| 释义 |
field of view
field of viewn. pl. fields of view See field.field (fild)
n. 1. a piece of open or cleared land, esp. one suitable for pasture or tillage. 2. a. a piece of ground devoted to sports or contests; playing field. b. an area in which field events are held. 3. a sphere or branch of activity or interest: the field of teaching. 4. the area drawn on or serviced by a business or profession; outlying areas where practical activities or operations are carried on: our representatives in the field. 5. a job or research location away from regular workshop or study facilities, offices, or the like. 6. a. the scene or area of active military operations. b. a battleground. c. a battle. 7. an expanse of anything: a field of ice. 8. any region characterized by a particular feature, resource, activity, etc.: an oil field. 9. the surface of a canvas, shield, flag, or coin on which something is portrayed: a gold star on a field of blue. 10. all the competitors in a contest, or all the competitors except for the leader. 11. (in betting) all the contestants or numbers that are grouped together as one. 12. Physics. a. a region of space in which a force acts, as that around a magnet or a charged particle. b. the quantity defined by the force acting on a given object or particle at each point in such a region. 13. the entire angular expanse visible through an optical instrument at a given time. 14. the structure in a generator or motor that produces a magnetic field around a rotating armature. 15. Math. a number system that has the same properties relative to the operations of addition, subtraction, multiplication, and division as the number system of all real numbers. 16. the area of a photographic subject that is taken in by a lens at a particular diaphragm opening. 17. the total complex of factors within which a psychological event occurs and is perceived as occurring. 18. a unit of information, as a person's name, that combines with related fields, as an official title or company name, to form one complete record in a computerized database. v.t. 19. a. (in baseball and cricket) to catch or pick up (the ball) in play. b. to place (a player, group of players, or a team) in the field to play. 20. to answer skillfully: to field a difficult question. 21. to place in competition. 22. to put into action or on duty. v.i. 23. to act as a fielder in baseball or cricket. adj. 24. Sports. a. of, taking place, or competed for on the field and not on the track, as the discus throw or shot put. b. of or pertaining to field events. 25. of or pertaining to active combat service as distinguished from service in rear areas or at headquarters: a field soldier. 26. of or pertaining to a field. 27. working in the fields of a farm. 28. working as a salesperson, representative, etc., in the field: field agents. 29. grown or cultivated in a field. Idioms: play the field, Informal. a. to engage in a broad range of activities. b. to date a number of persons during the same period of time. [before 1000; Middle English, Old English feld] Field (fild)
n. 1. Cyrus West, 1819–92, U.S. financier. 2. Eugene, 1850–95, U.S. poet and journalist. field of view1. In photography, the angle between two rays passing through the perspective center (rear nodal point) of a camera lens to the two opposite sides of the format. Not to be confused with "angle of view."
2. The total solid angle available to the gunner when looking through the gunsight. Also called FOV.Thesaurus| Noun | 1. | field of view - the area that is visible (as through an optical instrument)fieldvisual percept, visual image - a percept that arises from the eyes; an image in the visual systemmicroscopic field - the areas that is visible through a microscopeoperative field - the area that is open during surgery |
Translationscampo di vistacampo visivofield of view
field of view (field) The area made visible by the optical system of an instrument such as a telescope at a particular setting. It is expressed in the form of its angular diameter. The field of view of a telescope usually increases with decreasing magnification, and depends on the eyepiece in use. A wide field may be obtained with specially designed eyepieces or with telescopes such as the Schmidt. If the telescope optics produce a flat field, the image will be focused at the center as well as at the edge of the field of view.Field of View The field of view of an optical system is the part of space or of a plane imaged by the system. The size of the field is determined by the system’s components—such as stops or the mounts of lenses, prisms, and mirrors—that restrict the beam of light rays. A distinction is made between angular and linear fields of view. The former is measured in angular units and is used in dealing with systems designed for observing very distant—essentially infinitely remote—objects; telescopes, field glasses, and many types of cameras are examples of such systems. The linear field of view is measured in millimeters or centimeters and is used with systems, such as microscopes, in which the distance to the object is small.  Figure 1
In Figure 1, A is the center of the system’s entrance pupil. The angular field of view is the angle 2ω at which the entrance port S1SS2 and the corresponding part of the object plane O1O2 can be seen from A. The linear field of view is the linear dimension O1O2. OO is the system’s axis of symmetry. In the general case, the planes O1O2 and S1S2 are not coincident, and vignetting with a ring width of BB1 occurs. If, however, the plane S1S2 is made coincident with the object plane, the boundary of the field of view is sharp. Efforts are made to achieve this effect in many optic tubes and other optical instruments by placing a field stop in the focal plane of the objective. The angular field of view in the object space is inversely proportional to the angular magnification of the system. In binoculars the field ranges from 5° to 10°, and in the largest telescopes it does not exceed a few minutes of arc. In special wide-angle photographic lenses it can reach 120° to 140° or even 180°. The vast majority of microscopes are fitted with a set of replaceable eyepieces whose magnifications and, consequently, linear fields of view 2l in the object space are different. Eyepieces with 2l = 18 mm are often used. In many eyepieces, however, the field is greater or smaller than this value. In polarizing microscopes and stereomicroscopes, eyepieces with a field of up to 25 mm (wide-angle eyepieces) are often used. The linear field of view of a microscope as a whole is equal to 2l/β, where β is the linear magnification of the microscope objective. field of view[′fēld əv ′vyü] (optics) The area or solid angle which can be viewed through an optical instrument. Also known as field. field of view Field of view in a head-up display.i. The angle between two rays passing through the perspective center of a camera lens to two opposite sides of the format.
ii. The total solid angle available when looking through a sight or a head-up display.
iii. The look angle of a seeker. See look angle.See FOV
See FOVfield of view
Synonyms for field of viewnoun the area that is visible (as through an optical instrument)SynonymsRelated Words- visual percept
- visual image
- microscopic field
- operative field
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