Secure authentication of images

• US 5,799,082 A
• Filed: 11/07/1995
• Issued: 08/25/1998
• Est. Priority Date: 11/07/1995
• Status: Expired due to Term

• Current Assignee: Trimble Navigation Limited (Trimble Inc.)
• Original Assignee: Trimble Navigation Limited (Trimble Inc.)
• Inventors: Murphy, Michael D., Janky, James M., Schipper, John F.
• Primary Examiner(s): Tarcza, Thomas H.
• Assistant Examiner(s): White, Carmen D.
• Application Number:
  US08/554,820
• Time in Patent Office: 1,022 Days
• Field of Search: 380/4, 380/7, 380/25, 380/23, 380/10, 364/449.01, 364/449.7, 364/449.9
• US Class Current: 713/179
• CPC Class Codes: G01S 5/0247 Determining attitude
• CPC Class Codes: G01S 5/12 by co-ordinating position lines of different shape, e.g. hyperbolic, circular, elliptical or radial
• CPC Class Codes: H04N 1/00127 Connection or combination of a still picture apparatus with another apparatus, e.g. for storage, processing or transmission of still picture signals or of information associated with a still picture
• CPC Class Codes: H04N 1/00323 with a measuring, monitoring or signaling apparatus, e.g. for transmitting measured information to a central location
• CPC Class Codes: H04N 1/32144 embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
• CPC Class Codes: H04N 1/32208 involving changing the magnitude of selected pixels, e.g. overlay of information or super-imposition H04N1/32219, H04N1/32224 take precedence
• CPC Class Codes: H04N 2101/00 Still video cameras
• CPC Class Codes: H04N 2201/3233 of authentication information, e.g. digital signature, watermark
• CPC Class Codes: H04N 2201/3253 Position information, e.g. geographical position at time of capture, GPS data
• CPC Class Codes: H04N 2201/327 which are undetectable to the naked eye, e.g. embedded codes
• CPC Class Codes: H04N 2201/3274 Storage or retrieval of prestored additional information
• CPC Class Codes: H04N 2201/3277 The additional information being stored in the same storage device as the image data
• CPC Class Codes: H04N 2201/3281 Encryption; Ciphering

Abstract

Apparatus for capturing and authenticating a visual image of a selected view, using a digital image forming means, such as a digital camera, together with a position determining system that provides position information, including location, angular orientation and/or time of observation at the time a digital image is formed by the digital camera. Once captured, the visual or electronic image and accompanying position information cannot be deleted or altered within the digital camera and can be downloaded only by an authorized downloader. The digital image of the selected view is presented as an array of pixels with associated pixel values. The position information may be incorporated in the digital image by altering selected pixel bit values for a selected pattern of pixels in the pixel array, or as any other suitable overlay; and this selected pattern may be determined using the position information. The position information may be encrypted, using an encryption key based on position information, and may be stored as part of the digital image. Optionally, position information includes the distance from the digital camera to a selected object in the selected view.

Claims

1. Apparatus for capturing and authenticating an image, the apparatus comprising:

a digital image camera, having a lens that forms a digitally expressed image of a selected view;

digital image recording and storage means for receiving the digitally expressed image from the camera and for storing this digitally expressed image as an array of pixel values, with each pixel value corresponding to a pixel in an array of pixels; and

position determination means for determining position information, which includes at least one of the location of the camera, the angular orientation of the camera and the time at which the camera forms a digitally expressed image and for storing this position information as part of the digitally expressed image in the digital image recording and storage means, where the position information is stored as part of the digitally expressed image as an overlay on, or modification of, digital values representing pixel values for the digitally expressed image.

2. The apparatus of claim 1, wherein said position determination means is part of a Satellite Positioning System ("SATPS") that is drawn from a class of location determination systems consisting of the Global Positioning System, the Global Orbiting Navigational Satellite System, the Motorola Iridium System and the Low Earth Orbiting System.

3. The apparatus of claim 1, wherein said position information is stored by altering the pixel value information contained in a selected group of two or more pixels that are used to form said digitally expressed image.

4. The apparatus of claim 1, wherein said position determination means allows at least one of said location information, said angular orientation information and said time information to be read out in visually perceptible form.

5. The apparatus of claim 1, wherein said position determination means allows at least one of said location information, said angular orientation information and said time information to be read out in electronically perceptible form.

6. The apparatus of claim 1, further including rangefinder means for determining the distance from said digital image camera to a selected object in said selected view at the time said digitally expressed image is formed by said digital image camera and for including information on this distance in said position information.

7. The apparatus of claim 1, wherein said position determination means is part of a ground-based location determination system that is drawn from a class of location determination systems consisting of Loran, Tacan, Decca, Omega and Metricom.

8. The apparatus of claim 1, wherein said position determination means stores said position information in an encrypted format with a selected encryption key that is determined by reference to at least one of said location information, said angular orientation information and said time of image formation information.

9. The apparatus of claim 1, further comprising image authentication means for receiving a selected digitally expressed image and associated position information for the selected image from said digital image recording and storage means, for determining the associated position information for the selected image, for comparing the associated position information with authentic position information for the selected image, and for accepting the selected image as authentic only if the associated position information and the authentic position information substantially agree with each other.

10. The apparatus of claim 1, further comprising image authentication means for receiving position information associated with a selected digitally expressed image, for comparing the associated position information with authentic position information for the selected image, and for accepting the selected image as authentic only if the associated position information and the authentic position information substantially agree with each other.

11. The apparatus of claim 3, wherein each pixel in said selected group of pixels has at least one pixel bit value altered, relative to the pixel bit values used by this pixel to represent said digitally expressed image, to contain a portion of said position information that is to be stored.

12. The apparatus of claim 3, wherein the location of at least one of said selected group of two or more pixels is chosen using said position information.

13. The apparatus of claim 3, wherein said selected group of two or more pixels is chosen so that any pixel in a selected region of pixels that are part of said digitally expressed image is within a selected distance of at least one of said selected group of two or more pixels.

14. The apparatus of claim 13, further comprising digital image indexing means, connected to at least one of said digital image recording and storage means and said display means, for associating an indicium with at least one selected digital image stored in said recording and storage means and for causing said display means to display at least a portion of the selected digital image and the associated position information when this indicium is selected by said recording and storage means or said display means.

15. The apparatus of claim 13, further comprising a digital image lock, operatively associated with at least one of said digital image recording and storage means and said display means, that allows a digitally expressed image and its corresponding position information that is stored in said digital image recording and storage means to be displayed but does not permit deletion or alteration of any portion of the digitally expressed image or any portion of its corresponding position information within said digital image recording and storage means.

16. The apparatus of claim 15, wherein said digital image lock comprises at least one Read Only Memory (ROM) chip having a plurality of programmable sites, with each programmable site having an initial state when the site is unprogrammed and having a first activated state and a second activated state that is distinct from the first activated state, whereby formation of a digital image on a ROM chip causes each programmable site to enter a first activated state or a second activated state that cannot be subsequently altered.

17. Apparatus for capturing and authenticating an image, the apparatus comprising:

a digital image camera, having a lens that forms a digitally expressed image of a selected view;

digital image recording and storage means for receiving the digitally expressed image from the camera and for storing this digitally expressed image as an array of pixel values, with each pixel value corresponding to a pixel in an array of pixels;

position determination means for determining position information, which includes at least one of the location of the camera, the angular orientation of the camera and the time at which the camera forms a digitally expressed image and for storing this position information as part of the digitally expressed image in the digital image recording and storage means; and

display means, connected to the digital image recording and storage means, for providing information contained in a digital frame in at least one of electronically perceptible form, visually perceptible form and audibly perceptible form, to allow authentication of, or withholding of authentication of, information contained in the digital frame, where the display means displays the digitally expressed image and displays at least a portion of the position information as an overlay on the digitally expressed image in visually perceptible form.

18. The apparatus of claim 17, wherein said display means provides said information contained in said digital frame in said visually perceptible form and provides an indicium that indicates at least a portion of said position information, associated with said digitally expressed image, that is stored.

19. The apparatus of claim 17, wherein said display means provides said information contained in said digital frame in said visually perceptible form with an adjustable scale for said visually perceptible form.