This paper deals with the optical recognition of text data in documents such as engineering drawings, land-use and land-register maps, and utility maps. The automatic computer acquisition of these documents is performed through the basic steps of vectorization of the line-structure and recognition of the text data interspersed in the document. The latter data are usually handwritten by professional draftsmen, and may have any size, position, and orientation. We review some of the features appropriate to this particular OCR problem, and suggest a special recognition strategy. Numerous examples are given. The results obtained with a prototype system on actual land-register maps are reported.

Vectorization (mathematics)

Position (finance)

Optical character recognition

Line (geometry)

Document processing

10.1147/rd.363.0487

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Citations (16)

Elastic Scattering and Total Cross-Section in p+p Reactions : As Measured by the LHC Experiment TOTEM at √ =7 TeV(Forward and Diffraction Physics and Cosmic Rays,Multiparticle Dynamics)

Progress of Theoretical Physics Supplement (2012)

G. Antchev P. Aspell I. Atanassov V. Avati J. Baechler

Source

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THE JUNE 2008 FLARE OF MARKARIAN 421 FROM OPTICAL TO TeV ENERGIES

The Astrophysical Journal (2008)

I. Donnarumma V. Vittorini S. Vercellone E. Del Monte M. Feroci

We present optical, X-ray, high energy ($\lessapprox 30$ GeV) and very high energy ($\gtrapprox 100$ GeV; VHE) observations of the high-frequency peaked blazar Mrk 421 taken between 2008 May 24 and June 23. A high energy $\gamma$-ray signal was detected by AGILE with \sqrt{TS}=4.5 on June 9--15, with $F(E>100 \mathrm{MeV})= 42^{+14}_{-12}\times 10^{-8}$ photons cm$^{-2}$ s$^{-1}$. This flaring state is brighter than the average flux observed by EGRET by a factor of $\sim$3, but still consistent with the highest EGRET flux. In hard X-rays (20-60 keV) SuperAGILE resolved a 5-day flare (June 9-15) peaking at $\sim$ 55 mCrab. SuperAGILE, RXTE/ASM and Swift/BAT data show a correlated flaring structure between soft and hard X-rays. Hints of the same flaring behavior are also detected in the simultaneous optical data provided by the GASP-WEBT. A Swift/XRT observation near the flaring maximum revealed the highest 2-10 keV flux ever observed from this source, of 2.6 $\times 10^{-9}$ erg cm$^{-2}$ s$^{-1}$ (i.e. > 100 mCrab). A peak synchrotron energy of $\sim$3 keV was derived, higher than typical values of $\sim$0.5-1 keV. VHE observations with MAGIC and VERITAS on June 6-8 show the flux peaking in a bright state, well correlated with the X-rays. This extraordinary set of simultaneous data, covering a twelve-decade spectral range, allowed for a deep analysis of the spectral energy distribution as well as of correlated light curves. The $\gamma$-ray flare can be interpreted within the framework of the synchrotron self-Compton model in terms of a rapid acceleration of leptons in the jet.

Flare

Spectral energy distribution

10.1088/0004-637x/691/1/l13

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Citations (100)

Energy-pooling ionization via an autoionizing state in indium

Physical Review A (1990)

P. Bicchi A. Kopystyńska M. Meucci L. Moi

Energy-transfer collisions between two 6 $^{2}$${\mathit{S}}_{1/2}$ laser-excited indium atoms leading either to ionization of one of the colliding atoms or to population of its ${\mathit{n}}^{2}$P Rydberg states, have been studied. Atomic lines corresponding to the 5s5${\mathit{p}}^{2}$ $^{2}$D\ensuremath{\rightarrow}5${\mathit{s}}^{2}$6p $^{2}$${\mathit{P}}_{1/2,3/2}$ interconfiguration transitions have been recorded as evidence of the energy-pooling ionization via an autoionizing state. Atomic lines corresponding to the ${\mathit{n}}^{2}$P\ensuremath{\rightarrow}6 $^{2}$S transitions for n=9, 10, and 11 as well as to the 5 $^{2}$D\ensuremath{\rightarrow}5 $^{2}$P transitions have proven that the population of highly excited indium atomic states is through the energy-poolimg collisions.

Autoionization

10.1103/physreva.41.5257

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Citations (22)

Light-Induced Atom Desorption

EPL (Europhysics Letters) (1994)

M. Meucci E. Mariotti P. Bicchi C. Marinelli L. Moi

In the present paper we report experimental evidence of a new effect, observed for the first time by Gozzini et al. on sodium vapour, in which an important rubidium vapour density increase (larger than one order of magnitude) is observed when silane-coated cells are shined by non-resonant and weak light. The effect is due to non-thermal light-induced atom desorption. A preliminary analysis of its dependence on the light power density and on the wavelength has been carried out.

Rubidium

Power density

Vapour density

Thermal desorption

10.1209/0295-5075/25/9/001

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Citations (93)

Measurement of silver vapor density by an optical method

The European Physical Journal A (1974)

M. Meucci P. Minguzzi E. Ansuini

Vapour density

Line (geometry)

Optical density

10.1007/bf01677939

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Citations (1)

An investigation of the long-range interatomic potential Na-Kr by observing broadening and shift on the NaD 1 line

Lettere al nuovo cimento della societa italiana di fisica/Lettere al nuovo cimento (1976)

N. Ioli M. Meucci

Line (geometry)

10.1007/bf02746940

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Citations (0)

Diffraction at TOTEM

G. Antchev M. Berretti M. Bozzo J. Heino E. Radicioni

Totem

10.3204/desy-proc-2009-02/20

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Development of colour centre lasers for spectroscopy applications

Revue de Physique Appliquée (1983)

G. Baldacchini G.P. Gallerano D. Censi M. Tonelli P. Violino

On présente la description de deux lasers à centres colorés mis au point par nous-mêmes.Les détails techniques des solutions sont donnés surtout au regard de la formation des centres FA(II) dans les cristaux de KCl : Li.Les propriétés de fluorescence de ces centres sont examinées brièvement et l'on présente un exemple d'application à la spectroscopie moléculaire.Abstract.2014 The description of two home-built colour centre lasers is presented.Technical details of the solutions are given with special concern to the production of the FA(II) centres in KCl : Li crystals.The fluorescence properties of these centres are briefly investigated and an example of application to molecular spectroscopy is shown.

10.1051/rphysap:01983001805030100

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Citations (14)

Light-induced diffusion and desorption of alkali metals in a siloxane film: Theory and experiment

Physical Review A (1999)

S. N. Atutov V. Biancalana P. Bicchi C. Marinelli E. Mariotti

The light-induced desorption and diffusion of alkali-metal atoms in organic films are interesting fields of investigation. An impressive demonstration is given by the recently observed light-induced atomic desorption (LIAD) effect, where a huge alkali-metal atom desorption from siloxane films, previously exposed to atomic vapors, is induced by weak and nonresonant light. In this paper, experimental data and a one-dimensional theoretical model of the effect are presented. The model gives a good description of the vapor density dynamics by taking into account both the atomic diffusion inside the coating and the surface desorption. General equations are reported and discussed within the limits of experimental interest. The potential barrier at the vapor-surface interface and the activation energy for Rb in (poly)dimethylsiloxane have been determined.

Siloxane

Atomic diffusion

10.1103/physreva.60.4693

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Citations (74)