Iris Camera Light Source Distance Optimization

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Solution Overview

Problem

Current security technologies face challenges in accurately capturing and authenticating iris patterns due to variations in distance and luminance, which affect the size of the retina reflection region and the luminance of the iris region in images, making it difficult to extract reliable iris patterns for identification.

Innovation Solution

An electronic device equipped with a light source module, an iris camera, and a processor is arranged such that the distance between the light source module and the iris camera falls within specific threshold distances to optimize the size of the retina reflection region and the luminance of the darkest portion in the iris image, ensuring accurate iris pattern capture and authentication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If the distance between the light source module and the iris camera is reduced, then the luminance of the iris region is improved, but the retina reflection region size increases and may overlap with the iris region

Engineering Contradiction:

Improveluminance of the iris regionVSAvoidretina reflection region size

Core Design Contradiction:

Illumination intensityVSArea of stationary object

Solution Approach 1:

The patent applies parameter changes by precisely controlling the distance between the light source module and the iris camera within a specific range (first threshold distance to second threshold distance). This distance parameter optimization simultaneously achieves sufficient luminance for the iris region while preventing excessive enlargement of the retina reflection region, thereby resolving the contradiction between these two parameters.

Inventive Principle:

Principle #35Parameter changes

2Area of stationary object

If the distance between the light source module and the iris camera is increased, then the retina reflection region size is reduced, but the luminance of the iris region decreases

Engineering Contradiction:

Improveretina reflection region sizeVSAvoidluminance of the iris region

Core Design Contradiction:

Area of stationary objectVSIllumination intensity

Solution Approach 1:

The patent resolves this contradiction by establishing an optimal distance range parameter between the light source module and the iris camera. Within this specified range, the system achieves the right balance: the retina reflection region is sufficiently small to avoid overlap with the iris region, while the luminance of the iris region remains adequate for pattern extraction.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If the distance between the light source module and the iris camera is not optimized, then the device complexity is reduced, but the measurement precision of iris patterns deteriorates

Engineering Contradiction:

Improvearrangement complexityVSAvoidiris pattern extraction accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent addresses this contradiction by defining a specific distance range (between first and second threshold distances) for arranging the light source module and iris camera. This parameter specification ensures that iris patterns can be captured with sufficient precision for reliable authentication, while avoiding the need for overly complex adjustment mechanisms.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This configuration enables precise iris authentication by maintaining a retina reflection region size that does not overlap with the iris region and achieving sufficient luminance for pattern extraction, enhancing the reliability of iris-based identification systems.

Implementation Method 1

a light source module (420) and an iris camera (410) which are spaced from each other by a distance of a specified range, the iris camera (410) acquiring an image regarding an iris of a user by detecting infrared rays radiated from the light source module (420)

Methodology Applied

Scientific EffectInfrared radiation: Infrared Radiation

Implementation Method 2

the first threshold distance for generating a retina reflection region to have a specified size in the image of the iris, which is obtained by detecting, by the iris camera, the infrared rays reflected from a user's retina

Methodology Applied

Scientific EffectLight reflection: Reflection

Data Source

PatentUS10430651B2Electronic device including iris camera

Publication Date: 2019.10.01 SAMSUNG ELECTRONICS CO LTD

AI summary

According to various example embodiments of the present disclosure, an electronic device includes: a light source module comprising a light source and associated circuitry; an iris camera configured to capture an iris of a user using infrared rays radiated from the light source module; and a processor electrically connected with the light source module and the iris camera and configured to generate an image regarding the iris. When a user is located at a distance within a specified range from the electronic device, the light source module and the iris camera are arranged such that a distance between the light source module and the iris camera is between a first threshold distance and a second threshold distance, the first threshold distance for generating a retina reflection region to have a specified size in the image of the iris, which is obtained by detecting, by the iris camera, the infrared rays reflected from a user's retina, the second threshold distance for generating a darkest portion to be displayed in an iris region in the image of the iris to have specified luminance.