Example 521

A first example examines the linear Fourier model for intensity contrast when the object is a single black spot of width, 2a. Assume that the spot contrast is unity (Cobj = 1). For simplicity, work in one dimension, x. Let the DSF be modeled by the hyperbolic Hill function:

Figure 5.2-4 illustrates this system. The Fourier transform of this DSF is well known:

The one-dimensional, "black spot" object is centered over the ommatidium. It is described by p(x) = Io {1 - [U(x + a) - U(x - a)]} 5.2-23

The one-dimensional Fourier transform of the object can be shown to be

P(u) = lo n ยง(u) - 2a sin(au) J = lo {2 n 8(u) - (2a) sinc(au/ n)} 5.2-24

Of interest is the intensity contrast when the spot is at x = x, and when it is directly over the ommatidium (x = 0),

Black spot



Was this article helpful?

0 0
Peripheral Neuropathy Natural Treatment Options

Peripheral Neuropathy Natural Treatment Options

This guide will help millions of people understand this condition so that they can take control of their lives and make informed decisions. The ebook covers information on a vast number of different types of neuropathy. In addition, it will be a useful resource for their families, caregivers, and health care providers.

Get My Free Ebook

Post a comment