How to extract License plate Based on character identification

The summary of the work is to input a binary image with license plate text characters and extract the license plate region based on the text characters. The following pseudocode is intended to achieve this, (However am stuck at a point right now)

1. Identify and label connected components of the image (as expected, this includes other invalid connected components)

2. compute aspect ratio from bounding box of connected components identified and labelled

3. filter connected components that does not meet criteria based on character text aspect ratio.

4. fill bounding box of remaining valid connected component with white pixels

5. morphological dilate the image in order to get character text region connected, forming a larger component.

6. identify and label the new connected components of the image

7. compute the aspect ratio of bounding boxes of new connected components and filter components that do not meet license plate aspect ratio criteria.

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Attached is the input binary image and a snippet of what i have done and where am finding difficult. Your contributions and suggestions are highly appreciated. thank you

[Walter Roberson]

http://www.mathworks.co.uk/matlabcentral/answers/43073-a-guide-to-tags