https://github.com/motemen/as3-klt

Kanade-Lucas-Tomasi feature tracker implementation in as3
https://github.com/motemen/as3-klt

Last synced: 25 days ago
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Kanade-Lucas-Tomasi feature tracker implementation in as3

• Host: GitHub
• URL: https://github.com/motemen/as3-klt
• Owner: motemen
• Created: 2008-09-25T05:06:29.000Z (about 16 years ago)
• Default Branch: master
• Last Pushed: 2008-09-25T06:35:58.000Z (about 16 years ago)
• Last Synced: 2024-08-03T05:02:11.606Z (3 months ago)
• Language: ActionScript
• Homepage:
• Size: 449 KB
• Stars: 11
• Watchers: 6
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.rst

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• awesome-actionscript-sorted - as3-klt - Kanade-Lucas-Tomasi feature tracker implementation in as3 (Multimedia / Image)

README

        
===============

    as3-klt

===============

as3-klt is a library for image feature detection/tracking based on `KLT `_, a C library.

------------

  Synopsis

------------

::

  // detect

  var bd:BitmapData = new BitmapData(image.width, image.height);

  bd.draw(image);

  var g:Graphics = canvas.graphics;

  g.beginBitmapFill(bd);

  g.drawRect(0, 0, bd.width, bd.height);

  g.endFill();

  g.lineStyle(1, 0xFF0000);

  var tracker:KLTTracker = new KLTTracker;

  var features:Array = tracker.selectGoodFeatures(bd, image.width, image.height, 20);

  for each (var p:KLTFeature in features) {

      g.drawCircle(p.x, p.y, 2);

  }

  // track

  var bd2:BitmapData = new BitmapData(image.width, image.height);

  bd2.draw(image2);

  var newFeatures:Array = tracker.trackFeatures(bd1, bd2, image.width, image.height, features);

  var g2:Graphics = canvas2.graphics;

  g2.beginBitmapFill(bd2);

  g2.drawRect(0, 0, bd2.width, bd2.height);

  g2.endFill();

  g2.lineStyle(1, 0xFF0000);

  for each (var p:KLTFeature in newFeatures) {

      g2.drawCircle(p.x, p.y, 2);

  }

-----------

  Classes

-----------

``net.tokyoenvious.KLT.KLTTracker``

'''''''''''''''''''''''''''''''''''

Contains feature-tracking context.

``selectGoodFeatures(bd:BitmapData, nCols:uint, nRows:uint, nFeatures:int):Array``

  Finds and returns ``nFeatures`` feature points in an image ``bd`` of size ``nCols`` x ``nRows``.

``trackFeatures(bd1:BitmapData, bd2:BitmapData, nCols:uint, nRows:uint, features:Array):Array``

  Tracks ``features`` in image ``bd1`` of size ``nCols`` x ``nRows`` and returns their new positions in ``bd2``.

``net.tokyoenvious.KLT.KLTFeature``

'''''''''''''''''''''''''''''''''''

Represents a detected feature point.

``x``, ``y``

  Feature's position.

``val``

  (selectGoodFeatures) Feature's score.

  (trackFeatures) Feature's status.

``net.tokyoenvious.KLT.KLTFloatImage``

''''''''''''''''''''''''''''''''''''''

Used internally. Has value of type ``Number`` on each pixel.

``net.tokyoenvious.KLT.KLTPyramid``

'''''''''''''''''''''''''''''''''''

Used internally. Represents pyramid of ``KLTFloatImage``.

--------

  TODO

--------

* Implement sequential mode

* Improve speed

* Accept tracking region as ``Rectangle``

* Simplify code