shadow region

shadow region

[′shad·ō ‚rē·jən]
(electromagnetism)
Region in which, under normal propagation conditions, the field strength from a given transmitter is reduced by some obstruction which renders effective radio reception of signals or radar detection of objects in this region improbable.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The node M[N.sub.1] ([x.sub.m], [y.sub.m]) in the shadow region has communication range with radius [r.sub.0].
The reason for this phenomenon is that the border of the shadow region had a gradient of intensity.
In the shadow region, due to the diffraction rays at the shadow boundary lines, the creeping ray fields occur.
This is because most deep-sky objects are much fainter than starlight, so they get recorded at the shadow region of the histogram.
[[mu].sup.R.sub.in]: The mean value of image red component inside the shadow region.
We could successfully detect the plaque boundary in the guide wire shadow region by using the newly proposed hybrid boundary detection method.
Then shadow region and nonshadow region are separated.
For example, we consider one continuous shadow region in the interval [[y.sub.m], [y.sub.n).] We call the point ([y.sub.n], [z.sub.n)] as a "turning point" because it is a start of a shadow region interval from right side to left side.
The depicted shadow region is a right circular cylinder with the singularity on its axis.
They used a HSV color space and exploit the statistical assumptions that in a shadow region, the brightness and saturation properties are reduced while hue properties remain same.
Mostly, an object higher than its surroundings, such as a mountain, hill, radio tower, church steeple, tree, person, or boat mast located within or along the edge of the charge shadow region, is targeted.
Furthermore, there is no color information in the shadow region due to the fact that the regions contain predomithat the regions contain predominantly gray tones (low valence in Fig.