Working with Java crop functionality

Hello Experts,
I am using a PHP application and would like to realize a small functional adaption to it. It is a genealogy program.
In the application you can upload photos and assign them to a person, family, or group of people. In the program you can also assign a default photo to a person. That will be used in case you generate reports.  In case you have only one picture of someone you are sometimes forced to crop out of a section of a larger picture. This works fine but in de query that shows all photos in the program you see a double pictures and is not space efficient.
This can be done more efficient by using a java crop script. With this kind of script you are able to select a region in a bigger picture and store the coordinates of that region (captured in a URL) in the db. And assign only that value as a default picture without saving a second partial copy of the larger one.  
Ive been searching for this functionality that comes close and found it more or less in this functionality:

http://www.defusion.org.uk/demos/060519/cropper.php?demoType=preview&image=castle&formSubmit=Load+demo

It has an excellent user interface that works very intuitive.
But I am not very good in creating code. But can assemble if I have all the parts.
My EE question is:
Can someone please provide me(based on this code and UI) with the code that creates a URL  like the sample creates the preview. And a  basic viewer code that can show the part of the picture with the information stored in the URL?
Thanks,
Steynsk
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