One of several improvements made to the word spotter was to use faster descriptor based on a few elements of the Fourier transform of radial lines with logarithmic sampling. This makes the descriptor much faster, but still robust enough. Actually, it must not be too precise as the shape of the words varies in the text. The figure shows three sample points to the left with the radial logarithmic sampling scheme (in red). Next is the result of the sampling and to the right is the resulting feature vector.

The sampling is done using a Gaussian mask so that sampling “between” pixels can be performed.

  • Radial Line Fourier Descriptor for Handwritten Word Representation. Hast, A., Vats, E. Journal of WSCG, ISSN 1213-6972, vol 26, num 1. pp. 31-40. 2018.
    @article{Has18a, author = {A. Hast and E. Vats}, title = {Radial Line Fourier descriptor for historical handwritten text representation}, journal = {Journal of WSCG, ISSN 1213-6972}, pages = {31--40}, volume = {26}, number = {1}, year = {2018}}

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s