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A Gimp Plugin that uses “GrabCut” to perform image segmentation

A Gimp Plugin that uses “GrabCut” to perform image segmentation. Project Proposal and Overview By: Matthew Marsh. What is Image Segmentation?. Divides an image into parts Easy for humans Non Trivial for Computers. 3 Types of Segmentation Thresholding Edge Based Region Based.

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A Gimp Plugin that uses “GrabCut” to perform image segmentation

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  1. A Gimp Plugin that uses “GrabCut” to perform image segmentation Project Proposal and Overview By: Matthew Marsh

  2. What is Image Segmentation? • Divides an image into parts • Easy for humans • Non Trivial for Computers • 3 Types of Segmentation • Thresholding • Edge Based • Region Based

  3. An Alpha Matte • All Segmentation Techniques Create an alpha matte • This is just a labeling of pixels • Some methods allow an alpha value between 0 and 1 Alpha Matte Created After Segmentation Origional Image

  4. Previous Approaches to Segmentation • Magic Wand • User specifies point • Segmentation based on variable tolerance level of color statistics. • Intelligent Scissors • User Draws minimum cost contour • Various seed points • Not effective for highly textured areas e.g long strands of hair

  5. “GrabCut” • Innovative – uses region and edge information • Also performs border matting • Based upon graph cut

  6. Graph cut • For greyscale images • Cost function which depends on Edge and Region Information • Minimize cost function to obtain best cut • Cost function in minimized by a Max Flow Algorithm

  7. How Graph Cut Works • To perform segmentation the user provides ‘seeds’ • Pixels labeled as definitely background or foreground (Hard constraints) • Cost function defined by boundary and rejoin properties (Soft constraints) • Cutting along the path of least cost produces best segmentation

  8. Graph cut

  9. How “GrabCut” extends graph cut • Uses GMMs to work with colour images • Alows an iterative approach to segmentation • Adds Border Matting

  10. “GrabCuts” Interactive Approach to Segmentation Initial Selection Refinement Final Segmentation

  11. My Project • A Gimp Plugin Using “GrabCut” • Initial Simplifications: • Use Graph cut approach • No Max flow algorithm • Later Add: • Max flow algorithm • Color functionality using GMMS • Border matting

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