Recognise micrometer symbol in image

Question

Josep Llobet 2021-7-29

0
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https://ww2.mathworks.cn/matlabcentral/answers/888668-recognise-micrometer-symbol-in-image

评论： Josep Llobet 2021-8-3

I am trying to read a region of a image which contains the micrometer value.

image_sample = imread("https://i.ibb.co/GP2W6nn/mostra-josep.jpg");
imshow(image_sample)

Which binarized is like:

image_sample_BW = imread("https://i.ibb.co/HFJdYhz/mostra-josep2.jpg");
imshow(image_sample_BW)

I used ocr() function to identify the letters, but it does not result as I though:

results = ocr(image_sample_BW);
word = results.Words{1}

word = '100;4m'

Thank you

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Cris LaPierre 2021-8-2

Let me move my comment to an answer then.

Josep Llobet 2021-8-3

;) okey it's all right

then thinking, maybe taking the position of, in this case, the greek letter mu, I could obtain the other symbology by the other languajes which recognise numbers.

Thank you @Cris LaPierre

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Answer 1

Cris LaPierre 2021-8-2

1
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https://ww2.mathworks.cn/matlabcentral/answers/888668-recognise-micrometer-symbol-in-image#answer_759147

I have only played around with this quickly, but it is likely part of the issue is that you are using the english language package, but mu is a greek letter. Therefore, it is not even being considered as an option. By default, MATLAB comes with 2 language packages installed - English and Japanese.

Try installing the Computer Vision Toolbox OCR Language Data file. Easiest is probably to use the Add-ons explorer and search for the name I used.

This will add 60 or so additional languages, including greek. When I run your code using 'Language','greek', it does recognize the mu, but now everything else is wrong. Like I said, I've only just dabbled a little to see what is happening, but hopefully that at least gets you started in the right direction.