Frequency domain zero padding for accurate autofocusing based on digital holography

2018 ◽  
Vol 72 (1) ◽  
pp. 57-65 ◽  
Author(s):  
Jun Geun Shin ◽  
Ju Wan Kim ◽  
Tae Joong Eom ◽  
Byeong Ha Lee
2017 ◽  
Author(s):  
Jun Geun Shin ◽  
Ju Wan Kim ◽  
Jae Hwi Lee ◽  
Byeong Ha Lee

ACTA IMEKO ◽  
2016 ◽  
Vol 5 (3) ◽  
pp. 47
Author(s):  
Dusan Agrez ◽  
Damir Ilic ◽  
Janko Drnovsek

<p class="Abstract"><span lang="EN-US">This paper presents the procedure to improve the estimation of the basic sinusoidal signal parameters (frequency, amplitude, and phase, respectively)</span><span lang="EN-US"> in the case of signal sampling by averaging in the aperture time. Prior to estimation in the frequency domain by the interpolated DFT algorithms the sampled signal is padded with the signal average values in the aperture times and zeroes in the rest of the sampling interval. We can increase padding points and a number of the signal cycles in the whole measurement interval and with this nearing the errors to the level as with estimation of the signal without average sampling even the sampling Nyquist condition is not fulfill.</span></p>


Author(s):  
Sujin Kim ◽  
Keonkook Lee ◽  
Jongsub Cha ◽  
Joonhyuk Kang ◽  
Naesoo Kim ◽  
...  

1990 ◽  
Vol 26 (8) ◽  
pp. 1863-1863
Author(s):  
Paul Marschall ◽  
Baldur Barczewski
Keyword(s):  

2018 ◽  
pp. 40-43
Author(s):  
V.V. GRIGORIEV ◽  
◽  
V.E. KRAVTSOV ◽  
A.K. MITUEV ◽  
E.A. MOROZ ◽  
...  

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