Crop an image per letter

hello, we are working on the project of automated handwriting analysis. At present we have achieved a line and word segmentation. I want to crop the individual letters of a cursive handwriting. Please guide me.

[Walter Roberson]

Replaced by http://uk.mathworks.com/matlabcentral/answers/260193-crop-the-given-image-into-individual-letters which has a couple of comments on it.