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Can you ask your questions in java programming terms?
The words you are using have no meaning when talking about a java program: signature, chain code and intersection
These words relate to your...

Can you ask your questions in java programming terms?
The words you are using have no meaning when talking about a java program: signature and junction.
These words relate to your problem, not how...

Please Edit your post and wrap your code with
<YOUR CODE HERE> to get highlighting

The program can not find the file. Make sure the file is located where the program is looking for it.

Please...

If you have an image in a BufferedImage object you can look at its pixels by using the getRGB method.

None of the terms you are using (signature, tablet, chain code, 8 connection, junctions) to...

Describe the algorithm that you are trying to code in more specific terms.
To get at the pixels in an image there is the getPixel methods for example.