Plan Image/video indexing

Plan

Image/video indexing

Text detection

Detection in an image

Plan

Videos vs. scanned documents

Videos vs. scanned documents

What is text? - character segmentation

What is text? - texture

What is text? - texture

What is text? - corners

What is text? - contrast & geometry

What is text? - color

Plan

Evaluation

Evaluation at different levels

Evaluation on rectangle level

Evaluation on rectangle level

Performance graphs

Performance graphs

Comparison of different detection algorithms

The influence of the test database

Plan

The local contrast method

The learning method

Geometrical features: baseline

Estimation of the text rectangle height

Features

Learning with Support Vector Machines

Plan

Detection in still images

Detection in video sequences

Character segmentation: examples

OCR results

TREC 2002

Conclusion

Outlook

Optional slides

The Bhattacharyya distance