I have a number of webcam images of road signage,

tesseract-ocr output is highly variable, how to optimise?

for example
http://peepo.com/pics/ocr/road_signs.jpg
outputs

West End

Barbican

Exhibition -9
Halls

and 
http://peepo.com/pics/ocr/when_red.png
'when red light shows stop here'
outputs

' LIGHT SHOWS
wmr HERE

How can I ensure more text is extracted in the general case?


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