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

I tried erosion/dilation process but I failed :/

[Baptiste Ottino]

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]

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 :/

Answer 1

[Gareth Thomas]

Have you tried OCR? Optical Character Recognition.

Recognize Text Using Optical Character Recognition (OCR)

This comes with the Computer Vision System Toolbox.

[Jahidul Islam Munna]

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.

Answer 2

[mizuki]

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