defocus
- noun
- /dɪˈfoʊkəs/
:
desenfoque
- In photography, a small amount of defocus can create a pleasing blurred effect in the background.
Examples
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The picture was taken in a state of defocus, making it hard to see the details clearly.
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And so he got a whole stack of pictures that are in different degrees of defocus, and one of them is pretty much in focus.
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So in fact, you could think of the defocusing that we did on the image of Fourier.
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However, type II systems will work better if the natural guide star is used to measure other low-order wavefront terms, such as defocus.
Academic text (1994) -
For fast electrons passing through sufficiently thin crystals, the defocus information yields the Laplacian of the projected potential of the crystal.
Academic text (2001) -
The detection of defocus in photon-starved circumstances is best done with a radially symmetric sensor.
Academic text (1994) -
So, in order to see phase, optical microscopists have for a long time used a slight defocus of the system, a form of propagation-induced phase contrast.
Academic text (2001) -
The transport-of-intensity equation naturally describes the effect of a small defocus on the sample and so permits the recovery of phase without the need for holography or interferometry.
Academic text (2001) -
Since a small defocus of an imaging system is equivalent to propagation over a small distance, it is straightforward to acquire the necessary data set for propagation-based phase measurement using the transport-of-intensity equation.
Academic text (2001) -
Ocular visual impairments include cases of optical scatter (cataracts) or defocus (refractive error) and retinal scars and dystrophies.
Academic text (2009)
Synonyms
3
8.4
A fault in a lens or mirror that makes images look wrong
2
4.5
A lack of clear detail in what you see or in a picture
2
5.8
A blurry picture or idea hard to see and understand
Lack of clear detail that makes pictures or thoughts hard to understand
A soft, blurred effect in a picture or recording that makes details unclear
A fault in a lens or mirror that makes images look unclear
Antonyms
How Clear
146
4.2
Surface Forms
Morphology
Etymology
Defocus comes from the prefix de- meaning 'remove' and focus meaning a 'clear point' or the sharp part of a picture, just like the familiar word focus. So as a noun, defocus is the state when an image or view is not sharp.