The above is a background subtracted, still-frame image of a magneto-optical
material viewed through a polarizing microscope. The dark and light domains
indicate the direction of the magnetic fields. The dark area
corresponds to a field pointing out of your screen and the light to a field
pointing inwards. After aquisition and background subtraction,
images undergo several stages of image processing including median filtering(3x3),
Gaussian filtering(7x7), thresholding, Sobel edge enhancement and finally
an outlining algorithm. The final image looks something like the
following:
The following image is the sum of the first image and
a
reverse-pixel valued version of the second image(for
easier viewing).
For a more detailed description the above
processes see John C. Russ's The Image Processing Handbook(1992).
