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Field of view

The field of view is the extent of the observable world, seen at any given moment. In the case of optical instruments or sensors it is a solid angle through which a detector is sensitive to electromagnetic radiation. In the context of human vision, the term "field of view" is only used in the sense of a restriction to what is visible by external apparatus, like when wearing spectacles or virtual reality goggles. Note that eye movements are allowed in the definition but do not change the field of view. If the analogy of the eye's retina working as a sensor is drawn upon, the corresponding concept in human is the visual field, it is defined as "the number of degrees of visual angle during stable fixation of the eyes". Note that eye movements are excluded in the definition. Different animals have different visual fields, among others, on the placement of the eyes. Humans have a over 210-degree forward-facing horizontal arc of their visual field, while some birds have a complete or nearly complete 360-degree visual field.

The vertical range of the visual field in humans is around 150 degrees. The range of visual abilities is not uniform across the visual field, varies from animal to animal. For example, binocular vision, the basis for stereopsis and is important for depth perception, covers 114 degrees of the visual field in humans; some birds have a scant 20 degrees of binocular vision. Color vision and the ability to perceive shape and motion vary across the visual field; the physiological basis for, the much higher concentration of color-sensitive cone cells and color-sensitive parvocellular retinal ganglion cells in the fovea – the central region of the retina, together with a larger representation in the visual cortex – in comparison to the higher concentration of color-insensitive rod cells and motion-sensitive magnocellular retinal ganglion cells in the visual periphery, smaller cortical representation. Since cone cells require brighter light sources to be activated, the result of this distribution is further that peripheral vision is much more sensitive at night relative to foveal vision.

Many optical instruments binoculars or spotting scopes, are advertised with their field of view specified in one of two ways: angular field of view, linear field of view. Angular field of view is specified in degrees, while linear field of view is a ratio of lengths. For example, binoculars with a 5.8 degree field of view might be advertised as having a field of view of 102 mm per meter. As long as the FOV is less than about 10 degrees or so, the following approximation formulas allow one to convert between linear and angular field of view. Let A be the angular field of view in degrees. Let M be the linear field of view in millimeters per meter. Using the small-angle approximation: A ≈ 360 ∘ 2 π ⋅ M 1000 ≈ 0.0573 × M M ≈ 2 π ⋅ 1000 360 ∘ ⋅ A ≈ 17.45 × A In machine vision the lens focal length and image sensor size sets up the fixed relationship between the field of view and the working distance. Field of view is the area of the inspection captured on the camera’s imager; the size of the field of view and the size of the camera’s imager directly affect the image resolution.

Working distance is the distance between the back of the target object. In tomography, the field of view is the area of each tomogram. In for example computed tomography, a volume of voxels can be created from such tomograms by merging multiple slices along the scan range. In remote sensing, the solid angle through which a detector element is sensitive to electromagnetic radiation at any one time, is called instantaneous field of view or IFOV. A measure of the spatial resolution of a remote sensing imaging system, it is expressed as dimensions of visible ground area, for some known sensor altitude. Single pixel IFOV is related to concept of resolved pixel size, ground resolved distance, ground sample distance and modulation transfer function. In astronomy, the field of view is expressed as an angular area viewed by the instrument, in square degrees, or for higher magnification instruments, in square arc-minutes. For reference the Wide Field Channel on the Advanced Camera for Surveys on the Hubble Space Telescope has a field of view of 10 sq. arc-minutes, the High Resolution Channel of the same instrument has a field of view of 0.15 sq. arc-minutes.

Ground-based survey telescopes have much wider fields of view. The photographic plates used by the UK Schmidt Telescope had a field of view of 30 sq. degrees. The 1.8 m Pan-STARRS telescope, with the most advanced digital camera to date has a field of view of 7 sq. degrees. In the near infra-red WFCAM on UKIRT has a field of view of 0.2 sq. degrees and the VISTA telescope ha

Bruno Gervais

Bruno Gervais is a Canadian former professional ice hockey defenceman. He played with the New York Islanders, Tampa Bay Lightning and the Philadelphia Flyers in the National Hockey League; as a youth, Gervais played in the 1997 Quebec International Pee-Wee Hockey Tournament with the Richelieu Laser minor ice hockey team. Gervais was selected in the sixth round of the 2003 NHL Entry Draft, 182nd overall, by the New York Islanders. Gervais was named captain of the Acadie-Bathurst Titan of the QMJHL as an 18-year-old though there were many veteran players. In his 19-year-old season he hurt his knee at the December tryout camp for team Canada's under 20 team, he missed the rest of the season. After scoring a career high 19 points in 63 games with the Islanders in the 2008–09 season, he was selected as the Nassau County Athlete of the Year Award in 2009. On June 25, 2011, he was traded after 7 seasons within the Islanders organization to the Tampa Bay Lightning for future considerations. Two days Gervais was signed by Tampa Bay to a one-year contract.

He played in 50 games during 2011 -- 12 season with the Lightning. After one season in Tampa Bay, Gervais signed a two-year contract as a free agent worth $1.65 million with the Philadelphia Flyers. Viewed as a depth defenseman, after a short stint with heilbronner Falken of the German 2nd Bundesliga, he filled in as the Flyers' sixth blue liner in the lockout shortened 2012–13 season. In the second year of his contract with the Flyers, Gervais failed to make the team out of training camp. After clearing waivers he was assigned to AHL affiliate, the Adirondack Phantoms, for the duration of the 2013–14 season. In 59 games he led the Phantoms on the Blueline with 26 points. On July 1, 2014, he was signed as a free agent to a one-year, two-way contract with the Colorado Avalanche. In the 2014 -- 15 season, Gervais was assigned to the Lake Erie Monsters; as a veteran and older statesman of the club, Gervais was selected as team captain. In 71 contests with the Monsters, he produced 13 points from the blueline, but was unable to lead the Monsters to the post-season.

On July 6, 2015, Gervais opted to return for a second attempt in Germany, securing a one-year contract as a free agent with DEL club, Eisbären Berlin. Gervais remained in Berlin for two seasons, before announcing his retirement from his 13-year professional hockey career on July 13, 2017, he has a brother, who played 8 games for the Cape Breton Screaming Eagles in the QMJHL before playing semi-professionally within Quebec. Gervais is the childhood best friend of fellow player Max Talbot whom he met while playing minor hockey in Quebec. Biographical information and career statistics from, or, or The Internet Hockey Database Bruno Gervais on Twitter

Angelica Bengtsson

Angelica Therese Bengtsson is a Swedish track and field athlete who specialises in the pole vault. She became the first pole vault winner at the inaugural Summer Youth Olympics in Singapore, 2010, she has been a successful youth and junior athlete, winning gold medals at the 2009 World Youth Championships and the 2010 World Junior Championships in Athletics. She set a mark of 4.47 m for the youth world record for the event in 2010 and broke the world junior record with a vault of 4.63 m in 2011. Bengtsson placed tied 4th at the 2015 World Championships in Beijing, having set a national record of 4.70 m in the final. She is the current Swedish national record holder with 4.81 m, set indoor in Clermont-Ferrand, France, on February 24, 2019. She has won eleven national titles, her father is Swedish and her mother is Afro-Brazilian. Born on 8 July 1993 in Väckelsång, Angelica Bengtsson started out in gymnastics and hoped to follow in her father's footsteps in the javelin throw, it became apparent that she had a talent for pole vaulting.

She enjoyed her first global victory at the 2009 IAAF World Youth Championships, where at the age of sixteen she won the pole vault gold medal with a clearance of 4.32 metres. This was a significant winning margin of 22 cm over the rest of the field. In spite of her youth, she took the national senior title at the Swedish Indoor Athletics Championships, beating her Swedish rivals with a clearance of 4.30 m. Bengtsson established herself as one of top youth athletes at the 2010 European Youth Olympic Trials in Moscow in May. Having won the competition, she improved the world youth record to 4.42 m and immediately improved upon this with a 4.47-metre clearance. She failed in her three vaults, her winning mark was enough to qualify her for the senior 2010 European Athletics Championships, but she opted to focus on the younger age category competitions instead. Building upon her youth gold from the previous year, she added another gold medal to her collection at the 2010 Junior World Championship in Moncton.

Although windy conditions reduced the level of performance, a first time clearance at 4.15 m sealed her victory over the older girls and she added an extra ten centimetres between herself and Holly Bleasdale for a winning mark of 4.25 m. Her achievements made her one of the headline athletes at the first Summer Youth Olympics in Singapore, she duly delivered on her favourite status by winning the competition at a height of 4.30 m. Dismissing the challenge of the Silke Spiegelburg's world junior record of 4.48 m, Bengtsson went straight for the Swedish senior record, but again 4.52 m proved too much for the young athlete. Bengtsson achieved that mark with a first time clearance at the Swedish Indoor Championships in February 2011, claiming both the world junior record and Swedish senior record at the same time. At the 2019 World Championships final, Bengtsson broke her pole in her third attempt on 4.80 m, thus having the right to re-take the attempt. She cleared that jump, which gave her 6th place in the competition, as well as a new Swedish outdoor record.

List of world under-20 records in athletics European Athlete of the Year Trophy Official website of Angelica Bengtsson Angelica Bengtsson at World Athletics Media related to Angelica Bengtsson at Wikimedia Commons

Ann Risley

Ann Risley is an American actress and comedian. She was a cast member of the TV series Saturday Night Live for the 12 episodes of the 1980–1981 season; these 12 broadcasts were the first episodes. Born Anna Risley in Madison, she was spotted by Woody Allen in a theatre production of his material and encouraged her to pursue an acting career in New York. Risley was cast in small parts in Allen's films Annie Hall and Stardust Memories. Before joining the cast of Saturday Night Live, she had a cameo on the show in 1976 as a psychiatrist's patient, she was cast for Saturday Night Live by Jean Doumanian, the show's guest-booker associate producer. After 12 episodes, Doumanian was let go and replaced by Dick Ebersol, who fired Gilbert Gottfried, Charles Rocket, Risley from the cast before his first episode. In a 1999 article in People, Risley was quoted as saying her SNL experience was "horrible". Prior to Saturday Night Live, Risley had roles in nine feature films, including Honky Tonk Freeway and Come Back to the Five and Dime, Jimmy Dean, Jimmy Dean.

She appeared in starring roles in two television pilots, was a five-week guest star on the daytime soap The Doctors, appeared in five made-for-TV movies, including The Young Riders and Telling Secrets. No longer a screen actor, Ann continues to run her own acting/improv studio in Arizona. Doria Reagan, wife of Ron Reagan Toni Tennille Rosalynn Carter Annie Hall as Susan Oliver's Story as Jane Manhattan as Mrs. Finch Simon as Pam Stardust Memories as Nurse Honky Tonk Freeway as Patricia Rich and Famous as Merideth Come Back to the Five and Dime, Jimmy Dean, Jimmy Dean as Martha Desert Bloom as Mrs. Muratore Saturday Night Live – Cast member – 1980-81 Season, NBC Off Campus – Bonnie – CBS Night After Night – Anne – MTM/CBS The Doctors – Hermione – NBC The Young Riders – Clerk/Wife – ABC series Telling Secrets – Sally DeVries – ABC miniseries Four Eyes and Six-Guns – Madame of Whore House – TNT film El Diablo – Judith – HBO film Sunstroke – Secretary – TNT film Come Back to the Five and Dime – Martha (and substitute for lead actresses Karen Black and Sandy DennisBroadway A Little Family Business – role of Connie – Ahmanson Theatre and Broadway A History of the American Film – – Arena Stage Uncommon Women – Rita-Huntington Theatre Spoon River Anthology – 16 roles – San Francisco Tour The Importance of Being Earnest – Cecily Private Lives – Amanda The Owl and the Pussycat – Doris Lovers – Maggie Same Time Next Year – Doris BAI – University of Wisconsin – Theatre Communications Various individual workshops in N.

Y. C. and San Francisco } The Studio For Actors Ann Risley on IMDb^ a b Gus Wezerek. "The'S. N. L.' Stars Who Lasted, the Ones Who Flamed Out". The New York Times. Archived from the original on 2019-12-14. Retrieved 2019-12-16; some of the names here will be familiar only to die-hard fans. ^ Clifford Terry. "'The struggle to keep Saturday Night Live'". Chicago Tribune. P. 31. Retrieved April 10, 2016. ^ "SNL Transcripts", ^ Ames Carlin, Peter. "SketchArtists". People. 52. ^ "Professional Training, Classes, & Private Study in Tucson, Arizona". The Studio for Actors. Retrieved 2017-06-11. ^ "Episodes | 11.15.1980 #4". SNL Archives. 1980-11-15. Retrieved 2017-06-11

1824 Haworth

1824 Haworth, provisional designation 1952 FM, is an asteroid from the outer region of the asteroid belt 14 kilometers in diameter. It was discovered on 30 March 1952, by Indiana University's Indiana Asteroid Program at its Goethe Link Observatory near Brooklyn, United States, named after physicist Leland John Haworth. Haworth orbits the Sun in the outer main-belt at a distance of 2.8–3.0 AU once every 4 years and 11 months. Its orbit has an inclination of 2 ° with respect to the ecliptic, its first precovery was taken at Lowell Observatory in 1906, extending the body's observation arc by 46 years prior to its official discovery observation at Goethe Link. According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Haworth measures 14.17 kilometers in diameter and its surface has an albedo of 0.266. As of 2017, its composition, rotation period and shape remain unknown, it was named in honor of American particle physicist Leland John Haworth, a graduate of Indiana University and second director of the National Science Foundation.

His long and varied career included teaching and serving as member of the Atomic Energy Commission, as vice-president and president of Associated Universities, Inc. and as director of the Brookhaven National Laboratory. His negotiations were instrumental for the funding of a 4-meter telescope at the Cerro Tololo Interamerican Observatory; the official naming citation was published by the Minor Planet Center on 18 April 1977. Asteroid Lightcurve Database, query form Dictionary of Minor Planet Names, Google books Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets - – Minor Planet Center 1824 Haworth at AstDyS-2, Asteroids—Dynamic Site Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info 1824 Haworth at the JPL Small-Body Database Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

Stig of the Dump (rapper)

Steve Dixon better known by his stage name Stig of the Dump, is an English rapper from Newcastle upon Tyne who built a reputation as a battle rapper in London lived in Spain for many years but has now returned to the United Kingdom. Stig's first major release was The Homeless Microphonist EP in 2006, followed by the Braindead 12", which featured RA the Rugged Man, he released his first full-length album, Mood Swings, in 2010. He is signed to Lewis Recordings. Stig is a regular on the battle-rap circuits, he gained notoriety for his impromptu battle with Asher D, at the film premiere of Life and Lyrics in 2006. He has appeared as a judge on Don't Flop; the Homeless Microphonist EP "Braindead" 12", featuring RA the Rugged Man I Got Game CD single Mood Swings LP "Cannon Fodder EP" "Record 1" Kubrick "Project Goon" - Legion of Goon Stig of the Dump - 1963 children's novel Stig of the Dump at AllMusic Stig of the Dump official website Stig of the Dump on Twitter