Text identification from Image

Hi , experts I'm currently working on the Digits identification from an image . when the user uploading an image Eg- Digital meter  all the words and letters present in the digital meter box converted as text . But in my case i want only the numbers to be converted as text . So i imported the crop functionality and able to edit the image as per our request . But while Performing the edit functionality in phone the app was too slow because of the crop feature . So is there any alternate method to improve the app functionality. Every time when the user try to upload the image of digital meter all the text in digital meter will be visible . So each time the user has to crop the image and submit . It will be very complex for user . As the app not user friendly. If any alternate ideas are there .Please text below Thank you
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