# US 12,217,469 B2 · Photographing apparatus and authentication apparatus

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- Number: US 12,217,469 B2
- Document ID: US12217469B2
- Status: Granted
- Kind: B2
- Application number: 17/944,048
- Filed: 2022-09-13
- Published: 2023-09-07
- Granted: 2025-02-04
- Earliest claimed: 2022-03-03
- Assignees: Hitachi, Ltd.
- Applicants: Hitachi, Ltd.
- Inventors: Yusuke Matsuda; Naoto Miura; Akio Nagasaka; Yo Nonomura; Keiichiro Nakazaki; Masahiro Kato
- Web page: https://patentgrep.com/patent/US12217469B2

## CPC

- G06V 10/143: Sensing or illuminating at different wavelengths
- G06V 40/1318: {using electro-optical elements or layers, e.g. electroluminescent sensing}
- G06V 10/141: Control of illumination
- 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 10/60: relating to illumination properties, e.g. using a reflectance or lighting model
- G06V 10/776: Validation; Performance evaluation
- G06V 10/811: {the classifiers operating on different input data, e.g. multi-modal recognition}
- G06V 40/117: {Biometrics derived from hands}
- G06V 40/1312: {direct reading, e.g. contactless acquisition}
- G06V 40/1341: {Sensing with light passing through the finger}
- G06V 40/1365: {Matching; Classification}
- G06V 40/145: Sensors therefor
- G06T 2207/10048: Infrared image
- G06T 2207/10152: Varying illumination
- G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL

## Abstract

A photographing apparatus includes an irradiation unit configured to irradiate a living body with beams of light having a plurality of wavelengths different from one another, a photographing unit configured to photograph the living body irradiated by the irradiation unit to generate image data of the living body, an image processing module configured to generate, based on the image data generated by the photographing unit, a plurality of pieces of wavelength separation image data, by separation into the plurality of wavelengths, and a control module configured to control, based on the image data and on the plurality of pieces of wavelength separation image data generated by the image processing module, irradiation light amounts of the beams of light having the plurality of wavelengths.

## Claims

### Claim 1

A photographing apparatus, comprising:
a processor, the processor is configured to:
irradiate a living body with beams of light having a plurality of wavelengths different from one another, wherein the living body comprises a plurality of fingers;
photograph the irradiated living body to generate image data of the living body;
generate, based on the image data, a plurality of pieces of wavelength separation image data, by separation into the plurality of wavelengths; and
control, based on the image data and on the plurality of pieces of wavelength separation image data, irradiation light amounts of the beams of light having the plurality of wavelengths,
wherein the processor is configured to control the irradiation light amounts of the beams of light having the plurality of wavelengths, based on regions of some of the plurality of fingers that are included in the image data about the plurality of fingers and the plurality of pieces of wavelength separation image data.

### Claim 2 (depends on 1)

The photographing apparatus according to claim 1, wherein the processor is configured to control the irradiation light amounts of the beams of light having the plurality of wavelengths so that luminance of the image data and luminance of each of the plurality of pieces of wavelength separation image data are contained within a predetermined range.

### Claim 3 (depends on 2)

The photographing apparatus according to claim 2, wherein the image data includes a plurality of pieces of attribute image data having different attributes.

### Claim 4 (depends on 3)

The photographing apparatus according to claim 3, wherein the processor is further configured to control the irradiation light amounts of the beams of light having the plurality of wavelengths so that luminance of at least a specific piece of attribute image data in which a sum of sensitivities to the beams of light at the plurality of wavelengths is largest out of the plurality of pieces of attribute image data is contained within a predetermined range.

### Claim 5 (depends on 4)

The photographing apparatus according to claim 4, wherein the processor is further configured to control the irradiation light amounts of the beams of light having the plurality of wavelengths so that luminance of a specific piece of attribute image data in which a sum of sensitivities to the beams of light having the plurality of wavelengths and a sensitivity to light having another wavelength is largest out of the plurality of pieces of attribute image data is contained within a predetermined range, the light having the another wavelength being light that is received but is not one of the beams of light having the plurality of wavelengths.

### Claim 6 (depends on 1)

The photographing apparatus according to claim 1, wherein the processor is further configured to control the irradiation light amounts of the beams of light having the plurality of wavelengths so that luminance of a specific piece of wavelength separation image data that contributes to precision of authentication at a high contribution ratio out of the plurality of pieces of wavelength separation image data is contained within a predetermined range.

### Claim 7

An authentication apparatus, comprising:
a processor, the processor is configured to:
irradiate a living body with beams of light having a plurality of wavelengths different from one another, wherein the living body comprises a plurality of fingers;
photograph the irradiated living body to generate image data of the living body;
generate, based on the image data, a plurality of pieces of wavelength separation image data, by separation into the plurality of wavelengths;
control, based on the image data and on the plurality of pieces of wavelength separation image data, irradiation light amounts of the beams of light having the plurality of wavelengths;
extract a plurality of pieces of living body feature data by extracting living body feature data from each of the plurality of pieces of wavelength separation image data; and
match each of the plurality of pieces of living body feature data against living body feature data registered in advance,
wherein the processor is configured to control the irradiation light amounts of the beams of light having the plurality of wavelengths, based on regions of some of the plurality of fingers that are included in the image data about the plurality of fingers and the plurality of pieces of wavelength separation image data.