Blob detection on images using Matlab

Outline:

1. Generate a Laplacian of Gaussian filter.

2. Build a Laplacian scale space, starting with some initial scale and going for n iterations:

   • Filter image with scale-normalized Laplacian at current scale.
   • Save square of Laplacian response for current level of scale space.
   • Increase scale by a factor k.

3. Perform nonmaximum suppression in scale space.

4. Display resulting circles at their characteristic scales.

Two implementations performed for performance comparison:

• Upscaling filter size
• Downsampling image