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Artificial Intelligence and Soft Computing: Behavioral ... - Arteimi.info

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The representation is preferred by the following counts:<br />

i) It imposes no constraints on the parameters (a, b, p, q).<br />

ii) Parametric representations of the lines remain linear, which are<br />

advantageous to Kalman filtering optimization.<br />

Representation of Affine planes in R 3 : One way of representing 3-D<br />

planes is by a 3-D vector (a, b, p) such that points (x, y, z) of the plane are<br />

defined by the following equation.<br />

.<br />

a x + b y + z + p = 0<br />

Here the vector (a, b, 1) T is the normal to the plane <strong>and</strong> the point (0, 0, -p) T<br />

is the point of intersection of the plane with the Z-axis.<br />

(0, 0, -p)<br />

Y<br />

Z<br />

(a, b,1)<br />

X<br />

Fig. 17.16: A 3-D plane representation by (a, b, p).<br />

The limitation of this notation is that planes parallel to the Z axis can not be<br />

represented. More formally, we have three cases:<br />

Case I: Planes not parallel to the Z axis<br />

a x + b y + z + p=0 ( 17.17a)<br />

Case II: Planes not parallel to the X axis<br />

x + a y + bz + p = 0 (17.17b)

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