text: #import "GPUImageFilterGroup.h"
  
  // This generates image-wide feature descriptors using the ColourFAST process, as developed and described in
  //
  // A. Ensor and S. Hall. ColourFAST: GPU-based feature point detection and tracking on mobile devices. 28th International Conference of Image and Vision Computing, New Zealand, 2013, p. 124-129.
  //
  // Seth Hall, "GPU accelerated feature algorithms for mobile devices", PhD thesis, School of Computing and Mathematical Sciences, Auckland University of Technology 2014.
  // http://aut.researchgateway.ac.nz/handle/10292/7991
  
  @class GPUImageColourFASTSamplingOperation;
  @class GPUImageBoxBlurFilter;
  
  @interface GPUImageColourFASTFeatureDetector : GPUImageFilterGroup
  {
      GPUImageBoxBlurFilter *blurFilter;
      GPUImageColourFASTSamplingOperation *colourFASTSamplingOperation;
  }
  // The blur radius of the underlying box blur. The default is 3.0.
  @property (readwrite, nonatomic) CGFloat blurRadiusInPixels;
  
  @end
  