Depth Estimation and Focus Recovery
... image processing like aberrations of camera, structure of zoom lens, blurring model and geometric optics and so on. Later, we will make a introduction to Fourier Optics and optics analyzed by the linear canonical transform (LCT). Usually the “depth” we know means “the distance between the observer a ...
... image processing like aberrations of camera, structure of zoom lens, blurring model and geometric optics and so on. Later, we will make a introduction to Fourier Optics and optics analyzed by the linear canonical transform (LCT). Usually the “depth” we know means “the distance between the observer a ...
amplitude transfer function
... our analysis has been “diffraction–limited” • Aberration effects on the MTF are FoV (field) location–dependent: typically we get more blur near the edges of the field (narrower MTF ⇔broader PSF) • This, in addition, means that real–life optical systems are not shift invariant either! • ⇒ the concept ...
... our analysis has been “diffraction–limited” • Aberration effects on the MTF are FoV (field) location–dependent: typically we get more blur near the edges of the field (narrower MTF ⇔broader PSF) • This, in addition, means that real–life optical systems are not shift invariant either! • ⇒ the concept ...
fourier2012.pdf
... A wire screen with .1mm cells, and wire thickness of 25µm is illuminated by a .6328µm laser and the diffracted light is Fourier transformed with a lens with a focal length of F=250mm. Remember, when the grating is illuminated the wires are opaque and the space in between passes light. Sketch and dim ...
... A wire screen with .1mm cells, and wire thickness of 25µm is illuminated by a .6328µm laser and the diffracted light is Fourier transformed with a lens with a focal length of F=250mm. Remember, when the grating is illuminated the wires are opaque and the space in between passes light. Sketch and dim ...
Fabrication and Application of Phase only Holograms for High
... Three types of glass substrates were used in the study: 25 mm× 25 mm×1 mm soda lime microscope slides from Carl Roth GmbH, GE 124 fused quartz slides from TED PELLA, Inc., and a 1 mm thick 25.4 mm in diameter fused silica window broadband AR coated for 350 – 700 nm from Thorlabs, Inc. In order to ac ...
... Three types of glass substrates were used in the study: 25 mm× 25 mm×1 mm soda lime microscope slides from Carl Roth GmbH, GE 124 fused quartz slides from TED PELLA, Inc., and a 1 mm thick 25.4 mm in diameter fused silica window broadband AR coated for 350 – 700 nm from Thorlabs, Inc. In order to ac ...
A simple method for Bragg diffraction in volume holographic gratings Heifetz,
... Consider a dielectric slab with a finite length L, thickness d, and refractive index n0. For simplicity, we assume that the slab is immersed in a medium with a matched refractive index n0. A holographic grating is written by optically inducing refractive index variations in the bulk of the slab. Fig ...
... Consider a dielectric slab with a finite length L, thickness d, and refractive index n0. For simplicity, we assume that the slab is immersed in a medium with a matched refractive index n0. A holographic grating is written by optically inducing refractive index variations in the bulk of the slab. Fig ...
Airy disk
In optics, the Airy disk (or Airy disc) and Airy pattern are descriptions of the best focused spot of light that a perfect lens with a circular aperture can make, limited by the diffraction of light. The Airy disk is of importance in physics, optics, and astronomy.The diffraction pattern resulting from a uniformly-illuminated circular aperture has a bright region in the center, known as the Airy disk which together with the series of concentric bright rings around is called the Airy pattern. Both are named after George Biddell Airy. The disk and rings phenomenon had been known prior to Airy; John Herschel described the appearance of a bright star seen through a telescope under high magnification for an 1828 article on light for the Encyclopedia Metropolitana:...the star is then seen (in favourable circumstances of tranquil atmosphere, uniform temperature, &c.) as a perfectly round, well-defined planetary disc, surrounded by two, three, or more alternately dark and bright rings, which, if examined attentively, are seen to be slightly coloured at their borders. They succeed each other nearly at equal intervals round the central disc....However, Airy wrote the first full theoretical treatment explaining the phenomenon (his 1835 ""On the Diffraction of an Object-glass with Circular Aperture"").Mathematically, the diffraction pattern is characterized by the wavelength of light illuminating the circular aperture, and the aperture's size. The appearance of the diffraction pattern is additionally characterized by the sensitivity of the eye or other detector used to observe the pattern.The most important application of this concept is in cameras and telescopes. Owing to diffraction, the smallest point to which a lens or mirror can focus a beam of light is the size of the Airy disk. Even if one were able to make a perfect lens, there is still a limit to the resolution of an image created by this lens. An optical system in which the resolution is no longer limited by imperfections in the lenses but only by diffraction is said to be diffraction limited.