Hi Abhishek,
hope you are doing well.
What you need to do is to pre-process the image. Conver it to binary file 
or invert the colors to black and white. then what you can do is use opencv 
to draw a contour on the number. then that contour can be cut out and sent 
to tesseract. 
I can provide you the contour detection coe if you want. Revert back for 
any query. 
Keep up the good work. 

On Wednesday, February 14, 2018 at 3:45:01 PM UTC+5:30, abhishek gupta 
> I want to read this digit in this image but tesseract shows it as empty 
> page.I tried as
> tesseract i.png stdout digits

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