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

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Jahidul Islam Munna
回答： mizuki 2017-8-15
I tried erosion/dilation process but I failed :/
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Baptiste Ottino
Baptiste Ottino 2017-8-14
编辑：Baptiste Ottino 2017-8-14
Do you want to extract it as a string? It is a difficult task, and you want to take a look at the Tools in the following toolboxes:
  1. Statistics and Machine Learning Toolbox
  2. Neural Network Toolbox
I doubt someone will post exactly how to do it, because it is a small project in itself. Have fun!
Jahidul Islam Munna
Jahidul Islam Munna 2017-8-14
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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回答（2 个）

Gareth Thomas
Gareth Thomas 2017-8-14
Have you tried OCR? Optical Character Recognition.
Recognize Text Using Optical Character Recognition (OCR)
This comes with the Computer Vision System Toolbox.
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Jahidul Islam Munna
Jahidul Islam Munna 2017-8-14
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 2017-8-15
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.
- Automatically Detect and Recognize Text in Natural Images http://www.mathworks.com/help/vision/examples/automatically-detect-and-recognize-text-in-natural-images.html?lang=en

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