# US 11,076,069 B2 · Pixelation density increment for embedding information

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- Number: US 11,076,069 B2
- Document ID: US11076069B2
- Status: Granted
- Kind: B2
- Application number: 16/236,880
- Filed: 2018-12-31
- Published: 2019-07-04
- Granted: 2021-07-27
- Earliest claimed: 2017-12-29
- Assignees: Idemia Identity & Security USA LLC
- Applicants: Idemia Identity & Security USA LLC
- Inventors: Robert L. Jones; Yecheng Wu; Daoshen Bi
- Web page: https://patentgrep.com/patent/US11076069B2

## CPC

- H04N 1/32304: {Embedding different sets of additional information}
- G06V 10/44: Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersections; Connectivity analysis, e.g. of connected components
- G06V 30/40: Document-oriented image-based pattern recognition
- H04N 1/32229: {with selective or adaptive application of the additional information, e.g. in selected regions of the image (H04N1/32213 takes precedence)}
- G06V 20/95: {Pattern authentication; Markers therefor; Forgery detection}
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING

## Abstract

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for determining, by a pixelation device, an arrangement of pixels for generating representations of data for a document; adjusting, by an increment module and based on the arrangement of pixels, an optical density of one or more pixels included in the arrangement; associating, by the pixelation device, a plurality of distinct types of credential data with one or more line patterns included in the arrangement of pixels; and generating, by the pixelation device, multiple line patterns at a document, the multiple line patterns encoding the plurality of distinct types of credential data.

## Claims

### Claim 1

A computer-implemented method, comprising:
accessing data representing items of an identifying information about an individual;
assigning an item of the identifying information to an array of pixels that correspond to a section of an identification document, each pixel in the array of pixels having a corresponding optical density that represents a measure of relative brightness of the pixel;
determining an encoding of the item based on a line pattern that includes a plurality of distinct line segments and the corresponding optical density of each pixel in the array of pixels;
encoding the item of the identifying information at the section of the identification document by adjusting a respective optical density of each pixel in the array of pixels to apply the line pattern to the identification document; and
based on the encoding, generating an identification document that i) includes the identifying information printed on the identification document and ii) encodes the item at the section using the plurality of distinct line segments of the line pattern.

### Claim 2 (depends on 1)

The method of claim 1, wherein encoding the item comprises:
selecting one or more pixels of the array of pixels; and
assigning a particular optical density level to each of the selected one or more pixels of the array of pixels.

### Claim 3 (depends on 2)

The method of claim 2, further comprising:
generating the line pattern by ascribing a numerical or text value to the one or more pixels of the array of pixels using the particular optical density level assigned to each of the selected one or more pixels.

### Claim 4 (depends on 3)

The method of claim 3, further comprising:
generating multiple arrays of pixels, each array of pixels of the multiple arrays being generated based on a coded scheme to represent particular types of line patterns on the identification document; and
generating a plurality of line patterns at the identification document at least by adjusting optical density of each pixel in the multiple arrays of pixels.

### Claim 5 (depends on 4)

The method of claim 4, wherein each of the multiple arrays of pixels is disposed at a specific location of the identification document and is used to encode a different item of the identifying information about the individual.

### Claim 6 (depends on 1)

The method of claim 1, wherein:
each pixel in the array of pixels is used to depict representations of an image of the individual and that corresponds to the item of the identifying information; and
the line pattern is detectable by a detector device based on differences in optical density of two or more pixels in the array of pixels.

### Claim 7 (depends on 1)

The method of claim 1, further comprising:
detecting, by a detector device, the plurality of distinct line segments of the line pattern applied to the identification document based on the adjusted optical density of each pixel in the array of pixels.

### Claim 8 (depends on 7)

The method of claim 7, further comprising:
obtaining, by the detector device, the item of the identifying information encoded at the section of the identification document in response to decoding each line segment of the plurality of distinct line segments.

### Claim 9 (depends on 1)

The method of claim 1, wherein generating the identification document comprises:
using pixelation density increments to embed each of the items of the identifying information at the identification document.

### Claim 10 (depends on 9)

The method of claim 9, wherein the identification document is a digital identification document and the encoded item of the identifying information describes a physical attribute of the individual.

### Claim 11

A system, comprising:
one or more processing devices; and
one or more non-transitory machine-readable storage devices storing instructions that are executable by the one or more processing devices to cause performance of operations comprising:
accessing data representing items of an identifying information about an individual;
assigning an item of the identifying information to an array of pixels that correspond to a section of an identification document, each pixel in the array of pixels having a corresponding optical density that represents a measure of relative brightness of the pixel;
determining an encoding of the item based on a line pattern that includes a plurality of distinct line segments and the corresponding optical density of each pixel in the array of pixels;
encoding the item of the identifying information at the section of the identification document by adjusting a respective optical density of each pixel in the array of pixels to apply the line pattern to the identification document; and
based on the encoding, generating an identification document that i) includes the identifying information printed on the identification document and ii) encodes the item at the section using the plurality of distinct line segments of the line pattern.

### Claim 12 (depends on 11)

The system of claim 11, wherein encoding the item comprises:
selecting one or more pixels of the array of pixels; and
assigning a particular optical density level to each of the selected one or more pixels of the array of pixels.

### Claim 13 (depends on 12)

The system of claim 12, further comprising:
generating the line pattern by ascribing a numerical or text value to the one or more pixels of the array of pixels using the particular optical density level assigned to each of the selected one or more pixels.

### Claim 14 (depends on 13)

The system of claim 13, wherein the operations further comprise:
generating multiple arrays of pixels, each array of pixels of the multiple arrays being generated based on a coded scheme to represent particular types of line patterns on the identification document; and
generating a plurality of line patterns at the identification document at least by adjusting optical density of each pixel in the multiple arrays of pixels.

### Claim 15 (depends on 14)

The system of claim 14, wherein each of the multiple arrays of pixels is disposed at a specific location of the identification document and is used to encode a different item of the identifying information about the individual.

### Claim 16 (depends on 11)

The system of claim 11, wherein:
each pixel in the array of pixels is used to depict representations of an image of the individual and that corresponds to the item of the identifying information; and
the line pattern is detectable by a detector device based on differences in optical density of two or more pixels in the array of pixels.

### Claim 17 (depends on 16)

The system of claim 16, wherein the operations further comprise:
detecting, by a detector device, the plurality of distinct line segments of the line pattern applied to the identification document based on the adjusted optical density of each pixel in the array of pixels.

### Claim 18 (depends on 17)

The system of claim 17, wherein the operations further comprise:
obtaining, by the detector device, the item of the identifying information encoded at the section of the identification document in response to decoding each line segment of the plurality of distinct line segments.

### Claim 19 (depends on 18)

The system of claim 18, wherein generating the identification document comprises:
using pixelation density increments to embed each of the items of the identifying information at the identification document, wherein the identification document is a digital identification document and the encoded item of the identifying information describes a physical attribute of the individual.

### Claim 20

One or more non-transitory machine-readable storage devices storing instructions that are executable by one or more processing devices to cause performance of operations comprising:
accessing data representing items of an identifying information about an individual;
assigning an item of the identifying information to an array of pixels that correspond to a section of an identification document, each pixel in the array of pixels having a corresponding optical density that represents a measure of relative brightness of the pixel;
determining an encoding of the item based on a line pattern that includes a plurality of distinct line segments and the corresponding optical density of each pixel in the array of pixels;
encoding the item of the identifying information at the section of the identification document by adjusting a respective optical density of each pixel in the array of pixels to apply the line pattern to the identification document; and
based on the encoding, generating an identification document that i) includes the identifying information printed on the identification document and ii) encodes the item at the section using the plurality of distinct line segments of the line pattern.