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A Simple Algorithm for Zerocrossings

This is a simple algorithm. It uses a fixed flitersize for Laplacian of a Gaussian, and zooms to adjust the filtersize. So the original input-image

 - Original image -

Fig: Original Image

is zoomed down, and filtered with a fixed Laplacian of Gaussian:

 - filtered version -

Fig: filtered version

After zooming up again

 - Lowpass-filtered image  -

Fig: Low-passfiltered image

the image is simply searched for zerocrossings:

 - Output  -

Fig: Output

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