Reading seven segment display with OCR command
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Kevin Ammann
on 3 Jul 2019
Commented: Brett Shoelson
on 3 Mar 2021
I am trying to read the digits off of Images of a seven segment display, like the one below.
b = imread('frame1.jpg'); %image above
imshow(b)
BW1 = imbinarize(rgb2gray(b),0.2);
BW2 = imcomplement(BW1);
figure; imshow(BW2); roi = round(getPosition(imrect));
imshowpair(BW1,BW2,'montage')
ocrResults = ocr(BW2,roi,'CharacterSet','.0123456789','TextLayout','word');
recognizedText = ocrResults.Text;
text(600, 150, recognizedText, 'BackgroundColor', [1 1 1]);
However the ocr command cannot read the digits correclty, as can be seen in the textbox on the processed image below.
Are there any pre-processing steps I should additionaly take?
Do I need to use the ocr command in a different way?
Thanks in advance for any suggestions
1 Comment
Brett Shoelson
on 3 Mar 2021
Attempts to do this using image morphology are almost certain to fail under certain conditions. Better: download and install a (freely available) 7-segment font, then use the OCR Trainer App to train the character recognition on samples of those digits. You'll get better results!
Brett
Accepted Answer
KALYAN ACHARJYA
on 3 Jul 2019
Edited: KALYAN ACHARJYA
on 3 Jul 2019
One Suggestion: connect the disconneted pixels, then apply the OCR
Let me know the result, is it working?
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