Meaning of "defocus" in the English dictionary

PRONUNCIATION OF DEFOCUS

defocus  [diːˈfəʊkəs]

GRAMMATICAL CATEGORY OF DEFOCUS

Defocus is a verb.

The verb is the part of the sentence that is conjugated and expresses action and state of being.

See the conjugation of the verb defocus in English.

WHAT DOES DEFOCUS MEAN IN ENGLISH?

Defocus aberration

In optics, defocus is the aberration in which an image is simply out of focus. This aberration is familiar to anyone who has used a camera, videocamera, microscope, telescope, or binoculars. Optically, defocus refers to a translation along the optical axis away from the plane or surface of best focus. In general, defocus reduces the sharpness and contrast of the image. What should be sharp, high-contrast edges in a scene become gradual transitions. Fine detail in the scene is blurred or even becomes invisible. Nearly all image-forming optical devices incorporate some form of focus adjustment to minimize defocus and maximize image quality. The degree of image blurring for a given amount of focus shift depends inversely on the lens f-number. 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 tolerant of defocus, and consequently have large depths of focus. The limiting case in f-number is the pinhole camera, operating at perhaps f/100 to f/1000, in which case all objects are in focus almost regardless of their distance from the pinhole aperture.

Definition of defocus in the English dictionary

The definition of defocus in the dictionary is to go out of focus. Other definition of defocus is to make to go out of focus.

CONJUGATION OF THE VERB TO DEFOCUS

PRESENT

Present

I defocus

you defocus

he/she/it defocuses

we defocus

you defocus

they defocus

Present continuous

I am defocusing

you are defocusing

he/she/it is defocusing

we are defocusing

you are defocusing

they are defocusing

Present perfect

I have defocused

you have defocused

he/she/it has defocused

we have defocused

you have defocused

they have defocused

Present perfect continuous

I have been defocusing

you have been defocusing

he/she/it has been defocusing

we have been defocusing

you have been defocusing

they have been defocusing

Present tense is used to refer to circumstances that exist at the present time or over a period that includes the present time. The present perfect refers to past events, although it can be considered to denote primarily the resulting present situation rather than the events themselves.

PAST

Past

I defocused

you defocused

he/she/it defocused

we defocused

you defocused

they defocused

Past continuous

I was defocusing

you were defocusing

he/she/it was defocusing

we were defocusing

you were defocusing

they were defocusing

Past perfect

I had defocused

you had defocused

he/she/it had defocused

we had defocused

you had defocused

they had defocused

Past perfect continuous

I had been defocusing

you had been defocusing

he/she/it had been defocusing

we had been defocusing

you had been defocusing

they had been defocusing

Past tense forms express circumstances existing at some time in the past,

FUTURE

Future

I will defocus

you will defocus

he/she/it will defocus

we will defocus

you will defocus

they will defocus

Future continuous

I will be defocusing

you will be defocusing

he/she/it will be defocusing

we will be defocusing

you will be defocusing

they will be defocusing

Future perfect

I will have defocused

you will have defocused

he/she/it will have defocused

we will have defocused

you will have defocused

they will have defocused

Future perfect continuous

I will have been defocusing

you will have been defocusing

he/she/it will have been defocusing

we will have been defocusing

you will have been defocusing

they will have been defocusing

The future is used to express circumstances that will occur at a later time.

CONDITIONAL

Conditional

I would defocus

you would defocus

he/she/it would defocus

we would defocus

you would defocus

they would defocus

Conditional continuous

I would be defocusing

you would be defocusing

he/she/it would be defocusing

we would be defocusing

you would be defocusing

they would be defocusing

Conditional perfect

I would have defocus

you would have defocus

he/she/it would have defocus

we would have defocus

you would have defocus

they would have defocus

Conditional perfect continuous

I would have been defocusing

you would have been defocusing

he/she/it would have been defocusing

we would have been defocusing

you would have been defocusing

they would have been defocusing

Conditional or "future-in-the-past" tense refers to hypothetical or possible actions.

IMPERATIVE

Imperative

you defocus
we let´s defocus
you defocus

The imperative is used to form commands or requests.

NONFINITE VERB FORMS

Infinitive

to defocus

Past participle

defocused

Present Participle

defocusing

Infinitive shows the action beyond temporal perspective. The present participle or gerund shows the action during the session. The past participle shows the action after completion.

TRANSLATION OF DEFOCUS

Find out the translation of defocus to 25 languages with our English multilingual translator.

The translations of defocus from English to other languages presented in this section have been obtained through automatic statistical translation; where the essential translation unit is the word «defocus» in English.

• Translator English - Chinese: 焦
• Translator English - Spanish: desenfoque
• English: defocus
• Translator English - Hindi: defocus
• Translator English - Arabic: يزيل التباؤر
• Translator English - Russian: расфокусировки
• Translator English - Portuguese: desfocagem
• Translator English - Bengali: defocus
• Translator English - French: défocalisation
• Translator English - Malay: Defocus
• Translator English - German: Unschärfe-
• Translator English - Japanese: ピンぼけ
• Translator English - Korean: 디 포커스
• Translator English - Javanese: Defocus
• Translator English - Vietnamese: defocus
• Translator English - Tamil: defocus
• Translator English - Marathi: डिफोकस
• Translator English - Turkish: bulanıklaştırma
• Translator English - Italian: defocus
• Translator English - Polish: nieostrości
• Translator English - Ukrainian: расфокусировки
• Translator English - Romanian: defocalizare
• Translator English - Greek: αποεστίασης
• Translator English - Afrikaans: Defocus
• Translator English - Swedish: defocus
• Translator English - Norwegian: defokus

10 ENGLISH BOOKS RELATING TO «DEFOCUS»

Discover the use of defocus in the following bibliographical selection. Books relating to defocus and brief extracts from same to provide context of its use in English literature.

Depth From Defocus: A Real Aperture Imaging Approach: A Real ...

This book is about passive techniques for depth recovery, where the scene is illuminated only by natural light as opposed to active methods where a special lighting device is used for scene illumination.

A.N. Rajagopalan, 1999

3-D Shape Estimation and Image Restoration: Exploiting ...

This book presents a coherent framework for the analysis & design of algorithms to estimate 3-D shape from defocused & motion blurred images, & to eliminate defocus & motion blur to yield 'restored' images.

Paolo Favaro, Stefano Soatto, 2007

Progress in Optics

Balancing of defocus aberration with spherical aberration or astigmatism 6.1. Focused beam We have seen that the depth of focus is quite large when the Fresnel number is small. Hence, the axial irradiance at a certain distance z < R in the ...

Emil Wolf, 2006

The Eye and Visual Optical Instruments

10.0 Introduction 225 10.1 Types of defocus 227 10.2 Defocus calculations 230 10.3 Depth-of-field 235 10.4 Focussing techniques 238 Exercises and problems 242 Summary of main symbols 243 References and bibliography 243 10.0 ...

George Smith, 1997

Handbook of Image Quality: Characterization and Prediction

The y-axis is JNDs of quality and the x-axis is defocus in mm, with zero defocus corresponding to the best focus position. The simplest model of lens MTF as a function of defocus is the blur circle (geometrical optics) approximation, in which the ...

Brian Keelan, 2002

Optical Imaging and Aberrations: Ray geometrical optics

and sinB— + cos6 dW r 36 (3- 13b) For a radially symmetric aberration W(r), a ray of zone r in the exit pupil plane intersects the Gaussian image plane at a distance ri from the Gaussian image point given by 3.3 DEFOCUS ABERRATION We ...

Virendra N. Mahajan, 1998

Proceedings of the 26th Conference of Spacecraft TTamp;C ...

In practice, the parabolic reflectors of deep space antennas are influenced by many factors, such as fabrication error, gravity and thermal deformation, which induce the feed deviating from the focus of the paraboloid. The feed defocus would ...

Rongjun Shen, Weiping Qian, 2012

Adaptive Optics for Vision Science: Principles, Practices, ...

manually or to set a range and step size (in diopters) for calibrated and automated defocus adjustment. The defocus can be adjusted in open-loop mode or closed-loop mode. In open-loop mode, the appropriate voltages to change the focus of ...

Jason Porter, Hope Queener, Julianna Lin, 2006

Characterizing Effects and Benefits of Beam Defocus on High ...

This dissertation makes contributions towards knowledge of optimizing of laser weapon performance when operating in the air-to-ground (ATG) regime in thermal blooming conditions.

Scott N Long, 2012

Progress in Optics

Balancing 0f defocus aberration with spherical aberration or astigmatism 6.1. Focused beam We have seen that the depth of focus is quite large when the Fresnel number is small. Hence, the axial irradiance at a certain distance 2: < R in the ...

‎2006

10 NEWS ITEMS WHICH INCLUDE THE TERM «DEFOCUS»

Find out what the national and international press are talking about and how the term defocus is used in the context of the following news items.

How Microsoft Almost Won Digital Advertising

That defocus culminated finally in the exit we saw last week from everything but search and paid search. But there was a time when Microsoft ... «AdExchanger, Jul 15»

Bongani Mbindwane

China has had a rough time getting lucrative assets in Europe, their defocus to Greece will also be potentially negative for South Africa as they ... «Daily Maverick, Jul 15»

DNA Test: It's all about Mi … the Xiaomi Mi4i, that is

Swipe left, and you get access to a panorama mode, night mode, manual, beautify mode and a refocus mode that helps to artistically defocus ... «Digital News Asia, Jul 15»

How CEOs can cope up with Digital disorientation

This also means that we have to defocus from some existing business areas. Digital organisations operate at a much higher clock speed and ... «Firstpost, Jul 15»

7 Deadly Sins of Sales

And don't let envy of your competitors strengths defocus you from the task at hand. Develop sales strategies that deliver the value your ... «Pulse, Jul 15»

DNA Test: HTC's One M9+ offers pluses aplenty

The defocus mode on the rear camera needs some distance to work – at least 30cm from a subject at the minimum – along with a suitable ... «Digital News Asia, Jun 15»

Sigma's Newest Full-Frame Wide Zoom Lens Has A Constant F2 …

That low aperture value means you'll be able to achieve great background defocus effects (bokeh), and the lens also includes Sigma's quiet ... «TechCrunch, Jun 15»

First Impressions Review of the New Panasonic Lumix G7

Auto Focus – Panasonic has improved the AF, including a technology called Depth From Defocus, which allows the G7 to calculate the ... «Resource Magazine, Jun 15»

Dell Venue 8 7000 with Intel RealSense Camera Launched in India

Also you can refocus or defocus any section of the image afterwards. Further, this intelligent technology, can can also do area measurements ... «Gizbot, Jun 15»

Kensington Launches SD4000 Universal USB Docking Station …

To move from one window to the next, or to pull up a completely new app or web browser, requires the user to defocus from the work at-hand. «MarketWatch, Jun 15»