Apr 3, 2009 ... Firstly, the relation between maximal image gradient and defocusing amount is calibrated. Secondly, the maximal gradient of image is ...
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Apr 25, 2006 ... Defocusing amount is taken as positive when the sample is moved toward the objective and is taken as negative when the sample is moved ...
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Defocusing the telescope to improve photometry appears at first glance to be counter intuitive – we normally spend a significant amount of effort trying to improve ...
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It follows that geometrical optics does not describe diffraction optics very well for any reasonable amount of defocusing. Calculation of the diffraction OTF is ...
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Aug 1, 2006 ... Experimental contrast profiles of the same ruffle for negative and positive defocusing amounts confirm these inversions (Fig. 3). In fact, the ...
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Finally, we demonstrate that defocusing can be put to good use. A slight amount of defocusing, in conjunction with a compensation algorithm, can be used to ...
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Because of the low-pass characteristic of out-of-focus blur, a practical method is to automatically defocus a camera lens with the desired blur level to limit the ...
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less defocus and cannot blur the background the way a large- aperture single- lens reflex (SLR) lens can (Fig. 2). While a smaller amount of defocus (larger ...
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Defocus aberration - Wikipedia, the free encyclopedia
en.wikipedia.org/wiki/Defocus_aberration
Low f-numbers, such as f/1.4 to f/2.8, are very sensitive to defocus and have very shallow depths of focus. High f-numbers, in the f/16 to f/32 range, are highly ... |
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clearance (i.e. off-axis amount) may produce defocus information. In the region near focus, ... simplest type that can detect both defocusing amount and direction.
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