&lt;title&gt;Alias and the modulation transfer function: standardizing definitions for focal plane arrays&lt;/title&gt;

Smith, James Lynn

doi:10.1117/12.241957

Cited by 2 publications

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“…The bandwith of the optical subsystem is generally far greater than NBW so that high frequencies outside NBW can be sampled and aliasing will occur. 1 Aliasing means the sidebands introduced by sampling fall into the baseband and cannot be stopped even by ideal reconstruction filter.…”

Section: Introductionmentioning

confidence: 99%

Superresolution techniques in optoelectronic imaging systems

et al. 2001

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We analyze superresolution techniques in optoelectronic imaging systems. Sampling is necessity in optoelectronic imaging systems. Aliasing will occur when sampling an object containing frequencies exceeding half the sampling rate, i.e., high frequencies will overlap with low frequencies and significantly degrade image quality. The schemes of expanding the unaliased bandwith and recovering the aliased high frequencies are referred to as superresolution techniques here, including techniques of microscanning (MS), microzooming (MZ) and dual-magnification (DM). They all exploit series of frames of the same object, but different in image acquisition and processing. MS using subpixel shift frames is simple in reconstruction, but complex in shift machine. MZ using different magnification frames is less complex in machinery, but needs data processing in spectrum. DM can achieve the results similar to MS or MZ with fewer undersampled frames, but only suitable to periodic targets. Theoretical comparison and computer simulations about these techniques are presented.

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Section: Introductionmentioning

confidence: 99%