How can I extract number/letter part from this binary image ?

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I tried erosion/dilation process but I failed :/
  2 Comments
Jahidul Islam Munna
Jahidul Islam Munna on 14 Aug 2017
Thanks for your comment.
No, I don't need to extract it as a string, I only need to show the letters/numbers portion of this binary image.
And I don't have any Neural Network or Machine Learning Knowledge. I wanted to do this using only image processing technique. I've applied erosion/dilation process but It didn't work well :/

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Answers (2)

Gareth Thomas
Gareth Thomas on 14 Aug 2017
Have you tried OCR? Optical Character Recognition.
This comes with the Computer Vision System Toolbox.
  1 Comment
Jahidul Islam Munna
Jahidul Islam Munna on 14 Aug 2017
Thanks for your valuable comment.
But I don't need to recognize the characters. All I want to remove all objects/components except letter/number portion of this binary image.

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mizuki
mizuki on 15 Aug 2017
This example would help - this is part of OCR example, but what it does first (- Step 4) is extracting the area of letters by removing other areas.

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