WO1999056238A1 - Dispositif et procede de conversion d'un deplacement sur une surface sensible en un code binaire - Google Patents

Dispositif et procede de conversion d'un deplacement sur une surface sensible en un code binaire Download PDF

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Publication number
WO1999056238A1
WO1999056238A1 PCT/NL1999/000254 NL9900254W WO9956238A1 WO 1999056238 A1 WO1999056238 A1 WO 1999056238A1 NL 9900254 W NL9900254 W NL 9900254W WO 9956238 A1 WO9956238 A1 WO 9956238A1
Authority
WO
WIPO (PCT)
Prior art keywords
code
zones
zone
displacement
sequence
Prior art date
Application number
PCT/NL1999/000254
Other languages
English (en)
Inventor
Yevgeniy Pavlovich Kuzmin
Original Assignee
Forsythe It B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Forsythe It B.V. filed Critical Forsythe It B.V.
Priority to AU35402/99A priority Critical patent/AU3540299A/en
Publication of WO1999056238A1 publication Critical patent/WO1999056238A1/fr

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition
    • G06V10/17—Image acquisition using hand-held instruments

Definitions

  • the invention relates to a device as defined in the preamble of claim 1 and a method as defined in claim 7.
  • the invention aims to eliminate these disadvantages. This aim is obtained according to the invention with the measures as described in the characterizing part of claim 1.
  • the sensitive surface is divided into a limited number of different sensitive zones and the means for generating the code which represent the displacement needs only to take into account the code of the firstly activated zone and the direction which is taken thereafter.
  • the advantages of the device, particularly the writepad, according to the invention are many One uses with it the natural character shapes and the intuitive way in which the user will write them. Nearly all international characters and symbols can be represented. The accuracy, even with a limited number of zones, is great and even when the user writes the characters with a trembling hand they will be coded unambiguously and will be outputted and represented as normally written characters. This makes the device according to the invention very suitable to be used by children, sick and disabled people. 3
  • the recognition speed is high; practically directly after a character has been written it can be processed or displayed.
  • Figure 1 show a block diagram of a device according to the invention.
  • Figures 2a-c show the coding of characters.
  • Figure 3 shows an amended design of the surface to be written.
  • Figure 4 shows a preferred embodiment of characters which can be written.
  • Figure 5 to 7 show other divisions of the surface to be written.
  • Figure 8 shows in perspective a hand-held telephone with the device according to the invention used therein.
  • reference 2 denotes a surface which can be called generally a "main surface” and which is subdivided into a number - here four - zones which are numbered, counter-clockwise 4a-4b-4c-4d.
  • zones are the ones which are identified in the claims as zones which "can be activated and are characterized by identification 4 codes" with which is meant to say that, when such a zone is activated (which can be done in many different ways) a signal which characterizes this activation is generated.
  • the zones can, for instance, be touch-sensitive zones such as the one used in the commonly known alpha-numerical keyboards in calculating machines, telephone sets and such. However they can also be zones which are sensitive for the proximity of a certain object, for instance the fingertip, the end of a pen, etcetera, or zones which are sensitive for irridiation, for instance with light.
  • each of these zones is provided with an output, schematically denoted, 6a-6d.
  • the shown embodiment is such that, when one of the zones 4a-4d is activated, its output 6a-6d changes state, for instance goes from a logic "low” level to a logic “high” level, or opposite.
  • Such a technique is commonly known, as well as the way in which such zones cooperate with an evaluation circuit 8 in which the fact that one of the zones is actuated is translated into a digital code.
  • the invention has chosen a set-up in which the activation of the zones is coded as follows : activated 4a-code : 01 activated 4b-code : 00 activated 4c-code : 10 activated 4d-code : 11.
  • a subsequent activation of the respective zones is not coded by sequentially generating each of the individual codes but by outputting the code of the firstly activated zone followed by a code which indicates whether or not a displacement of the one zone to the other occurs, in this case, in a vertical or in a horizontal direction.
  • a code which indicates whether or not a displacement of the one zone to the other occurs, in this case, in a vertical or in a horizontal direction.
  • the invention is not limited 5 to such a code and also not limited to coding only displacements in vertical or horizontal direction.
  • a displacement over the surface 2 will be represented by a sequence of displacements of one zone (activated) to an adjacent one and coded solely by a code which is obtained by using the code of the firstly activated zone followed by simple bits which indicate the direction of displacement.
  • This code is generated in the coding device 10; this coding device 10 receives the individual zone codes, generated in the evaluation circuit 8 and converts these into a code which is composed in the herein above indicated way.
  • Figures 2a-2c explain this procedure.
  • Figure 2a shows how in the device according to the invention the writing of the letter "a" is coded.
  • the subsequent displacement occurs from 4b to 4c, thus in vertical direction, which is characterized by a "0" while the displacement from the zone 4c to the zone 4d again is in a horizontal direction, characterized by "1".
  • the upgoing trace of the letter "a”, which goes from zone 4d to zone 4a is a displacement in vertical direction characterized by a "0" while finally the last downgoing trace, going from 4a to 4d, also is a displacement in vertical direction characterized by a "0".
  • the letter "c" is, as figure 2b shows, represented by a simple code: starting in zone 4a with as code 01 there is firstly a displacement in horizontal direction (to zone 4b) , in vertical direction (from 4b to 4c) , and again in horizontal direction (from 4c to 4d) .
  • the code will be 01101.
  • Figure 2c shows how in the shown device the code for the letter "y” is realized: starting in the zone 4b, characterized by "00" there is a horizontal displacement ("1"), a vertical displacement ("0") and again a vertical displacement ("1") .
  • the code will be 00101.
  • This final code is obtained on the output 14 and can either be supplied to converter 16 which for instance comprises a conversion table converting the code 7 in the commonly known ASCII code or into any other known code, or can be supplied to a control circuit 18 for a digital display 20 on which the strokes or shapes which are generated by the movements over the surface 2 can be displayed.
  • each stroke-code is supplemented with bit "1" to the left side.
  • a static code for "j" is “10101” and for "y” is "100101”.
  • static codes are considered as entries for a static conversion table. Necessary then is a table with 256 entries for stroke-codes described above, because the maximal dynamic code length is 7 and static code length is
  • the output code is obtained as a contents of corresponding memory cell.
  • the converter is preferably implemented as a binary tree. Nodes of this tree contain output symbols or are empty. Each node has two branches. Left branches of this tree correspond to a "0" and right ones correspond to a "1" in stroke-codes .
  • the movement is from the tree root, each time selecting a corresponding branch for the next bit, until the end of the stroke-code.
  • the current node contains the output code .
  • a binary tree implementation of the converter is more space efficient, but requires several accesses to the tree during the code conversion.
  • a table implementation is less space efficient, but the output code is obtained just after one access. 8
  • Figures 1 and 2a-c show at the crossing point of the boundary of the zones a tactile marker 7.
  • This marker can be a slight elevation, protruding from the sensitive surface, forcing the user to "write around” it.
  • Figure 3 shows a sensitive surface 30 made up from six individually to be activated sensitive zones 32a-32f .
  • Horizontal transitions are sufficiently defined: when a horizontal displacement is characterized by, for instance, the bit "0" the trace from for instance zone 32a to zone 32b running in the direction of the arrow 34 is defined unambiguously by the bitsequence 0000.
  • Displacements in vertical direction however which start from one of the two middle zones 32c or 32d must be characterized by two bits, and thus for instance by the bitsequence 11 or the bitsequence 10. So a trace from zone 32c to zone 32b will be coded 01011 and a trace from zone 32d to zone 32e by OHIO.
  • the total code of a trace which covers the zone and which, for instance, makes up a character will be very much shorter than when using the conventional codings.
  • the shape of the total surface and the shapes of the respective zones to be activated can, of course, deviate from the rectangular shape as shown in the drawings .
  • the configuration according to figure 5 shows a sensitive surface, in its whole denoted with reference numeral 40 and made up by 18 zones 42a-421.
  • a 4 -bit code is thus sufficient to characterize each of the zones 42a-42l and provides sufficient room to characterize movements from one zone to the other.
  • Figure 6 shows a surface 50 with four zones 52a-52d with in the middle part a free space 54 which can be used as a display to display direct readable or coded messages.
  • Figure 7 shows a configuration in which the sensitive surface 60 is ring-shaped and comprises the ring segments (zones) 601-60i) with which simplified characters can be coded, however with more restrictions than with the firstly described embodiment but with the advantage that there results a central surface 64 which can be used as display to show messages or parts of messages .
  • Figure 8 shows how the writepad according to the invention can be implemented in a hand-held GSM telephone 10
  • the sensitive writepad surface 88 with the six zones 90a-90f is placed on the inside of the cover.
  • the tactile markers 92a, 92b are provide.
  • the text "written" in individual characters on the writepad 88 appears on the display 82.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Character Discrimination (AREA)

Abstract

L'invention concerne un dispositif simple et bon marché permettant de convertir un déplacement sur une surface en un code binaire. Cette surface est, à cet effet, divisée en un certain nombre de zones distinctes adjacentes, dont chacune émet un signal d'identification distinct. Ces signaux sont envoyés à un dispositif d'évaluation et le dispositif de codage dérivé de la séquence de la zone respective signale le sens de déplacement et identifie chaque sens grâce à un code binaire. Ainsi se forme la surface de code ultime à partir du code représentant la première zone activée suivi d'une séquence d'unités de code qui chacune représente un déplacement dans un sens prédéterminé.
PCT/NL1999/000254 1998-04-29 1999-04-28 Dispositif et procede de conversion d'un deplacement sur une surface sensible en un code binaire WO1999056238A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU35402/99A AU3540299A (en) 1998-04-29 1999-04-28 Device and method for converting a displacement over a sensitive surface into a binary code

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1009035A NL1009035C2 (nl) 1998-04-29 1998-04-29 Werkwijze voor het coderen van een verplaatsing over een in discrete zones verdeeld oppervlak en inrichting voor het in een binaire code omzetten van een dergelijke verplaatsing.
NL1009035 1998-04-29

Publications (1)

Publication Number Publication Date
WO1999056238A1 true WO1999056238A1 (fr) 1999-11-04

Family

ID=19767052

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1999/000254 WO1999056238A1 (fr) 1998-04-29 1999-04-28 Dispositif et procede de conversion d'un deplacement sur une surface sensible en un code binaire

Country Status (3)

Country Link
AU (1) AU3540299A (fr)
NL (1) NL1009035C2 (fr)
WO (1) WO1999056238A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1483470A1 (fr) * 2002-03-05 2004-12-08 KIM, Jong-O Appareil d'ouverture/fermeture de porte
WO2005043451A2 (fr) * 2003-08-05 2005-05-12 Pedersen Steinar Systeme d'identification d'une personne
US7519748B2 (en) 2004-06-18 2009-04-14 Microth, Inc. Stroke-based data entry device, system, and method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909785A (en) * 1973-11-12 1975-09-30 Amperex Electronic Corp Apparatus for recognizing hand printed characters
EP0471257A2 (fr) * 1990-08-03 1992-02-19 Interfax, Inc. Système et méthode de reconnaissance de caractères manuscrits avec contrainte par points

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909785A (en) * 1973-11-12 1975-09-30 Amperex Electronic Corp Apparatus for recognizing hand printed characters
EP0471257A2 (fr) * 1990-08-03 1992-02-19 Interfax, Inc. Système et méthode de reconnaissance de caractères manuscrits avec contrainte par points

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ROLF ZIMMERMANN: "Dynamische Beschreibung von Zeichenschriebweisen und ihre ausnutzung zur Erkennung von Handschriftzeichen", NACHRICHTENTECHNISCHE ZEITSCHRIFT, vol. 12, 1972, pages 542 - 544, XP002085851 *
T. L. DIAMOND: "Reading Handwritten Characters", BELL LABORATORIES RECORD, vol. 36, no. 1, January 1958 (1958-01-01), pages 34 - 35, XP002107444 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1483470A1 (fr) * 2002-03-05 2004-12-08 KIM, Jong-O Appareil d'ouverture/fermeture de porte
EP1483470A4 (fr) * 2002-03-05 2006-06-07 Kim Jong O Appareil d'ouverture/fermeture de porte
WO2005043451A2 (fr) * 2003-08-05 2005-05-12 Pedersen Steinar Systeme d'identification d'une personne
WO2005043451A3 (fr) * 2003-08-05 2006-03-23 Pedersen Steinar Systeme d'identification d'une personne
US7519748B2 (en) 2004-06-18 2009-04-14 Microth, Inc. Stroke-based data entry device, system, and method

Also Published As

Publication number Publication date
AU3540299A (en) 1999-11-16
NL1009035C2 (nl) 1999-11-01

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