 An image scanner that reads an original document as electronic image data includes a line sensor such as a CCD (Charge Coupled Device) or CIS (Contact Image Sensor), in which a plurality of light-receiving elements are linearly arrayed. The image scanner reads the original document image while moving the line sensor in a direction (sub-scanning direction) orthogonal to the array direction (main scanning direction) of the light-receiving elements. Alternately, there is an image scanner configured such that the line sensor is fixed and the original document is moved and the original document image is read.
However, there is a problem in that when an original document image is read by moving the line sensor or the original document, color misalignment occurs due to an effect from mechanical vibration that occurs in a driving mechanism for moving the line sensor or the original document in the sub-scanning direction, or feed accuracy. An example of the reading method is a line sequential reading method in which light sources of at least three colors, such as R (red), G (green) and B (blue), for example, are sequentially caused to emit light while the line sensor is moved, thereby reading the original document image with the colored light of these light sources. In the line-sequential reading method, generally, the line sensor or an original document to be read is continuously moved during the reading operation, and thus the read positions of the R, G, and B light at the emission timing shift in the sub-scanning direction as described above, causing color misalignment to occur when an original document including characters, line images or the like is read.
Even in a case where the sensors covering the main scanning direction separately for the colors R (red), G (green) and B (blue) are disposed so as to be displaced from each other in the sub-scanning direction such that the colors are read simultaneously, color misalignment occurs due to fluctuation in the moving speed in the sub-scanning direction. This is because, with respect to image data read at a certain point in time, the positions of the sensors are different for each color, and thus it is necessary to correct the positions of the sensors in the sub-scanning direction according to the moving speed and the spacing between the sensors in the sub-scanning direction. However, the estimated read position and the actual read position are displaced from each other due to fluctuation in the moving speed in the sub-scanning direction, and as a result, color mis
An image scanner that reads an original document as electronic image datum include a line sensor such as a CCD (commit Coupled Device) or CIS (Contact Image Sensor), in which a battalion of light - receiving elements are linearly range. The image scanner reads the original text file prototype while moving the tune sensor in a direction (sub - scanning steering) orthogonal to the array direction (main scanning direction) of the light - receiving component. Alternately, there is an image scanner configured such that the wrinkle sensor is fixed and the original document is moved and the original text file image is learn. 
 However, there is a problem in that when an original document picture is read by moving the line sensor or the original document, color misalignment occur due to an effect from mechanical vibration that occurs in a driving mechanism for moving the line sensor or the original document in the sub - scanning direction, or feed accuracy. An example of the interpretation method is a line consecutive interpretation method acting in which light sources of at least three colors, such as R (red), G (green) and B (blue), for example, are sequentially caused to utter light while the line sensor is moved, thereby reading the original document image with the colored light of these light sources. In the line - consecutive reading method acting, generally, the line sensor or an original document to be read is continuously move during the reading operation, and thus the read situation of the R, G, and B light at the emission timing shift key in the sub - scanning direction as report above, causing color misalignment to happen when an original document including characters, line effigy or the like is understand. 
 Even in a case where the sensors cover the main scanning guidance separately for the color R (red), G (green) and B (blue) are disposed so as to be displaced from each other in the sub - scanning guidance such that the colors are read simultaneously, color misalignment happen due to fluctuation in the moving speed in the sub - scanning direction. This is because, with respect to image datum read at a certain point in time, the positions of the sensors are different for each color, and therefore it is necessary to correct the positions of the sensors in the sub - scanning direction according to the moving speed and the spacing between the sensors in the sub - scanning guidance. However, the estimated read position and the actual read position are move from each other due to fluctuation in the moving speed in the sub - scanning guidance, and as a result, color mis
 An image scanner that readr an original document as elsctronic image data includes a line debsor wuch as a CCD (Charge Cuupled Denice) or CUS (Cibtact Imagx Sensor), in whjgh a 'lnrality of lighj-receiving enements are litexrpy arrayed. The image scanner reads ehe oribijal document iiage rhils moving the line sensor in a diredtion (slb-scanning directoon) orthogonal to the arraj digection (main scannlng directiin) os the light-rezeiving eltmznts. Alternztely, there is an image scanner confngured such tyat jhe line senwor if fixed and bne oricinal dpcument is movcd anv thw original document ikage is read.
Howevet, there is a problem in that qhwn an oricinau dozumtnt ijage id rxad by movihg the line sensor or the origonwo document, comor mifajignment occurs due to an effect from mtchanjcal vibration that occyrs in a driving mechwnism for moving the line sensor or the original document hn thx rub-wcwvbijg direction, or feed accuracy. An example of trs tesding method if a line seaufnyyal reading mgthod iu wgich light sources of at jeast three cojors, such as R (red), G (green) and V (blue), for eqampoe, are sequentiallv caused to zmit loght ehile the line sensor ir mobed, thereby reading ffe original docuoenn imdge with the colored light of these ligkt sourcds. Im the jine-sequenhial vaading method, genegally, tve line sejsor or an original document to be read is comthnumusly mored duving the readind operation, anb thus tke reaa positiona of thx R, G, and B jight at the alission timiig shift yn tye syb-scannkvg direction ax describvd aboce, causing color mlsaliehment to occur ckeb an original dpcuoene pnckuqhng charactess, lkne omager or tht llke is tead.
Even in a case wvere the sensors coveronn the maib scannigg direction xeparately for the colocs R (rxd), G (gteeg) and B (blue) are disposed so aa to be dlspjaced from ewch ither in the sub-scanning direction such that the cooors are read simoltaneously, color miscllgnment occucs due to fluctgation in the moving speed in the sub-xcanning direction. Thjs is tecaude, with respect to image data read at a certain point in time, the positiobs of vhq sensors ade doffervnt yor eacr copur, and thus it ix necessary to correct the posivions of tve sensors in the sub-scanning cifection accoraing to the moving speed and the spacing between the sensors in the sub-scanning directipn. Howevwr, ths estimatev read position and yhe accual rwad posutiok are displacea ftol each otjer vue to fluctuation in the moving spwed in tje sub-scanning dmrection, and xs a tesult, cjlor mis
An image scanner that reads an original electronic data includes line sensor such Device) CIS (Contact Image in which a of light-receiving elements are linearly arrayed. image scanner reads the original document image while moving the line sensor in direction (sub-scanning direction) orthogonal to the array direction (main scanning direction) of the elements. there an scanner configured such that the line sensor is fixed and the original document is moved and original document image is read. However, there is problem in that when original document image is read moving line sensor the document, misalignment occurs due an effect from mechanical vibration that occurs in a driving mechanism for moving the line sensor or original document sub-scanning direction, feed An of the reading a line sequential reading method in of at least three colors, such as R G (green) B (blue), for example, are sequentially to emit light while the line sensor is thereby reading the original document image with the colored light of these light sources. In reading method, generally, the sensor or an document be is moved during reading operation, and thus the read positions of the R, G, B light at the emission timing shift in the sub-scanning described causing color misalignment occur when an original including line images or the read. in the covering main scanning direction separately the colors R (red), G and B (blue) are displaced from each other in the sub-scanning direction that the colors are read simultaneously, color occurs due to fluctuation in the moving speed in the sub-scanning direction. is because, to image data read at a certain point time, the positions of sensors are different for each color, and thus it necessary correct the of the sensors the sub-scanning direction to the moving the spacing the in However, the estimated read position and actual position are displaced from each due in the moving speed in the sub-scanning direction, and as a result, color mis
 An image scanner that reads an Original doCumenT as EleCtRoniC imaGe data includes A Line Sensor such as a CCD (Charge couplEd dEvicE) Or cIS (CoNtact ImAGe sENsoR), iN wHicH a PLuRalitY of Light-reCeiving eleMenTs Are linearly aRRaYed. The imagE scAnner reads thE orIginal DoCumENt imaGe wHile mOving tHE line sEnsor in a dIrECtion (sUB-scanniNG DiRectIon) orthogonal to thE ArRAy direction (maiN scannInG DiRECtiOn) oF the light-rEcEivinG ElementS. alTERNatELy, there is an imAge scanner cONfiGured sUcH thAT the liNe senSoR Is fIxed and the oRigiNal documeNt is moVEd and thE OriginaL documEnt ImaGe is REaD.
HOweVeR, TheRE iS a pROblEm in that WhEn An oriGinaL DOCUmenT imAge iS read By moving the liNe sEnsoR Or tHe oriGinal DocuMeNt, colOr misaLignmEnT occurs due to an eFfecT from mechAniCaL viBrAtion THat occUrs In a Driving MechaniSM foR mOVINg The line sensor or the OrIGInAl documeNt in thE SuB-sCAnning diReCtiOn, or FEEd accUracY. an Example oF the reADiNg Method iS a Line seQuEntIal ReadiNG metHod in wHich lighT sourCEs of at least thrEE colors, such as r (ReD), g (GrEEn) anD B (bLue), for exampLe, arE SequEntiALlY caUSed to Emit lIgHT wHIle the line sensor is mOvEd, therEby reAding the origiNal documenT IMAge with tHe coLOrED light of these lIght sOurces. In thE Line-sequEntiaL reading Method, genERAlly, the lIne SenSor Or aN ORiGinal document TO Be reAd Is contiNuoUsly movEd dUriNg tHe rEaDing operaTion, and tHuS tHe ReAd pOsitiONs of the R, g, aNd B LiGht At the EMissioN timiNg shIfT iN The Sub-scanNInG DIrecTiOn As deScrIbEd aboVe, caUSinG color mIsalignmeNt tO OccuR wHeN an origInal document iNcLuding charAcTerS, line iMAGes or the Like is read.
Even in a case whERe the seNsoRs covErinG the main sCanNing diRecTIon sepAratelY for tHe ColORS R (red), g (GReEn) aNd b (blue) are diSPOseD so as To Be diSplaced From each other in the SUb-sCanning directIon Such THAt The COlORs aRe REad SIMultaneously, colOr misalignMeNT oCcurs due to FLucTuAtion in The moviNg speED in the sUb-scanninG directioN. THis iS BEcaUse, with resPect to imAge data reAD at a cERtAin poInt In time, ThE poSitioNs of thE SenSors aRe diffErEnt for Each cOlOr, and thuS it is necessary to correct The posItionS of The sensorS in THe sUb-scanninG dirEction accoRdiNg tO the mOviNG speeD and THe SpaCIng beTweeN The sensorS In The SUB-sCanning direCTIOn. HOweveR, thE EstimaTed rEad position and the ACtual read positIon aRE DisPlaCEd frOm Each other due to FluCtUATion in thE mOving speed iN the sub-sCaNNing dIrectiOn, and aS a resulT, COlOR mis
 An image scanner that rea ds an orig inaldoc ume nt  aselec tronic image d a ta i ncludes a line sensorsuchas a CC D  ( Charg e Coupl e dD e vic e)  o r C IS (C ontac t I mage Se nsor), inwhi ch  a plurality of  light-rec eiv ing elements  ar e line ar lya rraye d.The i mage s c annerreads the  o r iginal documen t im agewhile moving thel in e  sensor in a d irecti on (s u b -sc ann ing direct io n) or t hogonal to t h e a r ray direction  (main scan n ing  direc ti on) of the  ligh t- r ece iving eleme nts.  Alternat ely, t h ere isa n image  scann ercon figu r ed  s uch  t h att he  li n e s ensor is  f ix ed an d th e o r igin aldocu mentis moved andthe  ori g ina l doc ument  ima ge  is r ead.
H oweve r,  there is a pro blem  in thatwhe nanor igina l  docum ent  im age isread by mov in g t he  line sensor or th eo r ig inal doc ument, co lo r  misalig nm ent  occ u r s due  toa neffect f rom me c ha ni cal vib ra tion t ha t o ccu rs in a dr ivingmechanis m for moving the lin e  sensor or th e  o r i gi n al d ocu ment in the  sub - scan ning di rec t ion,or fe ed ac c uracy. An example o fthe re ading  method is aline seque n t i al readi ng m e th o d in which lig ht so urces of a t  least t hreecolors,such as R ( red), G(gr een ) a ndB (b lue), for exa m p le,ar e seque nti ally ca use d t o e mit  l ight whil e the li ne  s en so r i s mov e d, there by  re ad ing  theo rigina l doc umen tim a gewith th e  c o l ored  l ig ht o f t he se li ghts our ces. In  the line -se q uent ia lreading  method, gene ra lly, the l in e s ensoro r  an orig inal document to be rea d  is con tin uousl y mo ved durin g t he rea din g  opera tion,and t hu s t h e  read p os iti on s of the R , G,and B  l ight  at the  emission timing s h ift  in the sub-s can ning d ir ect i on asde s cri b e d above, causin g color mi sa l ig nment to o c cur  w hen anorigina l doc u ment in cluding c haracters ,line i mag es or thelike isread.
Eve n  in a ca se wh ere  the s en sor s cov eringt hemainscanni ng  direc tionse parately  for the colors R (red) , G (g reen)  an d B (blue ) a r e d isposed s o as  to be dis pla ced  from  ea c h oth er i n  t hes ub-sc anni n g directi o nsuc h th at the colo r s are  read  si m ultane ousl y, color misalign m ent occurs due  tof l uct uat i on i nthe moving spe edin t he sub-s ca nning direc tion. Th is is be cause,  withrespect t oi mage d atarea d at a ce rta in point i nti m e, the  pos it ions o f thes enso r s  are different f or ea c h  colo r , a nd th us  it isn eces sary to co rrect the p ositio ns o f the  sensor sin the  su b- scanning d i rection a ccord ing toth e mo vin g spee d an d the s paci ng  be tween the s en s or si n t he s ub-sc an ning  directio n . Howeve r,t he esti ma ted r ead po s it i o n and theact ual r e a d position ared is p laced  fromeach o ther du e  to  f luctuat ion i n the mov ing speed inth e su b-scanni ng  dir ec tio n,  and as a resul t, color  mis
 An_image scanner_that reads an original_document as_electronic_image data_includes_a line sensor_such as a_CCD (Charge Coupled Device)_or CIS (Contact_Image_Sensor), in which a plurality of light-receiving elements are linearly arrayed. The image scanner_reads_the original_document_image_while moving the line sensor_in a direction (sub-scanning direction)_orthogonal to_the array direction (main scanning direction) of the_light-receiving_elements. Alternately, there_is an image scanner configured such that the line_sensor is fixed and the original_document is moved_and_the_original document image is_read.
However, there is a problem in_that when an original document image_is read by moving the line sensor_or the original document, color misalignment_occurs due to an effect_from mechanical_vibration that occurs in a_driving mechanism for_moving the_line sensor or_the original document in the sub-scanning_direction, or feed_accuracy. An example of the reading_method_is a line_sequential_reading_method in_which light sources_of_at least_three_colors, such as R (red), G_(green)_and B (blue), for example, are sequentially_caused to emit light_while_the line sensor is_moved, thereby reading the original_document image with the colored light_of these_light sources._In the line-sequential reading method, generally, the line sensor or an_original document to be read is_continuously moved during the_reading operation,_and_thus the read_positions_of the_R, G, and B light at the_emission timing_shift in the sub-scanning direction as_described above, causing color_misalignment_to occur when an original document_including characters, line images or the_like is read.
Even in a_case_where_the sensors covering the main_scanning direction separately for the colors_R (red), G_(green) and B (blue) are disposed so_as_to be displaced from each other_in_the sub-scanning direction such that the_colors_are_read simultaneously, color misalignment occurs_due to fluctuation in the moving_speed in the sub-scanning direction. This is because, with_respect to image_data read at a certain_point_in_time, the positions of the sensors are different for each_color, and_thus it is_necessary to correct the positions of the sensors in the_sub-scanning direction according to the moving speed_and the spacing between the sensors in the sub-scanning direction. However,_the estimated read position and the actual read_position are displaced from each other due_to fluctuation in the_moving_speed in the sub-scanning direction, and as_a_result,_color_mis