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pincushion distortion

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pincushion distortion

(pin -kû-shŏn) See distortion.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

pincushion distortion

[′pin‚ku̇sh·ən di‚stȯr·shən]
(electronics)
Distortion in which all four sides of a received television picture are concave (curving inward).
(optics)
Aberration in which the magnification produced by an optical system increases with the distance of the object point from the optical axis, so that the image of a square has concave sides.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive
The collector of pincushions has arguably the widest scope of all sewing accessories to chase, partly because needlewomen often made their own.
Each head is composed of a circle of bracteoles, which look at first sight like petals, containing a multitude of tiny flowers - the pins in the pincushion - forming a large umbel at the top of 2ft stems.
The NMAI pincushion created quite a stir among students of Northeastern decorative arts.
THESE small heart-shaped embroidered cushions decorated with beads, lace and tassels also date from the First World War and are known as sweetheart pincushions.
I felt very sorry for the poor patient who Andy turned into a pincushion as he tried to insert a needle into his vein.
I didn't want to be a pincushion, so when they suggested WeightWatchers, I said I would give it a go."
The use of Spanish phrases only bolster the author's beautiful metaphors, one of which compares her heart to a fragile pincushion. In its entirety, the story reads like a digression, a trip that takes the winding road to get to its destination.
"How are you going to do that ending?" They're referring to a finale in which the ambitious Washizu, memorably played by Toshiro Mifune, is shot through with arrows until he resembles a human pincushion or a dying porcupine.
Flowering from July to September in a riot of purples, oranges and pinks, these anemone flowering dahlias boast elongated outer petals around a dense centre of small often tubular petals that have a pincushion appearance.
In fact, the Toy Fair also features Printies from Techno Source, which can be used to upload a picture of Madoff and make a low-budget Bernie doll fit to be a diabolical pincushion. (ANI)
At one point, Angus's mum is meant to dazzle all the Army officers with her beauty - even though she has turned up to a posh dinner looking like a stuffed velvet pincushion. And it's the flesh and blood stars - not the CGI monster - who lack expression.
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