Determination of chromatic iso-luminance information for controlling a computer process in a personalised manner
Inventors
Pouget, Pierre • GENIN, Alexis
Assignees
Centre National de la Recherche Scientifique CNRS • Assistance Publique Hopitaux de Paris APHP • Institut National de la Sante et de la Recherche Medicale INSERM • Sorbonne Universite • Institut du Cerveau et de La Moelle Epiniere ICM
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Publication Number
US-11464407-B2
Publication Date
2022-10-11
Expiration Date
Abstract
A method for generating an indicator or biomarker of colour perception in a mammalian subject, where the method may include submitting the mammalian subject to a multicoloured dynamic stimulus comprising displaying, on a display device. The method may include controlling a change over time of at least one of the two colours of the multicolour pattern when displaying the dynamic multicolour stimulus, to vary the displayed luminance of this colour (usually several times). The method may include acquiring, by using an image acquisition device, an oscillatory response of a pupil of the mammalian subject. The method may include generating, from the acquired response, a signal representative of the power of the pupil's oscillatory response as a function of the change over time of at least one of the two colours when displaying the dynamic multicoloured stimulus.
Core Innovation
The invention relates to a mammalian colour-perception evaluation method that determines chromatic iso-luminance information for an individual using a dynamic multicolour stimulus. The dynamic multicolour stimulus displays a multicolour pattern on a display device, where at least two colours are periodically inverted at a marking frequency, while the displayed luminance of at least one colour and a luminance difference between the colours change over time.
An image acquisition device acquires an oscillatory response of at least one pupil of the individual during presentation of the dynamic multicolour stimulus. From the acquired oscillatory response, the method generates a signal representative of a power of the oscillatory response as a function of the change over time of the colours and the difference in luminance between the colours, and identifies a bicolour iso-luminance configuration corresponding to a minimum of the power signal.
The determined chromatic iso-luminance information is used as input data of a personalised computer process. The document further describes using the iso-luminance information to calibrate or correct a computer display based on chromatic iso-luminance values and to improve personalised user identification/authentication by comparing determined iso-luminance information with reference chromatic iso-luminance information stored in computer memory for an individual identifier.
Claims Coverage
The partial document provides two independent claims. The inventive features are centered on determining chromatic iso-luminance information from oscillatory pupil responses to a dynamic multicolour stimulus and using that information as input data to a computer process control module.
Personalised computer-process control using chromatic iso-luminance from pupil oscillations
A method for controlling a computer process in a personalised manner by determining at least one chromatic iso-luminance information for an individual using a dynamic multicolour stimulus with periodically inverted colours, acquiring an oscillatory pupil response, generating a signal representative of oscillatory power as a function of time-varying colour changes and luminance difference, defining the bicolour iso-luminance configuration as a minimum of the power signal, and using the chromatic iso-luminance information to determine input data of the computer process.
Personalised system with iso-luminance determination and process control module
A system that personalises computer-process control by providing a subsystem for determining at least one chromatic iso-luminance information for an individual and a process control module configured to use the chromatic iso-luminance information to determine input data of the computer process, where the iso-luminance determination subsystem includes a display device, a computer module generating the dynamic multicolour stimulus with periodically inverted colours, a colour controller changing luminance and luminance difference over time, an image acquisition device acquiring the oscillatory pupil response, an indicator/biomarker generator producing a signal representative of oscillatory power as a function of colour changes over time and luminance difference, and an iso-luminance determination unit selecting the bicolour iso-luminance configuration corresponding to a minimum of the power signal.
Across the independent claims, the main inventive coverage is the determination of chromatic iso-luminance information from a minimum of an oscillatory pupil-power signal obtained during dynamic multicolour stimulation, and the use of that iso-luminance information as input to a personalised computer process.
Stated Advantages
Reduced equipment and processing compared with optokinetic nystagmus.
Robustness to noise.
Use of conventional ~25 fps cameras.
Avoidance of subject-dependent calibration.
Improved security versus spoofable biometrics because the pupil response implies the subject is alive.
Documented Applications
Personalised computer process control based on determining chromatic iso-luminance information for an individual.
Display calibration/correction of a computer system display screen using at least one chromatic iso-luminance information.
Improving user identification/authentication security by comparing determined chromatic iso-luminance information against stored reference chromatic iso-luminance values for an individual identifier.
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