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How do I make the characters standout on the following

Hello,

I'm trying to read the numbers below from a GAS meter in google AI but the numbers are not clear enough for it to pick them up. How can I make the numbers stand out more in openCV so google AI will then read the numbers? Or is there a better alternative to what i'm currently doing? Your help is much appreciated.

I'm only interested in "1455121" in the image, the actual meter.

image description