mpi/fruitfly/registration/Feature.java

   1 package mpi.fruitfly.registration;
   2
   3 import java.io.Serializable;
   4
   5 /**
   6  * SIFT feature container
   7  */
   8 public class Feature implements Comparable< Feature >, Serializable
   9 {
  10         public float scale;
  11         public float orientation;
  12         public float[] location;
  13         public float[] descriptor;
  14
  15         /** Dummy constructor for Serialization to work properly. */
  16         public Feature() {}
  17
  18         public Feature( float s, float o, float[] l, float[] d )
  19         {
  20                 scale = s;
  21                 orientation = o;
  22                 location = l;
  23                 descriptor = d;
  24         }
  25
  26         /**
  27          * comparator for making Features sortable
  28          * please note, that the comparator returns -1 for
  29          * this.scale &gt; o.scale, to sort the features in a descending order
  30          */
  31         public int compareTo( Feature f )
  32         {
  33                 return scale < f.scale ? 1 : scale == f.scale ? 0 : -1;
  34         }
  35
  36         public float descriptorDistance( Feature f )
  37         {
  38                 float d = 0;
  39                 for ( int i = 0; i < descriptor.length; ++i )
  40                 {
  41                         float a = descriptor[ i ] - f.descriptor[ i ];
  42                         d += a * a;
  43                 }
  44                 return ( float )Math.sqrt( d );
  45         }
  46 }
  47