features of a binary image, ocr

2014 11 4
2 个回答
更新时间：2014 11 6
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So I have segmented an image consisting of letters, it's a binary image. I have used regionprops and bwconncomp, standard Matlab functions. So now I want to extract features on the region of pixels that are equal to one, into a feature vector. It is also good if the features does not depend on which position the region has, so if the regions is shifted in x or y direction then the same features will be obtained. Is there any Matlab function that can do that? Thank!

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Image Analyst
Image Analyst 2014-11-4

2 个投票

Yes. regionprops().

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Adam
Adam 2014-11-5
Sir, can you give me some examples on how to use regionprops()? I have looked at it but I can't figure out what I should do with it, do you have any concrete ideas?
Image Analyst
Image Analyst 2014-11-5
A well commented tutorial is in my File Exchange: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862 Look for Image Segmentation Tutorial.
Adam
Adam 2014-11-6
Thanks! But do you have features that you can recommend in the case of getting a good hit-rate, i.e. the percentage of characters that are correctly found and classified? I have a benchmark program that can calculate the hit-rate which is nice if you want to know that your ocr-system is good or not. I don't really see how blobs can be convenient in an ocr-system, or maybe I'm wrong. I haven't tried it out yet.
Image Analyst
Image Analyst 2014-11-6
It's just a general purpose generic routine. It's not specially adapted for OCR. See http://www.mathworks.com/help/vision/ref/ocr.html#bt548t1-2_1

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Dima Lisin
Dima Lisin 2014-11-6

1 个投票

There is a built-in ocr function in the Computer Vision System Toolbox.

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Adam
2014-11-4

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Image Analyst
Image Analyst
2014-11-6

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