Method and device for secure transmission of JPEG encoded images

• US 20050281471A1
• Filed: 06/24/2005
• Published: 12/22/2005
• Est. Priority Date: 12/31/2002
• Status: Active Grant

• Current Assignee: OL Security LLC (Intellectual Ventures LLC)
• Original Assignee: Medialive (Kudelski SA)
• Inventors: LeComte, Daniel
• Granted Patent: US 7,221,802 B2
• Time in Patent Office: Days
• US Class Current: 382/232
• CPC Class Codes: H04N 19/60 using transform coding
• CPC Class Codes: H04N 19/88 involving rearrangement of data among different coding units, e.g. shuffling, interleaving, scrambling or permutation of pixel data or permutation of transform coefficient data among different blocks

Abstract

A process for distributing digital still images according to a nominal format, where each image is broken into blocks and macroblocks that depend upon each other by correlation coefficients including analyzing contents of the still images to generate two parts: a) a primary contents in nominal format corresponding to the image as modified by substitution of certain correlation coefficients with coefficients that are of the same type, but which are random, and b) additional digital nature of any format, which includes substituted correlation coefficients and digital data that are likely to allow reconstruction of the modified image; transmitting separately the modified primary contents in real or deferred time and additional digital information in real time at a moment of viewing from a server towards recipient equipment; and calculating a synthesis of contents of the recipient equipment that is in nominal format as a function of the modified primary contents and the additional data.

Claims

1. A process for distributing digital still images according to a nominal format, where each image is broken into blocks and macroblocks that depend upon each other by correlation coefficients comprising:

analyzing contents of the still images to generate two parts;

a) a primary contents in nominal format corresponding to an image as modified by substitution of certain correlation coefficients with coefficients that are of the same type, but which are random, and b) additional digital nature of any format, which comprises substituted correlation coefficients and digital data that are likely to allow reconstruction of the modified image;

transmitting separately the modified primary contents in real or deferred time and additional digital information in real time at a time of viewing from a server towards recipient equipment; and

calculating a synthesis of contents of the recipient equipment that is in nominal format as a function of the modified primary contents and the additional data.

2. The process according to claim 1, wherein the nominal format is defined by the JPEG standard.

3. The process according to claim 1, wherein the synthesis produces an image that is identical to the original image.

4. The process according to claim 1, wherein the analysis determines the correlation coefficients to be modified to obtain the principal modified contents through inversion of the two correlation coefficients, or replacement of the correlation coefficients of a still image by random values.

5. The process according to claim 1, wherein the synthesis is authorized for a consultation of a private copy requested by the client.

6. Apparatus for fabricating digital still images according to claim 1, comprising at least one multimedia server containing original still images and a device for analyzing each image emanating from the server to generate the two parts.

7. A device that uses digital still images according to claim 1, comprising a standard image decoder, at least one recording interface designed to store the modified primary contents, at least one display interface, and means for restoring the original image using the two parts.

9. The apparatus according to claim 1, wherein the two parts generated can be employed in a single device, a group of devices or for all devices.

8. A system for transmitting digital still images comprising a device comprising at least one multimedia server containing original still images and a device for analyzing each image emanating from the server to generate the two parts, at least one device comprising a standard image decoder, at least one recording interface designed to store the modified primary contents, at least one display interface, and means for restoring the original image using the two parts and at least one communications network between the fabricating device and the user device(s).