# US 2013/0156330 A1 · Encoding information in illumination patterns

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- Number: US 2013/0156330 A1
- Document ID: US20130156330A1
- Status: Published application
- Kind: A1
- Application number: 13/331,073
- Filed: 2011-12-20
- Published: 2013-06-20
- Earliest claimed: 2011-12-20
- Assignees: Eastman Kodak Company
- Inventors: Paul J. Kane; Elena A. Fedorovskaya
- Web page: https://patentgrep.com/patent/US20130156330A1

## CPC

- G06V 10/145: Illumination specially adapted for pattern recognition, e.g. using gratings
- G06V 10/88: Image or video recognition using optical means, e.g. reference filters, holographic masks, frequency domain filters or spatial domain filters
- G06V 20/64: Three-dimensional [3D] objects
- G07D 7/12: Visible light, infrared or ultraviolet radiation
- G07D 7/202: using pattern matching
- G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G07D: HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING

## Abstract

An apparatus for authentication of three-dimensional (3D) structures includes a projector (1510) for projecting a first pattern of illumination (1520) on the three-dimensional structure; a sensor (1525) for detecting a first reflected pattern (1540) from the three-dimensional structure; a computer (1530) for analyzing the first reflected pattern for a first pre-determined characteristic; and wherein the computer authenticates the three-dimensional structure if the pre-determined characteristic is present.

## Claims

### Claim 1

An apparatus for authentication of three-dimensional (3D) structures comprising:
projector for projecting a first pattern of illumination on the three-dimensional structure;
a sensor for detecting a first reflected pattern from the three-dimensional structure;
a computer for analyzing the first reflected pattern for a first pre-determined characteristic; and
wherein the computer authenticates the three-dimensional structure if the pre-determined characteristic is present.

### Claim 2 (depends on 1)

The apparatus of claim 1 wherein analyzing comprises comparing the first reflected pattern to the projected pattern.

### Claim 3 (depends on 1)

The apparatus of claim 1 wherein analyzing comprises comparing the first reflected pattern to a database of patterns.

### Claim 4 (depends on 1)

The apparatus of claim 1 comprising:
wherein the computer inverts the first reflected pattern:
wherein the projector projects the inverted pattern on the three-dimensional structure;
wherein the sensor detects the inverted reflected pattern from the three-dimensional structure; and
wherein the computer authenticates the three-dimensional structure if a second pre-determined characteristic is present.

### Claim 5 (depends on 4)

The apparatus of claim 4 wherein the second predetermined characteristic is the same as the first pattern of illumination.

### Claim 6

The apparatus of 1 further comprising:
wherein the first projector or a second projector projects a second pattern of illumination on the three-dimensional structure;
wherein the sensor detects a second reflected pattern from the three-dimensional structure;
wherein the computer analyzes the second reflected pattern for a second pre-determined characteristic; and
wherein the computer authenticates the three-dimensional structure if the second pre-determined characteristic is present.

### Claim 7 (depends on 1)

The apparatus of claim 1 wherein the first pattern of illumination is monochromatic.

### Claim 8 (depends on 1)

The apparatus of claim 1 wherein the first pattern of illumination is polychromatic.

### Claim 9 (depends on 1)

The apparatus of claim 1 wherein the first pattern of illumination is monochromatic and the second pattern of illumination is polychromatic.