Plan of the presentation Content based image retrieval

Plan of the presentation

Content based image retrieval

Similarity measures

Indexing using Text

Video properties

Text extraction: general scheme

Detection in single frames

Detection in single frames: examples

A filter for text detection

Mathematical morphology

Detection in video sequences

Integration of the rectangles  occurrences

Suppression of false alarms: Examples

Image enhancement

Interpolation: Examples

Interpolation: thresholded examples

Binarisation

Binarisation methods

Binarisation by Niblack

Binarisation by Niblack: Problems

Binarisation: Improvement by Sauvola

Binarisation by Sauvola, examples

Improvement: Adaptive dynamic range

Improvement: Shift of the image range

Improvement: Shift of the image range

Fast incremental calculation

The experiments

Test videos

Video example - France Télécom

The interface to the OCR software

OCR Page - Manual

OCR Output

Post processing of OCR output

Automatic evaluation using markers

OCR Evaluation

OCR Evaluation: Wagner & Fischer

Detection results - INA Videos

Binarisation methods: Examples

Binarisation methods: Examples

OCR Results - Classification by binarisation method

OCR Results: Interpolation methods

Conclusion

Outlook