Comparing images using morphological operations only

I have to detect numbers on license plate through comparing them with the digits numbers images, only using morphology, but i get stuck after segmenting the digits and while comparing both images "9 from plate & 9 original image" ANDing gives me partially wrong answer

% max = -99999;
% bothTrue = IMG & One;
% NumPixels = sum(bothTrue(:));
% if NumPixels>max
%     max=NumPixels;
%     Digit=1;
% end

and getting the near "Extent area" fails also

min=100000;
A=sqrt((0.4913)^2-Anum^2); //this number i observed from the extent of image of digit"1"
if A<min
     Digit=1;
     min=A;
end

So is there someway to solve it using morph and logical operations only?

[Stephen23]

@koks paul: this is not twitter. I removed the ugly # characters from your tags, and separated them correctly using commas.

https://www.mathworks.com/matlabcentral/answers/help

https://www.mathworks.com/matlabcentral/answers/43073-a-guide-to-tags

[koks paul]

Thank you for making it look better, any help for the question itself?

Answer 1

[Walter Roberson]

No. The calculation

A=sqrt((0.4913)^2-Anum^2);

is not a morphological calculation.

Morphological operations transform one matrix to another matrix, but morphological operations never make decisions about what the input or output matrices mean. You always need a non-morophological operation to interpret the results of the transformation.

[koks paul]

Ok, good. Now i need to compare the segmented number, with the 9 numbers to decide what's the digit i got. What shall i use?

[Image Analyst]

Did you try OCR? http://www.mathworks.com/help/vision/ref/ocr.html#bt548t1-2_1

Answer 2

[Image Analyst]

I don't know how to do it using morphology (dilation, erosion, opening, and closing). You can do it using logical operations (and, or, exclusive or, not). Try using the Dice Sorensen coefficient (demo attached).

[koks paul]

it's not so much what i want to do, but thanks anyways