Pupil evaluation using modulated in-line illumination

A pupillary, coaxial technique, applied in the field of pupillary features, which can solve the problem that the contrast is not so obvious, and the pupil detection technique is not accurate or effective

Pending Publication Date: 2022-03-29
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such pupil detection techniques may not be accurate or effective, esp

Method used

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  • Pupil evaluation using modulated in-line illumination
  • Pupil evaluation using modulated in-line illumination
  • Pupil evaluation using modulated in-line illumination

Examples

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Embodiment Construction

[0024] Numerous details are described in order to provide a thorough understanding of example implementations shown in the accompanying drawings. However, the appended drawings illustrate only some example aspects of the disclosure and are therefore not to be considered limiting. One of ordinary skill in the art will understand that other effective aspects and / or variations do not include all of the specific details described herein. Furthermore, well-known systems, methods, components, devices, and circuits have not been described in detail so as not to obscure more relevant aspects of the example implementations described herein.

[0025] A pupil characteristic assessment system includes a light source, an image sensor, and a processor that performs pupil characteristic assessment based on data received from the light sensor regarding light reflected off the user's eye from the light source. In various implementations, pupil characteristics are determined using on-axis illu...

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Abstract

Various embodiments use in-line illumination to determine pupil features (e.g., perimeter location, pupil shape, pupil diameter, pupil center, etc.). Coaxial illumination involves generating light from a light source substantially coaxial with an image sensor configured to capture reflections of the light from the light source from the eye. Light from the light source may enter the eye through the pupil and reflect from the retina to produce a bright pupil-type light pattern in data obtained by the image sensor. The light may be pulsed at a frequency such that frequency segmentation may be used to distinguish reflections through the pupil out of the retina from reflections of light from other light sources. In some embodiments, the image sensor is an event camera that detects an event. Pupil features may be evaluated by evaluating events that occur repeatedly in a given area at a given frequency.

Description

technical field [0001] The present disclosure relates generally to assessing characteristics of the pupil of an eye, and more particularly to systems, methods and apparatus for assessing pupil characteristics using light reflected from the eye. Background technique [0002] Some existing systems use light reflected from the surface of the eye to estimate eye features. For example, such techniques may use multiple flashes to identify the user's eye shape, position, and orientation to estimate the user's gaze direction. Existing pupil detection techniques can use an image sensor and integrate the light intensity level over an exposure period to produce a grayscale image, and then attempt to use the grayscale image to detect the pupil. The pupil is detected based on the grayscale contrast between the pupil area and the surrounding iris area, thus relying on the presence of significant contrast between the pupil and the iris. Such pupil detection techniques may not be accurate...

Claims

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Application Information

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IPC IPC(8): A61B3/11A61B3/113A61B3/00G02B27/01G06V40/19G06V10/141G06V10/145G06V10/147
CPCA61B3/112A61B3/113A61B3/0008G02B27/0172G06V40/19G06V10/145G06V10/141G06V10/147
Inventor W·尼斯迪克
Owner APPLE INC
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