colt (1.2.3.0).

  • Version 0.0.1.0 • Released on: 2012-05-30 14:46:38
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