This is both a compactly formulated project and a rather exciting challenge to meet. While the 100ms max search time is clear the hardware resources to meet it are not quite clear (i.e. PC, GPU, what CPU/GPU power is available...). From my end I would prefer C++ in a compact command line design which can be latter extended into C# and/or integrated in a GUI framework. Do you have any development data available (i.e. a database with various target and template images)?
With my bid I offer 30 days of work to make it happen. Please ignore the milestone, far to early for it but it is demanded by this bidding tool. If interested we can clarify the details latter.
Kind regards,
x3x7