Looking for an annotated car database

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Hello,

I am looking for an annoteded vehicle database as seen by overhead camera (from a certain height, at an angle, like from a camera mounted on a lamp post). Most databases that I can find deal either with horizontal or vertical view, which is unfortunately not suitable for my application. I need to build a classifier for vehicle detection and it would save me some time if I did not have to annotate thousands of car images. Is there such a database available somewhere (for non-commercial, research purposes)?

EDIT:

Here is a couple of examples of scenes where I need to identify cars:

Either I somehow normalize the images and annotate cars myself or I can find some cars as seen from the above perspective to train my detector.

Thanks

Witek