Patent US8059168 - System and method for scene change triggering

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SYSTEM AND METHOD FOR SCENE 5,216,595 A 6/1993 Protheroe CHANGE TRIGGERING 5,239,165 A 8/1993 Novak 5,258,605 A 11/1993 Metlitsky et al. Inventor: Alexis J. Cournoyer, Portsmouth, RI 2 53;; (US) 5,417,424 A 5/1995 Sh0weIeh et 01. 5,452,379 A 9/1995 Poor Assignee: GTech Corporation, Providence, RI 5,673,125 A 9/ 1997 MefeC1<ieta1~ (US) (Continued) Notice: Subject to any disclaimer, the term of this FOREIGN PATENT DOCUMENTS patent is extended or adjusted under 35 EP 1 172 756 Al 1/2002 U.S.C. l54(b) by 500 days. _ (Cont1nued) Appl. No.: 12/234,992 OTHER PUBLICATIONS Filed: sep‘ 22’ 2008 International Search Report and Written Opinion dated May 19, Prior Publication Data 2010, International Application No. PCT/US2009/057610. Us 2009/0015697 A1 Jan. 15, 2009 (Continued) Related U_s_ Application Data Primary Examiner * Gevell Selby 74 Att ,A t, F' *MCrt &E l'h,LLP; Continuation-in-part of application No. 11/376,052, §<ia)L Fzzfliyan gEeSnq Or Wm C a er ng ls filed on Mar. 14, 2006, noW Pat. No. 7,920,299. ' ’ ' Provisional application No. 60/661,698, filed on Mar. (57) ABSTRACT 147 2005' A triggering system and process for a form reader is shoWn Int Cl using a histogram of the optical scene. The form reader is ' ' open on three sides With a camera facing a platen on to Which H04N 9/68 (200601) a form is placed. The camera converts the light rays reflected U_‘s‘ Cl‘ """ "_' """ "_ 348/234; 348/20814; 348/222:1 from the platen into a video stream that is sent to a processor. Fleld of Classlficatlon Search ----------- ~~ 348/208-147 A change in content of a first light intensity level contrasted to _ _ 348/2221, 234; 358/471 the content of a second light intensity level is used to deterSee aPP11CaI1On file for Complete Search h1SIOI'Y- mine When the form enters the scene. Illustratively, the first _ light intensity level represents black levels and the second References Clted light intensity levels represent White levels. A threshold is pre-deterrnined that isolates the first light intensity content, US‘ PATENT DQCUMENTS and When the first light intensity content remains constant 4,141,036 A 2/1979 Dlehl (after the presence of a form) the form is deemed to be still 2 gilatrtlgneznaiil Wherein the system may then read the information on the 437363109 A 4/1988 Dvorzsak form 4,760,247 A 7/1988 Keane et al. 5,039,847 A 8/1991 Morii et al. 12 Claims, 2 Drawing Sheets 39\k CAMERA CAMERA __40 ELECTRONICS IVIDEO’\42 PROCESSOR (DSP) “41 I/O: DISPLAYS “T34 BUTTONS SCENE COMMUNICATIONS 22 PRINTER MEMORY: IMAGE BUFFERS CENTRAL OPER. SYSTEM CONTROLLER CACHE I FLASH ~36 MEIVIORY

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* cited by examiner

U.S. Patent Nov. 15,2011 Sheet 1 012 US 8,059,168 B2

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U.S. Patent

Nov. 15, 2011

\-E CAMERA

SCENE

Sheet 2 of2 US 8,059,168 B2
; VCAMERA ?
ELECTRONICS 40
WDEO“42
PROCESSOR(DSP)'“4I
I/O: DISPLAYS ‘""-“W34
BUTTONS NETWORK
COMMUNICATIONS
PRINTER ,
MEMORM
IMAGE ~ ~
BUFFERS CENTRAL
OPER SYSTEM CONTROLLER
FLASFI 36

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System and method for scene change triggering