An outdoor scene image.
Boundaries of interest delineated by the RaG curve-fitting tool.
The interactively created curves can be saved as a binary image or overlaid with the original
image as shown above.
To obtain a license for this curve fitting software, please follow the link =>
Rational Gaussian curve fitting
Image Registration and Fusion Systems  
This software implements the Rational Gaussian (RaG) curve model. The user creates a shape by providing
approximate points on a shape in an image and interactively revising the positions of the points while viewing
the curve. Some of the properties of this curve are:
  • It has a smoothness parameter that can be varied to produce more details in a created shape or to
    remove some of the smaller details and generate a smoother shape.
  • The curve is defined globally but because its blending functions approach zero exponentially, the curve
    behaves like a local curve.
  • All derivatives of the curve are continuous.
  • It can reproduce circles exactly. To create a circle, select three points on the circle.

This software may be used to manually segment an image. The user delineates the boundaries of  objects in
an image by selecting points on the boundaries and revising the positions of the points as needed. An
example is given below.