How can I automatically crop a photo based on its content (a black border)?

I scanned hundred of negatives.
The scanner produced .jpg files.  Most of the scanned images show the negatives holder to one side as a black border.  The black border is thicker or thinner depending on the photo.
Please see pictures attached. 
Is there a way to automate the detection of such a border and remove it by cropping the photo?  Ideally I would like the processing to only remove the thickness that is required to keep the photo unaltered as much as possible.
I have Photoshop 12 and I know about Actions.  I just don't know how to tell the engine to only crop if it is required, and by how much.
This could save me days of manual work.  Thankyou.
Environment Information:
·  I am running Photoshop 12.1 *64 bit
·  Windows 7 Professional 64 bit
·  Amount of installed RAM: 6GB
·       Scanner:  Canon CanoScan 8800F
·  Amount of free disk space:
            C:\ - OS and Software disk - Total size:139GB showing 20GB free
            G:\ - Data disk - Total size:1.81 TB showing 437GB free
·  Make/Model of Video Card: NVIDIA GeForce 9600 GT

Thank you miss marple for your Image>Canvas Size... suggestion.  I used it to implement a semi automated process.
I programmed a couple of actions:
- one to trim all sides by 7 pixels
- one to trim the top side by 7 pixles
Then I assigned a shortcut key to each action.
Since I have to open each photo individually anyway to remove larger scratches (see my other post), it is easy to hit a couple of keyboard keys to trigger the relevant 'border removal' action.
The main thing is that in 95% of cases I don't have to use the mouse to fix the borders, but I use keyboard keys only.  It is a real time saver.

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