text: #import "GPUImageFilterGroup.h"
  
  @class GPUImageGaussianBlurFilter;
  @class GPUImageToonFilter;
  
  /** This uses a similar process as the GPUImageToonFilter, only it precedes the toon effect with a Gaussian blur to smooth out noise.
   */
  @interface GPUImageSmoothToonFilter : GPUImageFilterGroup
  {
      GPUImageGaussianBlurFilter *blurFilter;
      GPUImageToonFilter *toonFilter;
  }
  
  /// The image width and height factors tweak the appearance of the edges. By default, they match the filter size in pixels
  @property(readwrite, nonatomic) CGFloat texelWidth; 
  /// The image width and height factors tweak the appearance of the edges. By default, they match the filter size in pixels
  @property(readwrite, nonatomic) CGFloat texelHeight; 
  
  /// A multiplier for the blur size, ranging from 0.0 on up, with a default of 0.5
  @property (readwrite, nonatomic) CGFloat blurSize;
  
  /// The threshold at which to apply the edges, default of 0.2
  @property(readwrite, nonatomic) CGFloat threshold; 
  
  /// The levels of quantization for the posterization of colors within the scene, with a default of 10.0
  @property(readwrite, nonatomic) CGFloat quantizationLevels; 
  
  @end
  