>So to contiue on.....I think the resolution can be as large as 4" square.

I would be tempted to have a single sensor that detected the object hitting
the target, and then use a pair of simple CCD cameras, one at each top
corner faced to the diagonal opposite bottom corner of the target, and
compute X-Y coordinates from these. This way the sensor could be mounted
almost anywhere on the target, and an acceleration sensor such as an ADXL202
suggests itself as a suitable means of detecting the strike.

When the object hits a signal is sent to each camera to capture the frame
for processing. Normal web cams would probably be too slow for this, as I
doubt you would be able to get the trigger signal through a PC and out to
the camera fast enough to make it capture at the critical time, but if you
had a means of making the camera capture a single image from an external
signal, then your download speed does not need to be fast. Then some image
processing of the two images provides the point of impact.

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