Handbook of Forensic Services (pdf) - FBI

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Handbook of Forens c Serv ces 2007 Authenticity and Image-Manipulation Detection Photographic evidence—including film, video, and d g tal mages—can be exam ned to determ ne whether the mage s the result of a compos te, an alterat on, or a copy. Location, Time, and Date Exam nat ons of photograph c ev dence can determ ne the locat on, t me, and date that an mage was taken. Source and Age Photographic products, including film and prints, can be dated, and the source can be establ shed by exam n ng manufactur ng character st cs. Th s can establ sh the t me frame dur ng wh ch a photograph was taken. Cameras Cameras, both film and digital, seized as evidence can be compared w th mages to determ ne whether a specific camera captured a specific mage. S m larly, d g tal v deo cameras can be compared w th v deo cl ps. Video St ll mages can be produced from v deo cl ps, enhanced and enlarged, and used n courtroom presentat ons. 74
Handbook of Forens c Serv ces 2007 Automobile Make and Model Identification Veh cles dep cted n surve llance mages can be compared w th the Nat onal Automot ve Image F le to determ ne make and model. Child Pornography Examinations Se zed mages of ch ld pornography should be searched for known v ct ms by check ng w th the Nat onal Center for M ss ng and Explo ted Ch ldren and the Innocent Images Nat onal In t at ve. The mages also can be compared w th mages n the Ch ld Explo tat on and Obscen ty Reference F le to dent fy the source of the mages. V deo cl ps can be exam ned to determ ne f any of the people and scenes dep cted n the v deo cl ps are also recorded as st ll mages n the reference file. V deo cl ps and st ll mages also can be exam ned to determ ne f they dep ct record ngs or mages of real people and events or whether they represent computer-generated subjects and events. Questions concerning image analysis examinations should be directed to 703-985- 1393. Questions concerning image analysis evidence should be directed to 703-985-1388. Image analys s exam nat ons may not be subm tted d rectly from ent t es outs de the FBI. 75
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