distortion


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distortion

 [dis-tor´shun]
1. the state of being twisted out of a natural or normal shape or position.
2. in psychology, the process of altering or disguising unconscious ideas or impulses so that they become acceptable to the conscious mind.
3. in optics or radiology, deviation of an image from the true outline or shape of an object or structure; it may be a change in size or shape, an elongation, a foreshortening, or a magnification. See illustration.
A, Barrel distortion; B, pincushion distortion. From Dorland's, 2000.

dis·tor·tion

(dis-tōr'shŭn),
1. psychiatry a defense mechanism that helps to repress or disguise unacceptable thoughts.
2. dentistry permanent deformation of the impression material after the registration of an imprint.
3. A twisting out of normal shape or form.
4. ophthalmology unequal magnification over a field of view.
[L. distortio, fr. dis-torqueo, to wrench apart]

distortion

(dĭ-stôr′shən)
n.
Psychology The modification of unconscious impulses into forms acceptable by conscious or dreaming perception.

dis·tor′tion·al, dis·tor′tion·ar′y, dis·tor′tive adj.

dis·tor·tion

(dis-tōr'shŭn)
1. psychiatry A defense mechanism that helps to repress or disguise unacceptable thoughts.
2. dentistry The permanent deformation of the impression material after the registration of an imprint.
3. A twisting out of normal shape or form.
4. ophthalmology Unequal magnification over a field of view.
[L. distortio, fr. dis-torqueo, to wrench apart]

distortion

Aberration of an optical system resulting in an image which does not conform to the shape of the object, somewhat resembling the image viewed through a cylindrical lens. This is due to an unequal magnification of the image. Distortion can be barrel-shaped (barrel-shaped distortion) in which the corners of the image of a square are closer to the centre than the middle part of the sides; or pincushion (pincushion distortion) in which the corners of the image of a square are farther from the centre than the middle part of the sides (Fig. D10). Example of barrel-shaped distortion: a square object seen through an uncorrected negative spectacle lens. Example of pincushion distortion: a square object seen through an uncorrected positive spectacle lens. See correction; fisheye lens; sine condition.
Fig. D10 Distortion (O, object; A, pincushion distortion; B, barrel-shaped distortion)enlarge picture
Fig. D10 Distortion (O, object; A, pincushion distortion; B, barrel-shaped distortion)

dis·tor·tion

(dis-tōr'shŭn)
1. In dentistry, permanent deformation of the impression material after the registration of an imprint.
2. A twisting out of normal shape or form.
[L. distortio, fr. dis-torqueo, to wrench apart]

Patient discussion about distortion

Q. what does c4-5 mild central disk bulging impinging upon cervical cord without spinal stenosis or distortion of the cord . mild righ neural foraminal narrowing from uncovertebral joint hypertropy mean

A. Well this basically means there is a very small narrowing of the cervical (your neck area) spinal canal (where the spinal cord is), however the narrowing does not cause any damage to the spinal cord, therefore probably does not cause any major symptoms involving the nerves. The c4-5 bulging part refers to the part in between the two cervical vertebras c4 and c5, in which the disc (a part in the spinal cord) is sliding a bit side-ways, but again, it does not seem to be causing any trouble.

More discussions about distortion
References in periodicals archive ?
Faugeras, "Straight lines have to be straight: Automatic calibration and removal of distortion from scenes of structured environments," Machine Vision and Applications, Vol.
"Our technology makes it possible to compensate for both static and thermal distortion. This can lead to a fuel saving of two to three percent in combustion engines, and remove one step in their production," says IWU head of department Andre Bucht.
We also carry out a simulation analysis in order to illustrate how this new distortion operator improves upon the limitations of Wang's original distortion, in particular, those discussed in Wang (2004).
For the country and for all of us to move forward as a people, we must realize that national transformation begins, not with lies and distortions, but with truth and reality.
In other words, "distortion simply occurs when we use the wrong lens or the wrong focal length".
As Orban switches between the processors, attendees will be able to hear the differences in both loudness and distortion.
An improvement of approximately 33% was achieved by reducing the raceway distortion through the optimization of the flange design.
However there are loads and devices on the system that have nonlinear characteristic which is affected both voltage and current signal and result in harmonic distortion causing poor power quality.
Thus it is used for reducing the harmonics by using the Total Harmonic Distortion (THD) method by which we gain the two voltages of the system in a reduced form and the hardware reads the voltage, frequency of the system.
Rapporteur Salvatore Cicus draft report for the Committee on International Trade (INTA) of the European Parliament explains the principle behind the report stating, it is crucial to understand whether the concept and the definition of significant distortions is clear enough and legally strong to justify the use of the alternative methodology.
Second, for distortion correction, ([x.sub.dist], [y.sub.dist]), the distorted coordinates in the normalized camera coordinate system, are calculated as
To reflect the distortion strength in agreement with ground truth of subjective scores, we combine the necessary knowledge of a successful IQA algorithm design, including the information of source image, distortion, and the human visual system (HVS) [23].

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