An implementation on FPGA for a time base corrector

The main motivation of this work arose while working on video restoration with old and valuable playback systems but with misalignment between record and playback heads. Brand new systems include systems like the one shown here. This solution aims to solve in a practical and cheap way problems in old but still usable VCR systems to be used as a source for digital restoration. Hereafter an implementation over FPGA of a well documented solution for the digital time base distortion that usually affects magnetic tape recorders for audio and video is presented. A brief explanation about the blocks involved is given as well as a further discussion about the ideas considered to implement the overall design.Eje: Arquitectura, redes y sistemas operativosRed de Universidades con Carreras en Informática (RedUNCI

Arizona Dream: Maxime Rossi Meets Max Ernst

abstract: This essay analyses the 22:40 minute video Real Estate Astrology (2015) of Maxime Rossi (born in 1980), a contemporary artist's response to the life and work of the German born surrealist Max Ernst. Rossi sets out in this vide, produced in the color filter technique of anaglyph projection, to search for Ernst’s traces in Sedona, Arizona. The surrealist artist lived here in exile together with his wife, the American painter Dorothea Tanning, from 1946 to 1953. Maxime Rossi shows a predilection for historical artists, whose works he uses as a point of departure in his work, in which historical facts and fiction are inextricably overlapping. In Sedona, Rossi goes to the places Max Ernst is said by locals Rossi has met several times to have visited: a hut where the surrealist is said to have spent the night from time to time, a stick that is said to have belonged to him, a cave with prehistoric mural paintings that he is said to have seen. Eventually, Ernst’s horoscope is said to have predestined a particularly fertile time for him in Arizona. But as we will see, all the tracks prove to be intentionally misplaced traces that confront the viewer with a hallucinatory world that mixes the real with the unreal, historical facts with the fictitious. What ultimately results is a hybrid whole that incorporates different sources and materials and oscillates between the banal and the fantastical, and between fiction and reality. And in doing so, he follows surrealist esthetics and strategies of alienation as we find them especially in Ernst’s collage works. A trans-epochal dialogue between the historical conditions of Ernst’s exile on the one hand, and the actual present on the other, runs through Real Estate Astrology, giving us two periods within the unit of the video

Data display programming

Computer programming for control of complex data processing operations involved in analysis and interpretation of large volumes of sensor data from scientific satellite

Multiparameter vision testing apparatus

Compact vision testing apparatus is described for testing a large number of physiological characteristics of the eyes and visual system of a human subject. The head of the subject is inserted into a viewing port at one end of a light-tight housing containing various optical assemblies. Visual acuity and other refractive characteristics and ocular muscle balance characteristics of the eyes of the subject are tested by means of a retractable phoroptor assembly carried near the viewing port and a film cassette unit carried in the rearward portion of the housing (the latter selectively providing a variety of different visual targets which are viewed through the optical system of the phoroptor assembly). The visual dark adaptation characteristics and absolute brightness threshold of the subject are tested by means of a projector assembly which selectively projects one or both of a variable intensity fixation target and a variable intensity adaptation test field onto a viewing screen located near the top of the housing

Video games are exciting: a European study of videogame‐induced seizures and epilepsy.

Epileptic Disord. 2002 Jun;4(2):121-8. Video games are exciting: a European study of video game-induced seizures and epilepsy. Kasteleijn-Nolst Trenité DG, Martins da Silva A, Ricci S, Rubboli G, Tassinari CA, Lopes J, Bettencourt M, Oosting J, Segers JP. Department of Neurology, Medical Centre Alkmaar, PO Box 501, 1800 AM, The Netherlands. [email protected] Abstract BACKGROUND: Video game seizures have been reported in photosensitive and non-photosensitive patients with epilepsy. The game Super Mario World, has led to many cases of first seizures. We examined whether this game was indeed more provocative than other programs and whether playing the game added to this effect. METHODS: We prospectively investigated 352 patients in four European cities, using a standard protocol including testing of a variety of visual stimuli. We correlated historical data on provocative factors in daily life with electroencephalographic laboratory findings. RESULTS: The video game, Super Mario World proved more epileptogenic than standard TV programs and as provocative as programs with flashing lights and patterns. Most striking was the fact that video game-viewing and-playing on the 50 and 100 Hz TV was significantly more provocative than viewing the standard program (P < 0.001, P < 0.05 respectively). Playing the video game Mario World on a 50 Hz TV, appeared to be significantly more provocative than playing this game on the 100 Hz TV (P < 0.001). Of 163 patients with a history of TV-, VG- or CG-seizures, 85% of them showed epileptiform discharges in response to photic stimulation, 44% to patterns, 59% to 50 Hz TV and 29% to 100 Hz TV. CONCLUSIONS: Children and adolescents with a history of video game seizures are, in the vast majority, photosensitive and should be investigated with standardised photic stimulation. Games and programs with bright background or flashing images are specifically provocative. Playing a video game on a 100 Hz TV is less provocative [published with videosequences]. PMID: 12105074 [PubMed - indexed for MEDLINE

Study of time-lapse processing for dynamic hydrologic conditions

The usefulness of dynamic display techniques in exploiting the repetitive nature of ERTS imagery was investigated. A specially designed Electronic Satellite Image Analysis Console (ESIAC) was developed and employed to process data for seven ERTS principal investigators studying dynamic hydrological conditions for diverse applications. These applications include measurement of snowfield extent and sediment plumes from estuary discharge, Playa Lake inventory, and monitoring of phreatophyte and other vegetation changes. The ESIAC provides facilities for storing registered image sequences in a magnetic video disc memory for subsequent recall, enhancement, and animated display in monochrome or color. The most unique feature of the system is the capability to time lapse the imagery and analytic displays of the imagery. Data products included quantitative measurements of distances and areas, binary thematic maps based on monospectral or multispectral decisions, radiance profiles, and movie loops. Applications of animation for uses other than creating time-lapse sequences are identified. Input to the ESIAC can be either digital or via photographic transparencies