Number of input and output field

Number of input field	:	Two
Number of output field	:	One

This transformation function is used to create image of key point association from two images. The output is an image that shows the key point association.
This transformation function uses 'key point descriptor method' to describe image feature.

The key point descriptor methods are :

• SIFT
  (Scale Invariant Feature Transform) face-image descriptor.
• SURF
  (Speeded-Up Robust Features) face-image descriptor.
• BRIEF
  (Robust Independent Elementary Features) image descriptor
• ROOTSIFT
  (Normalized Scale Invariant Feature Transform) face-image descriptor..