WO1990003146A1 - Full roll fingerprint enhancement - Google Patents
Full roll fingerprint enhancement Download PDFInfo
- Publication number
- WO1990003146A1 WO1990003146A1 PCT/US1989/003922 US8903922W WO9003146A1 WO 1990003146 A1 WO1990003146 A1 WO 1990003146A1 US 8903922 W US8903922 W US 8903922W WO 9003146 A1 WO9003146 A1 WO 9003146A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- finger
- platen
- rolled
- mist
- full roll
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/117—Identification of persons
- A61B5/1171—Identification of persons based on the shapes or appearances of their bodies or parts thereof
- A61B5/1172—Identification of persons based on the shapes or appearances of their bodies or parts thereof using fingerprinting
Definitions
- This invention relates generally to a finger ⁇ print processing apparatus employing an optical scanning technique and more particularly to a tech ⁇ nique for enhancing the image obtained as a finger is rolled across a platen so as to provide a full roll or nail-to-nail image.
- an optically developed fingerprint that is a full roll finger ⁇ print of the sort that is obtained by rolling a fin- ger across an ink pad from nail edge to nail edge and then rolling the inked finger across a card.
- a finger is placed on a platen and held there without moving during the entire scan, the finger is in contact with the platen for an appreci- able period of time, for example, two seconds. That provides sufficient time for the finger to readily conform to the glass platen surface and it may also provide sufficient time for whatever finger oil exists to fill in the breaks of the ridges and to assist in providing a continuous ridge pattern. What has been found is that when a finger has been rolled across a platen, the contact time along the line of scan is only a fraction of a second and based on observation, this is insufficient ' time to provide as well define a ridge line as is obtained where the finger is held in place without moving.
- This problem is particularly significant with certain relatively degraded fingers in which because of the worn down nature of the fingerprint and/or because of the extremely dry and cracked nature of the fingerprint, the ridges have a substantial num ⁇ ber of cracks and breaks in them. Accordingly, it is a major purpose of this invention to provide a technique to enhance the imagery and particularly the ridge imagery of an optically scanned fingerprint where the finger being scanned is rolled across a platen.
- this invention involves the appli ⁇ cation of a fine water mist to the finger just prior to rolling the finger across the platen.
- optical scan techniques for obtaining an optical scan of a fingerprint are known and de- scribed in the art and, for example, can be seen in United States Patents No. 4,533,837, No. 4,544,267, No. 4,537,484, No. 4,322,163 and No. 4,152,056. None of these disclose the technique of rolling the finger from nail-to-nail across the platen surface. But the optical scan technique is the same whether the finger is placed flat on the platen without movement or is rolled across the platen. All that is required in the latter case is that the zone of contact of the finger to the platen as it is rolled across the platen is maintained in synchronism with the line of scan. However, those apparatus and techniques are not a part of this inventive concept.
- What applicant has invented is a method of enhancing the image obtained when a finger is rolled across a platen during an optical scan fingerprint taking technique.
- Applicant' s method involves inserting the finger in a stream of fine water mist generated, for example, by an ultrasonic humidifier machine.
- the mist deposits on the ridges.
- the finger is then applied to a platen and rolled across the plat ⁇ en-, it has been found that the ridge imagery has more continuity and fewer cracks and breaks than when the exact same operation is performed without first applying the mist.
- an ordinary room humidifier was employed and the finger was passed through the stream of the mist at a distance of about four to eight inches from the nozzle. Because the finger was slowly passed through the stream of the mist, the dwell time of the finger in the mist stream was no more than about one second.
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Medical Informatics (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Physics & Mathematics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Image Input (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
A finger is prepared for optical scan fingerprint taking technique wherein the finger is rolled across a glass platen. The preparation involves applying a drop of a liquid such as water to the finger by inserting the finger into a fine mist of the liquid.
Description
FU L ROLL FINGERPRINT ENHANCEMENT
Background of the Invention
This invention relates generally to a finger¬ print processing apparatus employing an optical scanning technique and more particularly to a tech¬ nique for enhancing the image obtained as a finger is rolled across a platen so as to provide a full roll or nail-to-nail image.
Many optical fingerprint scanning apparatus are known in the art and are disclosed in the lit¬ erature and in patents.
It is often desired to provide an optically developed fingerprint that is a full roll finger¬ print of the sort that is obtained by rolling a fin- ger across an ink pad from nail edge to nail edge and then rolling the inked finger across a card.
It has been found that one can simulate the effect of the ink pad roll in an optical scanning apparatus employing a transparent platen by rolling a finger across the platen in synchronism with the scan line.
Where a finger is placed on a platen and held there without moving during the entire scan, the finger is in contact with the platen for an appreci- able period of time, for example, two seconds. That provides sufficient time for the finger to readily conform to the glass platen surface and it may also provide sufficient time for whatever finger oil
exists to fill in the breaks of the ridges and to assist in providing a continuous ridge pattern. What has been found is that when a finger has been rolled across a platen, the contact time along the line of scan is only a fraction of a second and based on observation, this is insufficient' time to provide as well define a ridge line as is obtained where the finger is held in place without moving.
This problem is particularly significant with certain relatively degraded fingers in which because of the worn down nature of the fingerprint and/or because of the extremely dry and cracked nature of the fingerprint, the ridges have a substantial num¬ ber of cracks and breaks in them. Accordingly, it is a major purpose of this invention to provide a technique to enhance the imagery and particularly the ridge imagery of an optically scanned fingerprint where the finger being scanned is rolled across a platen.
Brief Description
In brief, this invention involves the appli¬ cation of a fine water mist to the finger just prior to rolling the finger across the platen.
Description of the Preferred Embodiments The optical scan techniques for obtaining an optical scan of a fingerprint are known and de-
scribed in the art and, for example, can be seen in United States Patents No. 4,533,837, No. 4,544,267, No. 4,537,484, No. 4,322,163 and No. 4,152,056. None of these disclose the technique of rolling the finger from nail-to-nail across the platen surface. But the optical scan technique is the same whether the finger is placed flat on the platen without movement or is rolled across the platen. All that is required in the latter case is that the zone of contact of the finger to the platen as it is rolled across the platen is maintained in synchronism with the line of scan. However, those apparatus and techniques are not a part of this inventive concept.
What applicant has invented is a method of enhancing the image obtained when a finger is rolled across a platen during an optical scan fingerprint taking technique.
Applicant' s method involves inserting the finger in a stream of fine water mist generated, for example, by an ultrasonic humidifier machine. The mist deposits on the ridges. When the finger is then applied to a platen and rolled across the plat¬ en-, it has been found that the ridge imagery has more continuity and fewer cracks and breaks than when the exact same operation is performed without first applying the mist.
In one embodiment that has been tried and tested, an ordinary room humidifier was employed and
the finger was passed through the stream of the mist at a distance of about four to eight inches from the nozzle. Because the finger was slowly passed through the stream of the mist, the dwell time of the finger in the mist stream was no more than about one second.
Claims
1. The method of preparing a finger for an optical fingerprint scan where the finger is rolled across a platen so as to enhance the imagery com¬ prising the step of: applying a fine mist of liquid particles to the finger.
2. The method of• claim 1 wherein said li¬ quid particles are water.
3. The method of claim 1 wherein the dwell time of the finger in the mist stream is approxi¬ mately one second.
4. The method of claim 2 wherein the dwell time of the finger in the mist stream is approxi¬ mately one second.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US24849288A | 1988-09-23 | 1988-09-23 | |
| US248,492 | 1988-09-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1990003146A1 true WO1990003146A1 (en) | 1990-04-05 |
Family
ID=22939383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1989/003922 Ceased WO1990003146A1 (en) | 1988-09-23 | 1989-09-12 | Full roll fingerprint enhancement |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO1990003146A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1429338A (en) * | 1920-10-23 | 1922-09-19 | Fingerprint Machine Corp | Finger-print composition |
| US2020376A (en) * | 1935-11-12 | Fingerprint record and method of | ||
| US3482498A (en) * | 1967-05-09 | 1969-12-09 | Trw Inc | Ridge pattern recording apparatus |
| FR2490948A1 (en) * | 1980-09-30 | 1982-04-02 | Angenieux P Ets | Resin impression fingerprint reproduction system - uses negative fingerprint impression in synthetic resin to disperse light where resin is thicker, allowing high contrast image to be formed |
-
1989
- 1989-09-12 WO PCT/US1989/003922 patent/WO1990003146A1/en not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2020376A (en) * | 1935-11-12 | Fingerprint record and method of | ||
| US1429338A (en) * | 1920-10-23 | 1922-09-19 | Fingerprint Machine Corp | Finger-print composition |
| US3482498A (en) * | 1967-05-09 | 1969-12-09 | Trw Inc | Ridge pattern recording apparatus |
| FR2490948A1 (en) * | 1980-09-30 | 1982-04-02 | Angenieux P Ets | Resin impression fingerprint reproduction system - uses negative fingerprint impression in synthetic resin to disperse light where resin is thicker, allowing high contrast image to be formed |
Non-Patent Citations (1)
| Title |
|---|
| IBM Technical Disclosure Bulletin, Vol. 8, No. 1, June 1965 (New York, US), D.J. SMITH: "Optical Fingerprinting", page 137 * |
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