Size and alignment of a digit in an image for neural network training

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Soumyadip 2013-6-12

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Hi, I have been working on OCR using the Neural Network toolbox but I have a few fundamental doubts. Suppose I have the following images of digits:--

Since the digits are of different sizes, will it affect the neural network training and simulation? What are the parameters that a neural network uses to recognise images(like size, pixel values, shape, alignment, etc)? Please advise.

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Greg Heath 2013-6-12

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The input to the net from a single image is just a column vector of numbers of dimension I obtained by feature extraction. The feature extraction of an image of size r x c can be complicated or as simple as columnisation via

input = image(:);

size(input) = [ I 1 ] = [ r*c 1 ]

Hope this helps.

Thank you for formally accepting my answer

Greg