Method of deriving characteristic contours from a colored picture

• US 4,055,833 A
• Filed: 06/10/1975
• Issued: 10/25/1977
• Est. Priority Date: 06/14/1974
• Status: Expired due to Term

• Current Assignee: Esselte Security Systems AB
• Original Assignee: Rolf Eric Rothfjell
• Inventors: Rothfjell, Rolf Eric
• Primary Examiner(s): Boudreau, Leo H.
• Application Number:
  US05/585,668
• Time in Patent Office: 868 Days
• Field of Search: 340/146.3 E, 340/149 A, 235/61.7 B, 354/102, 354/103, 354/104, 354/109, 35/28, 40/2.2
• US Class Current: 382/118
• CPC Class Codes: G03B 15/00 Special procedures for taking photographs; Apparatus therefor
• CPC Class Codes: G03B 17/24 with means for separately producing marks on the film, e.g. title, time of exposure
• CPC Class Codes: G03B 2217/241 with means for producing composite exposures, e.g. exposing an image and a border, producing identity cards
• CPC Class Codes: G03B 33/00 Colour photography, other than mere exposure or projection of a colour film printing apparatus G03B27/00; stereoscopic colour photography G03B35/00
• CPC Class Codes: G03C 7/00 Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes diffusion transfer processes G03C8/00
• CPC Class Codes: G06V 40/166 using acquisition arrangements
• CPC Class Codes: G07C 9/25 using biometric data, e.g. fingerprints, iris scans or voice recognition
• CPC Class Codes: Y10S 283/904 Credit card

Abstract

A method of deriving characteristic curves from a colored photograph of an object, which comprises making an image comprising only one of the basic colors of the colored photograph, the contrast of said image being enhanced, so that only the areas of the object which are most strongly colored in said color are reproduced.

Claims

1. A method of producing an identity document comprising the steps of making corresponding multicolored and blue monochromatic photographs of the face of a person to be identified, the monochromatic photograph being made with the contrast of the image enhanced so that only areas of great color intensity are reproduced, and mounting both photographs on a support.

2. The method of claim 1 in which the multicolored and the monochromatic photographs are taken simultaneously.

3. The method of claim 1 in which the monochromatic photograph is made from the multicolored photograph.

4. An identity document comprising a support mounting corresponding multicolored and monochromatic photographs of the face of the person to be identified, the monochromatic photograph having been made with the contrast of the image enhanced so that only areas of great color intensity are reproduced.

5. The identity document as claimed in claim 4 having corresponding multicolored and monochromatic photographs of the face from a plurality of different points of view.