apodization


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apodization

(ap″ŏ-dĭ-zā′shŏn)
1. Alteration of a surface by removal of its irregularities.
2. Introduction of a gradual change into a mathematical function that would otherwise be discontinuous. It is used in radiology to smooth out choppy signals, and in optics, to blend diffractive steps.
References in periodicals archive ?
Yuta Kawamura, marketing manager, electronic imaging division, Fujifilm Middle East and Africa, said: "If we study the history of lens and optics, an apodization filter has only been used on a manual focus lens.
Fienup, "Spatially variant apodization for sidelobe control in SAR imagery," Radar Conference, 132-137, 1994.
Bragg structure apodization leads to more uniformly CMD frequency characteristic in the Bragg transmission band (Figure 6(a), line 2), and transmitted wave packet is much less distorted (Figure 6(b), line 2).
For greater focus depths, all transducer elements may be used with Tx apodization accomplished by proportionately reducing the drive level to the elements farther from the center of the transducer.
1] resolution with 64 scans with a strong Norton-Beer apodization on a Perkin-Elmer model 1600 Fourier transform IR spectrometer (FTIR), in the wave-number range 4000-600 [cm.
1] data spacing, Happ-Genzel apodization, no smoothing of [[nu].
Image enhancement via sidelobe apodization is the subject of the final chapter.
In order to break through the diffraction limit, lots of ways to obtain super-resolution non-diffraction beam were presented and discussed such as hyperlens and super-oscillatory lens [9-11], utilizing superlens to turn evanescent waves into propagating waves and obtain subwavelength imaging [12, 13], handling of the evanescent waves with near field diffraction structures [2,14], and super-resolution apodization through pupil masks [14-18].
Apodization and chirping of grating can help side lobe reduction and pulse shaping, respectively.
FT-IR spectra were recorded by means of a Perkin-Elmer 1760-x Fourier transform infrared spectrometer using a deuterated triglycine sulphate detector and a normal Beer-Norton apodization function.
N-type data were acquired, and the data were processed with sinebell apodization in both dimensions.
Some of their technical tidbits (the gains of averted vision, how to dean optics, and what to expect of narrowband filters) are right on the money; others, like apodization and lunar transient phenomena, are controversial, and one - the otherwise unfiltered Herschel wedge for solar observing - is downright dangerous.