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License Plate Exercise

Published: Friday, 27 December 2013
Rear Image of a Car with License Plate

Goal: Extract the license numbers from the image.

Approach: Use the square grid. Several solutions. For extracting the region of the plate use the clohole working on the white sets

Keywords: opening by adjunction, opening by reconstruction, anisotropy, residual, top hat


1. Tresholded Image


2. TopHat to Retain Details Including the Letters


3. Fill the Holes to Extract Letters


4. Difference Image


5. Geodesically dilated image after opening the initial image to remove some remaining grains/noise.

Comment: The approach was based on the nested succession of dark(outside)-white(plate)-dark(letters inside the plate). Note that we were not disturbed by the white stripe – the white vertical illumination stripe.

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