Dividing up a word into letters based on the coordinates already present?

I was able to detect the letters in an Arabic word and record/save its coordinates. The word or image in question is:

The points are represented by red and yellow markers (Which were plotted using the plot command)

I got these markers by first converting the image to logical, complementing it, skeletonizing it, then using a modified chain code algorithm to detect the letters.

The red markers are:

110  287
123  325
115  150
109  185
120  219

The yellow markers are:

103  267
99  142
105  109
37  186

Having these coordinates I would like to isolate the letters as separate images or matrices. that is split up or extract the letters and save them individually for further processing.

I thought having the coordinates would make a simple procedure of just cropping out the original image but apparently that is not working. I have tried

test = img(:,109,:,120)
test = im(185:109,219:120);

And these are not working.

How would I go about splitting this up?

Thank you

Answer 1

[Adam]

The first of your options would only work on a 4d matrix.

The second would work if you swap round your indices - you have to have min:max:

test = im( 109:185, 120:219 ).

Assuming im is a matrix of size at least 185 * 219 that will cut out the rectangle you describe there, though not the individual letters distinct from each other.