How do I threshold this Image correctly?

asked 2015-01-30 06:40:57 -0500

Hello. I'm trying to threshold this image to get the characters more visible. I've used OTSU threshold but I don't get good results because when I convert the image to gray it is difficult to find a good threshold value. Would you please give me some ideas? Can I threshold an image on another colorspace ? thank you and sorry for my english.

Licence Plate

Gray Licence Plate


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You should treshold in the RGB or HSV color space if all your input images are that blue!

StevenPuttemans gravatar imageStevenPuttemans ( 2015-01-30 07:48:17 -0500 )edit

Try adaptive thresholding

Dionysos gravatar imageDionysos ( 2015-01-30 09:36:42 -0500 )edit