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Topic Review
FreeTrack
FreeTrack is a general-purpose optical motion tracking application for Microsoft Windows, released under the GNU General Public License, that can be used with common inexpensive cameras. Its primary focus is head tracking with uses in virtual reality, simulation, video games, 3D modeling, computer aided design and general hands-free computing to improve computer accessibility. Tracking can be made sensitive enough that only small head movements are required so that the user's eyes never leave the screen. A camera is positioned to observe a rigid point model worn by the user, the points of which need to be isolated from background light by means of physical and software filtering. Motion is tracked with up to six degrees of freedom (6DOF): yaw, pitch, roll, left/right, up/down and forward/back. Windows-compatible video devices like webcams are supported, as well as special Nintendo Wii Remote camera, iPhone Truedepth camera with Eyeware Beam, and NaturalPoint cameras (TrackIR, SmartNav and OptiTrack). FreeTrack can output head-tracking data to programs directly using its own open interface, as well as TrackIR, SimConnect and FSUIPC interfaces. Programs that support these interfaces are regarded as being FreeTrack-compatible. FreeTrack can also emulate mouse, keyboard, and joystick (via PPJoy) if a program does not support a direct interface. FreeTrack is coded in Delphi 7 and uses DirectShow and DirectX. Head tracking is achieved using implementations of DeMenthon's four-point iterative pose estimation algorithm (POSIT) and Alter's three point geometric algorithm.
  • 926
  • 24 Oct 2022
Topic Review
Lemniscatic Elliptic Function
In mathematics, a lemniscatic elliptic function is an elliptic function related to the arc length of a lemniscate of Bernoulli studied by Giulio Carlo de' Toschi di Fagnano in 1718. It has a square period lattice and is closely related to the Weierstrass elliptic function when the Weierstrass invariants satisfy g2 = 1 and g3 = 0. In the lemniscatic case, the minimal half period ω1 is real and equal to where Γ is the gamma function. The second smallest half period is pure imaginary and equal to iω1. In more algebraic terms, the period lattice is a real multiple of the Gaussian integers. The constants e1, e2, and e3 are given by The case g2 = a, g3 = 0 may be handled by a scaling transformation. However, this may involve complex numbers. If it is desired to remain within real numbers, there are two cases to consider: a > 0 and a < 0. The period parallelogram is either a square or a rhombus.
  • 2.0K
  • 24 Oct 2022
Topic Review
Acute and Obtuse Triangles
An acute triangle (or acute-angled triangle) is a triangle with three acute angles (less than 90°). An obtuse triangle (or obtuse-angled triangle) is a triangle with one obtuse angle (greater than 90°) and two acute angles. Since a triangle's angles must sum to 180° in Euclidean geometry, no Euclidean triangle can have more than one obtuse angle. Acute and obtuse triangles are the two different types of oblique triangles — triangles that are not right triangles because they have no 90° angle.
  • 780
  • 24 Oct 2022
Topic Review
Persona Q: Shadow of the Labyrinth
Persona Q: Shadow of the Labyrinth is a role-playing video game developed by Atlus for the Nintendo 3DS . It is part of the Persona series, itself part of the larger Megami Tensei franchise. It was published across all territories in 2014: released in June in Japan, November in North America and Europe, and December in Australia. Atlus published the game in Japan and North America, while NIS America published it in the PAL region. The story of Persona Q is a crossover between Persona 3 and Persona 4, whose characters are drawn from their respective time periods by an unknown force and sent into a replica of Persona 4's Yasogami High School in another world. Meeting with Zen and Rei, two people whose memories were taken, the groups must unite and explore four labyrinths in the school to recover treasures hidden within. These treasures can restore Zen and Rei's memories which might help them find a way to escape. The gameplay fuses elements of the Persona and Etrian Odyssey series, and focuses on first-person dungeon crawling through labyrinths and combat using the characters' "Persona" abilities against hostiles known as Shadows. Development on the game began after Atlus's success with collaborating with an external developer on the 2012 fighting game Persona 4 Arena. It was based on the wish to create a collaborative spin-off with the Etrian Odyssey development team and fan demands for a Persona game on the 3DS. The Persona Q development team was made up of staff from both Etrian Odyssey IV and the main Persona series. Series character designer Shigenori Soejima created the cast's new deformed "chibi" appearances, while the music was composed by Atsushi Kitajoh and Toshiki Konishi with supervision by series composer Shoji Meguro. First announced in 2013 alongside the console port of Persona 4 Arena Ultimax, Persona 4 and Persona 5, it was the first Persona game to be developed for a Nintendo platform. It released to strong sales and positive reviews from critics, with several enjoying the game's comedic writing, presentation, and blend between Persona and Etrian Odyssey's gameplay styles. A sequel, Persona Q2, was released for the 3DS in Japan in November 2018 and worldwide in June 2019.
  • 1.1K
  • 24 Oct 2022
Topic Review
Matrix Function
In mathematics, a matrix function is a function which maps a matrix to another matrix.
  • 364
  • 24 Oct 2022
Topic Review
Cornerstone
Cornerstone is a relational database for MS-DOS released by Infocom, a company best known in the 1980s for developing interactive fiction video games. Initially hailed upon release in 1985 for its ease of use, a series of shortcomings and changes in the market kept for Cornerstone from achieving success. It is generally considered a key factor in Infocom's demise.
  • 299
  • 24 Oct 2022
Topic Review
Agrippa (A Book of the Dead)
Agrippa (A Book of the Dead) is a work of art created by science fiction novelist William Gibson, artist Dennis Ashbaugh and publisher Kevin Begos Jr. in 1992. The work consists of a 300-line semi-autobiographical electronic poem by Gibson, embedded in an artist's book by Ashbaugh. Gibson's text focused on the ethereal, human-owed nature of memories retained over the passage of time (the title referred to a Kodak photo album from which the text's memories are taken). Its principal notoriety arose from the fact that the poem, stored on a 3.5" floppy disk, was programmed to encrypt itself after a single use; similarly, the pages of the artist's book were treated with photosensitive chemicals, effecting the gradual fading of the words and images from the book's first exposure to light.
  • 559
  • 24 Oct 2022
Topic Review
Medical Software
Medical software is any software item or system used within a medical context, such as:reducing the paperwork, tracking patient activity standalone software used for diagnostic or therapeutic purposes; software embedded in a medical device (often referred to as "medical device software"); software that drives a medical device or determines how it is used; software that acts as an accessory to a medical device; software used in the design, production, and testing of a medical device; or software that provides quality control management of a medical device.
  • 597
  • 24 Oct 2022
Topic Review
Apache Wave
Apache Wave was a software framework for real-time collaborative editing online. Google originally developed it as Google Wave. It was announced at the Google I/O conference on May 27, 2009. Wave is a web-based computing platform and communications protocol designed to merge key features of communications media such as email, instant messaging, wikis, and social networking. Communications using the system can be synchronous or asynchronous. Software extensions provide contextual spelling and grammar checking, automated language translation and other features. Initially released only to developers, a preview release of Google Wave was extended to 100,000 users in September 2009, each allowed to invite additional users. Google accepted most requests submitted starting November 29, 2009, soon after the September extended release of the technical preview. On May 19, 2010, it was released to the general public. On August 4, 2010, Google announced the suspension of stand-alone Wave development and the intent of maintaining the web site at least for the remainder of the year, and on November 22, 2011, announced that existing Waves would become read-only in January 2012 and all Waves would be deleted in April 2012. Development was handed over to the Apache Software Foundation which started to develop a server-based product called Wave in a Box. It was retired in January 2018.
  • 652
  • 24 Oct 2022
Topic Review
Bomb-Making Instructions on the Internet
The availability of bomb-making instruction on the Internet has been a cause célèbre amongst lawmakers and politicians anxious to curb the Internet frontier by censoring certain types of information deemed "dangerous" which is available online. "Simple" examples of explosives created from cheap, readily available ingredients are given. The Federal Bureau of Investigation reports that there were 1,699 criminal bombings in 1989 and 3,163 in 1994.
  • 1.7K
  • 24 Oct 2022
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