US 11,378,456 B2 · System and method for calibrating a light color sensor

Abstract

A method and an ambient light color sensor adapted to determine color of ambient light comprising a memory, a processor, and a light color sensor with a plurality of channels that detect light at different wavelengths. Wherein the memory comprises a calibration matrix determined by calibrating a test light color sensing device under at least one ambient lighting condition, and a normalized gain value for each channel determined by calibrating the ambient light color sensing device to an artificial light source. Wherein the processor receives the sensor readings from the light color sensor, normalizes each received sensor reading using the normalized gain value of a respective channel, determines at least one measured light color value that quantifies color of light from the normalized sensor readings, and determines at least one calibrated light color value by correlating the at least one measured light color value through the calibration matrix.

Claims23

Dependent claims

An ambient light color sensing device adapted to determine color of ambient light comprising:

a light color sensor comprising a plurality of channels that detect light at different wavelengths to produce sensor readings;
a memory comprising a calibration matrix and a normalized gain value for each channel, wherein the calibration matrix is determined by calibrating a test light color sensing device under at least one ambient lighting condition, and wherein each normalized gain value is determined by calibrating the ambient light color sensing device to an artificial light source;
and
at least one processor, wherein the at least one processor:
receives the sensor readings from the light color sensor;
normalizes each received sensor reading using the normalized gain value of a respective channel;
determines at least one measured light color value that quantifies color of light from the normalized sensor readings;
and
determines at least one calibrated light color value by correlating the at least one measured light color value through the calibration matrix.

6 more elements

A method of calibrating an ambient light color sensing device to determine color of ambient light, wherein the ambient light color sensing device comprises a light color sensor comprising a plurality of channels that detect light at different wavelengths to produce sensor readings, wherein the method comprises the steps of:

determining a calibration matrix by calibrating a test light color sensing device under at least one ambient lighting condition;
determining a normalized gain value for each channel by calibrating the ambient light color sensing device to an artificial light source;
and
storing the calibration matrix and the normalized gain values at the ambient light color sensing device;
receiving sensor readings from the light color sensor;
normalizing each received sensor reading using the normalized gain value of a respective channel;
determining at least one measured light color value that quantifies color of light from the normalized sensor readings;
and
determining at least one calibrated light color value by correlating the at least one measured light color value through the calibration matrix.

6 more elements

Dependencies are inferred from the claim text.

System and method for calibrating a light color sensor

Life of this patent

System and method for calibrating a light color sensor

Life of this patent

Abstract

Claims23