Systems and methods for data representation in an optical measurement system

Patent metadata

Field	Value
Publication number	US-11941857-B2
Application number	US-202117324819-A
Country	US
Kind code	B2
Filing date	May 19, 2021
Priority date	May 26, 2020
Publication date	Mar 26, 2024
Grant date	Mar 26, 2024

Abstract

An illustrative method includes accessing, by a computing device, a model simulating light scattered by a simulated target, the model comprising a plurality of parameters. The method further includes generating, by the computing device, a set of possible histogram data using the model with a plurality of values for the parameters. The method further includes determining, by the computing device, a set of components that represent the set of possible histogram data, the set of components having a reduced dimensionality from the set of possible histogram data.

First claim

What is claimed is:

1. An optical measurement system comprising:
a detector configured to detect arrival times for photons scattered by a target; and
a processing unit configured to:
generate, based on the arrival times, histogram data associated with the target; and
generate, based on a set of components that represent a set of possible histogram data simulated using a model that simulates light scattered by a simulated target, a compressed representation of the histogram data.

2. The optical measurement system of claim 1 , wherein the generating the compressed representation comprises determining a set of weights that define a linear combination of the set of components to represent the histogram data.

3. The optical measurement system of claim 1 , wherein the processing unit is further configured to:
modify, based on the histogram data, the set of components.

4. The optical measurement system of claim 1 , wherein the processing unit is further configured to:
access the model, the model comprising a plurality of parameters;
generate the set of possible histogram data using the model with a plurality of values for the parameters; and
determine the set of components that represent the set of possible histogram data, the set of components having a reduced dimensionality from the set of possible histogram data.

5. The optical measurement system of claim 4 , wherein the plurality of parameters comprises at least one of an absorption coefficient or a scattering coefficient of the simulated target.

6. The optical measurement system of claim 4 , wherein:
the model comprises a modeled light source and a modeled detector for detecting the simulated light scattered by the simulated target; and
the plurality of parameters comprises a parameter representative of a distance between the modeled light source and the modeled detector.

7. The optical measurement system of claim 4 , wherein the determining the set of components comprises:
normalizing the set of possible histogram data to generate a normalized data set;
determining a covariance of the normalized data set; and
determining the set of components based on the covariance.

8. The optical measurement system of claim 4 , wherein the components comprise eigenvectors determined using principal component analysis (PCA).

9. The optical measurement system of claim 8 , wherein the set of components comprises a subset of the eigenvectors.

10. A method comprising:
generating, by a processing unit and based on arrival times of photons at a detector after the photons are scattered by a target, histogram data associated with the target; and
generating, by the processing unit and based on a set of components that represent a set of possible histogram data simulated using a model that simulates light scattered by a simulated target, a compressed representation of the histogram data.

11. The method of claim 10 , wherein the generating the compressed representation comprises determining a set of weights that define a linear combination of the set of components to represent the histogram data.

12. The method of claim 10 , further comprising modifying, by the processing unit and based on the histogram data, the set of components.

13. A wearable system for use by a user comprising:
a head-mountable component configured to be attached to a head of the user, the head-mountable component comprising an array of photodetectors configured to detect photons of light after the light reflects off a target within the head; and
a processing unit configured to:
generate, based on arrival times of the photons at the photodetectors, histogram data associated with the target; and
generate, based on a set of components that represent a set of possible histogram data simulated using a model that simulates light scattered by a simulated target, a compressed representation of the histogram data.

14. The wearable system of claim 13 , wherein the generating the compressed representation comprises determining a set of weights that define a linear combination of the set of components to represent the histogram data.

15. The wearable system of claim 13 , wherein the processing unit is further configured to modify, based on the histogram data, the set of components.

Assignees

• Hi Llc

Inventors

• Dehghani Hamid
• Field Ryan
• Kates-Harbeck Julian
• Rojkova Viktoria
• Chaturvedi Ashutosh

Classifications

• G06V10/141 Primary

  Control of illumination · CPC title

• G02B27/0172

  characterised by optical features · CPC title

• G06F18/10

  Pre-processing; Data cleansing · CPC title

• G06F18/2132

  based on discrimination criteria, e.g. discriminant analysis · CPC title

• G06F18/2135

  based on approximation criteria, e.g. principal component analysis · CPC title