TODAI

(Typographic Ornament Database And Identification)

Developer

Electrical Engineering Department, EPFL, Switzerland, and later the Intelligent Systems Laboratory, Halmstad University, Sweden.

URL

http://www.unil.ch/BCU/docs/collecti/res_prec/en/wtres/todai_doc.html.

References

[MKBC96]

Features

The image is first decomposed into six orientation images. Each orientation image is result of applying a filter that passes edges with a specified orientation. Thus, an orientation image contains information about the presence in the original image of linear structure in the direction of the pass orientation. The projection of the orientation image in the direction of the pass orientation is called an orientation radiogram. Six fixed directions are chosen to make radiograms. Each radiogram is represented by a feature vector of the real parts and the absolute values of the imaginary parts of the first ten Fourier coefficients. The absolute value operation provides invariance to flipping of the image.

Querying

The user can specify the location of a query image. Additional criteria such as the size, use and nature of the ornament can be indicated, see figure 27. There is a possibility to make an advanced search combining keywords and the image content.

Matching

The similarity between two images is the sum of the Euclidean distances of the six feature vectors.

Result presentation

The best match is shown, the user can browse through the list of next matches.

Applications

The system is used in Passe-Partout, the International Bank of Printers' Ornaments (http://www.unil.ch/BCU/docs/collecti/res_prec/fr/todai_intro.html), which stores 2316 images.

  

Figure 27: TODAI: query specification.