It is a form of optical aberration that may be distinguished from other aberrations such as spherical aberration, coma, chromatic aberration, field curvature, and astigmatism in a sense that these impact the image sharpness without changing an object shape or structure in the image (e.g., a straight line in an object is still a straight line in ...

In optics, aberration is a property of optical systems, such as lenses, that causes light to be spread out over some region of space rather than focused to a point. [1] Aberrations cause the image formed by a lens to be blurred or distorted, with the nature of the distortion depending on the type of aberration.

Distortion is a monochromatic optical aberration describing how the magnification in an image changes across the field of view (FOV) at a fixed working distance (WD); this is critically important in precision machine vision and gauging applications.

Distortion is an aberration commonly seen in stereoscopic microscopy, and is manifested by changes in the shape of an image rather than the sharpness or color spectrum. The two most prevalent types of distortion, positive and negative (often termed pincushion and barrel, respectively), can often be present in very sharp images that are ...

2025年1月6日 · In the field of optics, distortion refers to the ways images can become warped or skewed when viewed through a lens. This optical aberration occurs when straight lines in the real world appear curved or altered in an image, affecting overall image quality.

The aberration function of distortion is given by: W t = Gρcosθ (27) with G=gdα 3 being the peak distortion aberration coefficient, g being the aberration coefficient (α is the field angle and d the aperture radius), and θ is the pupil angle.

There are five monochromatic aberrations: spherical aberration, coma, astigmatism, Petzval field curvature, and distortion. Each can be present even if the optical system is being used with monochromatic light, e.g. a laser. They differ in appearance and their dependence on f/# and field height (distance from the optical axis).

Let us suppose that, by dint of great labour and overcoming many obstacles, we have finally designed a lens system that is free from chromatic aberration, spherical aberration, astigmatism, coma and curvature of field, or at least have minimized these aberrations or have come to a tolerable compromise for a particular purpose, can we at last relax?

5 天之前 · Distortion alters the shape of an image, leading to inaccuracies. There are two primary types of distortion: Barrel Distortion: This causes the image to bulge outward, making the center appear larger than it is. Pincushion Distortion: This creates a pinched look at the image’s center, making the edges appear tighter.

Aber­ra­tions are the pri­ma­ry cause of reduced acu­ity in lens­es that are cor­rect­ly focused. There are five types you should know about, chro­mat­ic aber­ra­tion, spher­i­cal aber­ra­tion, cur­va­ture of field, coma, and astig­ma­tism. Chro­mat­ic aber­ra­tions man­i­fest them­selves as fringes of colour on high-con­trast edges.