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Optically, defocus refers to a translation of the focus along the optical axis away from the detection surface. In general, defocus reduces the sharpness and contrast of the image. What should be sharp, high-contrast edges in a scene become gradual transitions. Fine detail in the scene is blurred or even becomes invisible.
Defocus; Spherical aberration; Coma; Astigmatism; Field curvature; Image distortion; Although defocus is technically the lowest-order of the optical aberrations, it is usually not considered as a lens aberration, since it can be corrected by moving the lens (or the image plane) to bring the image plane to the optical focus of the lens.
In photography, soft focus is a lens flaw, in which the lens forms images that are blurred due to uncorrected spherical aberration.A soft focus lens deliberately introduces spherical aberration which blurs fine texture in the image while retaining sharp edges across areas of high contrast; it is not the same as an out-of-focus image, and the effect cannot be achieved simply by defocusing a ...
Defocus aberration, blurring of an image due to incorrect focus Gaussian blur , a graphic-art effect Motion blur , blurring of an image due to movement of the subject or imaging system
In idealized ray optics, where rays are assumed to converge to a point when perfectly focused, the shape of a defocus blur spot from a lens with a circular aperture is a hard-edged circle of light. A more general blur spot has soft edges due to diffraction and aberrations, [5] [6] and may be non-circular due to the aperture shape. Therefore ...
This can act as a monocular cue even when all other cues are removed. It may contribute to depth perception in natural retinal images, because the depth of focus of the human eye is limited. In addition, there are several depth estimation algorithms based on defocus and blurring. [20] Some jumping spiders are known to use image defocus to judge ...
The eye, like any other optical system, suffers from a number of specific optical aberrations. The optical quality of the eye is limited by optical aberrations, diffraction and scatter . [ 1 ] Correction of spherocylindrical refractive errors has been possible for nearly two centuries following Airy's development of methods to measure and ...
Eye focusing ideally collects all light rays from a point on an object into a corresponding point on the retina. A demonstration of camera focus on different distances, showing a bamboo rooftop Text on a page that is partially in focus, but mostly not in varying degrees