Pupil Dilation Lie Detector Using Image Sensor

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Solution Overview

Problem

Polygraphs face challenges in detecting deception due to autonomic reactions being influenced by factors other than lying, and are intrusive, requiring expert examiners and taking hours, making them unsuitable for crowd screening or field use.

Innovation Solution

A system using an image sensor to capture pupil images, a processor to determine pupil size, and a controller to output specific audio sentences, comparing pupil dilation responses to determine deceptiveness by distinguishing between significant and non-significant reactions to targeted sentences.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional polygraph methods are used to detect deception, then physiological indicators of stress can be measured, but the capability to detect liars with high sensitivity and specificity decreases due to autonomic reactions from other factors

Engineering Contradiction:

Improvedeception detection accuracyVSAvoidspecificity of lie detection

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent extracts and isolates a specific physiological indicator (pupil dilation) from the complex set of autonomic reactions measured by traditional polygraphs. By focusing exclusively on pupil diameter changes in response to specific stimuli sentences, the system eliminates interference from other autonomic reactions such as sweating, heart rate changes, and breathing patterns that reduce detection specificity.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies local quality by targeting a specific region (the pupil) and a specific type of response (dilation to cognitive stimuli) rather than measuring general physiological stress. The system presents specific sentences designed to trigger cognitive processing and measures the localized pupil response, creating a more precise indicator of deception that is less susceptible to general emotional states.

Inventive Principle:

Principle #3Local quality

2Reliability

If traditional polygraph examinations are conducted, then deception can be detected through physiological monitoring, but the process is intrusive and requires expert examiners taking hours

Engineering Contradiction:

Improvedeception detection capabilityVSAvoidexamination duration

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent segments the deception detection process into a simplified format using brief sentences (5-20 words) presented in sequence. Instead of hours of continuous questioning and monitoring, the system uses a condensed set of stimulus sentences that can be administered quickly, reducing examination time while maintaining detection capability through focused measurement of pupil responses to critical stimuli.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent enables self-administered or automated deception detection by eliminating the need for expert examiners to interpret complex physiological data. The system automatically presents sentences, captures pupil diameter changes, and analyzes the data using predefined algorithms, allowing the device to serve itself without requiring specialized human expertise for operation or interpretation.

Inventive Principle:

Principle #25Self-service

3Reliability

If traditional polygraph systems are used, then physiological responses can be monitored, but the systems cannot be used for screening crowds or for working in the field

Engineering Contradiction:

Improvedeception detection functionVSAvoidsuitability for crowd screening and field use

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent replaces the complex mechanical and physiological monitoring system of traditional polygraphs with an optical measurement system using an image sensor to capture pupil diameter. This substitution creates a simpler, more portable device that can be easily deployed in field conditions and used for rapid screening of multiple individuals without requiring controlled laboratory environments or extensive equipment setups.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 approach allows for non-intrusive, efficient detection of deception by analyzing pupil dilation responses to specific audio stimuli, providing a more accurate and rapid assessment compared to traditional polygraph methods.

Implementation Method 1

an image sensor configured to capture a plurality of sequential images of the testee's pupil

Methodology Applied

Scientific EffectOptical reflection and absorption: Reflection

Implementation Method 2

monitor changes in the determined size of the testee's pupil during the outputting of the first-type sentence and the plurality of second-type sentences

Methodology Applied

Scientific EffectPupil dilation:

Data Source

PatentUS11457847B2Lie detector based on monitoring of pupil dilation

Publication Date: 2022.10.04 EYE MINDERS LTD

AI summary

Deception can be evaluated by presenting a set of sentences or words to a testee, including some sentences or words that are expected to evoke significant pupil dilation in a testee who is lying and other sentences or words that are not expected to evoke significant pupil dilation in the testee. Changes in the testee's pupil size are compared to ascertain whether a pupil-dilation response to certain sentences or words is larger than for other sentences or words, and an indication of deceptiveness or non-deceptiveness is output based on the results of the ascertaining.