FIGURE 5.2-4 Diagram relevant to the calculation of the intensity contrast of a retinula cell. A one-dimensional, black spot object is "shown" to an ommatidium whose retinula cells absorb light with a hyberbolic, Hill-type DSF.

lemn = jjo [(u)" sinc(au/rc)] exp^B^ |u| )e°du 5.2-26

i l = l J"2asin(au)l [b „nexp(-B Jul)]e0du 5.2-27

The integral above can be rewritten as a well-known definite integral, noting that the integrand is an even function in u:

Evaluation of this definite integral yields:

Thus, the intensity contrast is

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