Text Enhancement with Asymmetric Filter for Video OCR

Stripes are common sub-structures of text characters, and the scale of these stripes varies little within a word. This scale consistency thus provides us with a useful feature for text detection and segmentation. In this paper a new form of filter is derived from the Gabor filter, and it is shown this filter can efficiently estimate the scales of these stripes. The contrast of text in video can then be increased by enhancing the edges of only those stripes found to correspond to a suitable scale. More specifically the algorithm presented here enhances the stripes in three pre-selected scale ranges. The resulting enhancement yields much better performance from the binarization process, which is the step required before character recognition.


Year:
2001
Publisher:
IDIAP
Keywords:
Note:
Published in Int. Conf. Image Analysis and Processing, Palermo Italy, Sep. 26-28, 2001, IEEE Computer Society.
Laboratories:




 Record created 2006-03-10, last modified 2018-01-27

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