# US 10,311,298 B2 · Biometric camera

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- Number: US 10,311,298 B2
- Document ID: US10311298B2
- Status: Granted
- Kind: B2
- Application number: 15/968,578
- Filed: 2018-05-01
- Published: 2018-09-20
- Granted: 2019-06-04
- Earliest claimed: 2013-09-30
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Ilia Ovsiannikov; Yibing Michelle Wang; Yong-Hwa Park; Yong-Chul Cho; Heesun Yoon; ChangYoung Park; Dirk Smits
- Web page: https://patentgrep.com/patent/US10311298B2

## CPC

- G06F 21/32: using biometric data, e.g. fingerprints, iris scans or voiceprints
- G06V 40/1312: {direct reading, e.g. contactless acquisition}
- G06V 40/19: Sensors therefor
- G06V 40/197: {Matching; Classification}
- G06T 7/586: from multiple light sources, e.g. photometric stereo
- G06T 2207/20201: Motion blur correction
- G07C 9/37: using biometric data, e.g. fingerprints, iris scans or voice recognition
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G07C: TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE

## Abstract

Exemplary embodiments for a biometric camera system for a mobile device, comprise: a near infrared (NIR) light source on the mobile device that flashes a user of the mobile device with near infrared light during image capture; a biometric camera located on the mobile device offset from the NIR light source, the biometric camera comprising: an extended depth of field (EDOF) imaging lens; a bandpass filter located adjacent to the EDOF imaging lens to reject ambient light during image capture; and an imaging sensor located adjacent the bandpass filter that converts an optical image of an object into an electronic signal for image processing; and a processor configured to receive video images of an iris of a user from the image sensor, and attempt to match the video images of the iris with previously registered images stored in an iris database, wherein if a match is found, the user is authenticated.

## Claims

### Claim 1

A biometric camera system for a mobile device, comprising:
a near infrared (NIR) light source on the mobile device that illuminates a user of the mobile device with near infrared light during image capture;
a biometric camera located on the mobile device offset from the NIR light source, the biometric camera comprising:
an extended depth of field (EDOF) imaging lens; and
an imaging sensor adjacent to the EDOF imaging lens that converts an optical image of an object into an electronic signal for image processing;
a solid-state shutter between the EDOF and the imaging sensor, the solid-state shutter having at least two separately addressable shutter areas, such that successive frames may be captured, each with at least one of the separately addressable shutter areas opened during the frame capture; and
a processor configured to receive video images of an iris of a user from the image sensor and attempt to match the video images of the iris with previously registered images stored in an iris database, wherein if a match is found, the user is authenticated.

### Claim 2 (depends on 1)

The system of claim 1, wherein the solid-state shutter comprises gallium arsenide (GaAs).

### Claim 3 (depends on 1)

The system of claim 1, wherein the image sensor further includes at least one of a rolling shutter and a freeze-frame shutter.

### Claim 4 (depends on 1)

The system of claim 1, further comprising further comprising:
a bandpass filter adjacent of the EDOF to reject ambient light during image capture.

### Claim 5 (depends on 4)

The system of claim 4, further comprising a visible light filter located adjacent to the bandpass filter that rejects visible light.

### Claim 6 (depends on 1)

The system of claim 1, wherein the processor is further configured to reduce exposure from ambient light by:
starting exposure of the image sensor; and
reducing readout time by identifying an iris position on a user from a previously captured image and defining a window of interest around the iris position, and subsequently capturing and reading out from a portion of the image sensor defined by the window of interest.

### Claim 7 (depends on 1)

The system of claim 1, wherein the image sensor comprises a rolling shutter and wherein the NIR light source is synchronously pulsed with the readout of the rolling shutter.

### Claim 8 (depends on 1)

The system of claim 1, wherein the NIR light source and the biometric camera are used for at least one of: a night camera, a 30 time-of-flight sensor, eye position detection and gaze tracking; and motion detection.

### Claim 9

A biometric camera system for a mobile device, comprising:
a near infrared (NIR) light source on the mobile device that illuminates a user of the mobile device with near infrared light during image capture;
a biometric camera located on the mobile device offset from the NIR light source, the biometric camera comprising:
an extended depth of field (EDOF) imaging lens; and
an imaging sensor adjacent to the EDOF imaging lens that converts an optical image of an object into an electronic signal for image processing; and
a processor configured to receive video images of an iris of a user from the image sensor and attempt to match the video images of the iris with previously registered images stored in an iris database, wherein if a match is found, the user is authenticated; wherein the processor is further configured to implement a proximity sensor operation by:
capturing a first signal with the image sensor and measuring a first intensity of ambient light;
enabling the NIR light source;
capturing a second signal with the image sensor and measuring a second intensity of ambient light and any reflected NIR light;
disabling the NIR light source; and
determining a difference between the first and second intensity of ambient light measurement, wherein a signal difference surpassing a threshold indicates an object present in proximity.

### Claim 10

A biometric camera system for a mobile device, comprising:
a near infrared (NIR) light source on the mobile device that illuminates a user of the mobile device with near infrared light during image capture, wherein NIR light is covered with a structured light pattern to implement 30 sensing;
a biometric camera located on the mobile device offset from the NIR light source, the biometric camera comprising:
an extended depth of field (EDOF) imaging lens; and
an imaging sensor adjacent to the EDOF imaging lens that converts an optical image of an object into an electronic signal for image processing; and
a processor configured to receive video images of an iris of a user from the image sensor and attempt to match the video images of the iris with previously registered images stored in an iris database, wherein if a match is found, the user is authenticated.

### Claim 11

A biometric camera system for a mobile device, comprising:
a front-facing camera;
a near infrared (NIR) light source on the mobile device that illuminates a user of the mobile device with near infrared light during image capture, the NIR light source being covered with a structured light pattern to implement 30 sensing;
a biometric camera located on the mobile device offset from the NIR light source, the biometric camera comprising:
an extended depth of field (EDOF) imaging lens; and
an imaging sensor located adjacent to the EDOF that converts an optical image of an object into an electronic signal for image processing; and
a processor configured to:
use the front-facing camera to capture RGB images of a user's face;
use the NIR light source with the structure light pattern and the biometric camera to capture one or more 30 depth maps of the user's face;
use the RGB images and the one or more 30 depth maps to create a 30model of the user's face; and
use the 30 model to create a biometric signature for the user.

### Claim 12 (depends on 11)

The system of claim 11, wherein the biometric camera system is used to simultaneously capture an image of the user's iris to perform multi-factor authentication based on iris detection and 30 model detection.

### Claim 13 (depends on 11)

The system of claim 11, wherein the image sensor further includes at least one of a rolling shutter and a freeze-frame shutter.