Abstract

The information concentration of a legible microphotograph made at a reduction ratio of 1200 is computed to be over 2 × 106 bits/mm2. Reasons are adduced for using a mosaic of squares having sides equal to the reciprocal of the resolving power, each being capable of assuming one of two density ranges, as a model of a high contrast material for the computation of information capacity. It follows that the information capacity is equal to the square of the resolving power. This relation gives values of information capacity in good accord with the values computed by the Jones theory. The information capacity of a Kodak High Resolution Plate is computed to be 3.25 × 106 bits/mm2. That the product of reduction ratio times quality index equals the product of resolving power times the height of the lower case e in type to be copied is verified at the high reduction ratio, and this relationship is considered useful for engineering computations involving the copying of commonly used styles of type. The use of literal charts designed on the basis of information theory is suggested for the evaluation of microcopying systems.

© 1965 Optical Society of America

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