n dgtl mg prcssng nd cmptr vsn, mg sgmnttn s th prcss f prttnng dgtl mg nt mltpl mg sgmnts, ls knwn s mg rgns r mg bjcts (sts f pxls). Th gl f sgmnttn s t smplfy nd/r chng th rprsnttn f n mg nt smthng tht s mr mnngfl nd sr t nlyz. mg sgmnttn s typclly sd t lct bjcts nd bndrs (lns, crvs, tc.) n mgs. Mr prcsly, mg sgmnttn s th prcss f ssgnng lbl t vry pxl n n mg sch tht pxls wth th sm lbl shr crtn chrctrstcs.
Th rslt f mg sgmnttn s st f sgmnts tht cllctvly cvr th ntr mg, r st f cntrs xtrctd frm th mg (s dg dtctn). ch f th pxls n rgn r smlr wth rspct t sm chrctrstc r cmptd prprty, sch s clr, ntnsty, r txtr. djcnt rgns r sgnfcntly dffrnt wth rspct t th sm chrctrstc(s). Whn ppld t stck f mgs, typcl n mdcl mgng, th rsltng cntrs ftr mg sgmnttn cn b sd t crt 3D rcnstrctns wth th hlp f gmtry rcnstrctn lgrthms lk mrchng cbs.