In most real world situations a vision researcher is presented with some particular apparatus left from a previous era or a finite sum of money with which to purchase new equipment. In the latter case, he examines the available suppliers and rapidly finds that it is easy to meet most of the requirements within the specified budget but that straying outside the scope of commodity products causes the cost to increase alarmingly. What can be done to squeeze that extra bit of resolution from the system? In many cases it is possible to trade an excess of one parameter for an improvement in another although if the system only just cuts the mustard on all accounts then almost certainly nothing further can be done.

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