This video shows how one can use OCR from Computer Vision toolbox of Matlab to easily read numbers or digits from an image.
It further shows how we can superimpose a rectangle over the boundaries of the text part identified by the OCR in the image.
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Complete source code and other details:
I = imread('number.png');
ocrOutput = ocr(I, 'TextLayout', 'Line', 'characterSet', '0123456789');
outputNum = str2double(ocrOutput.Text)
ocrImage = insertObjectAnnotation(I, 'rectangle', ocrOutput.WordBoundingBoxes, ...
ocrOutput.WordConfidences);
imshow(ocrImage);


The images used in demo are posted below:

