title: Opencv MPEG7 descriptors
body: <p>I am working on the system that compares images. MPEG-7 standard provides some descriptors which can be used for that e.g: Dominant Color, Color Layout, Edge Histogramm, Color Coherence Vectors.
  Do you know where i can get a source code for some of these methods?</p>
  
  <p>Thx!</p>