pincushion distortion

irregular image produced when axial magnification is greater than peripheral magnification. See: Petzval surface.

pin·cush·i·on dis·tor·tion

(pin'kush-ŭn dis-tōr'shŭn) Irregular image produced when axial magnification is greater than peripheral magnification.
See: Petzval surface

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.

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Fig. D10 Distortion (O, object; A, pincushion distortion; B, barrel-shaped distortion)

单词	pincushion distortion
释义	pincushion distortion pincushion distortion (pin -kû-shŏn) See distortion. 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. pincushion distortion pincushion distortion irregular image produced when axial magnification is greater than peripheral magnification. See: Petzval surface. pin·cush·i·on dis·tor·tion (pin'kush-ŭn dis-tōr'shŭn) Irregular image produced when axial magnification is greater than peripheral magnification. See: Petzval surface 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)
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