Fingerprint vs. thumbprint

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Author Message   Webservant (member) Moderator Username: member Post Number: 202 Registered: 03-1997 Posted on Saturday, November 18, 2006 - 11:20 am:        The question you pose is important because fingerprint recording sequence errors are one of the most common problems encountered in fingerprint repositories. To help preclude such errors, national and international fingerprint standards specify that records include ten rolled impressions of the individual fingers and thumbs, two plain impressions of the thumbs, and two simultaneously obtained plain impressions of the four remaining fingers on each hand. On ink and paper fingerprint cards, these impressions are represented by (from left to right) the four left hand fingers recorded simultaneously, then the left thumb, then the right thumb, then the right hand fingers recorded simultaneously. Live scan "print reading" devices easily distinguish index fingers from thumbs as follows: Plain impressions (sometimes called simultaneous impressions or flats) are normally captured first, enabling most systems to confirm that rolled impressions rolled after plain impressions are captured in the correct sequence by comparing rolled against plain. Such systems automatically segment the four plain impression fingers for comparison against corresponding rolled impressions, and provide a message to the operator when a sequence problem is detected. Fingerprint card scanning operations (also sometimes referred to as fingerprint card conversion or dead scan), typically segment the plain impressions from the bottom of the card for comparison against rolled impressions in corresponding blocks of the card.   Eddie Henry (Unregistered Guest) Unregistered guest Posted From: host86-143-13-155.range86-143.btcentralplus.com Posted on Saturday, November 18, 2006 - 07:01 am:        if it has been loaded with the friction ridge detail of both the fingers then it will be able to - if it works properly. a human being expert in identification of fingerprints would have no problem at all. it is possible that examination of the ridge detail may not even be necessary because to the trained eye a thumb print is often easy to spot   Ann Crighton (Unregistered Guest) Unregistered guest Posted From: cpe-24-29-132-165.nyc.res.rr.com Posted on Thursday, November 09, 2006 - 10:50 pm:        Would a print reading device be able to distinguish between the index finger and a thumb? Thanks.