Adaptive Calibration for Ambient Light Sensors
First Claim
1. An electronic device that is exposed to ambient light that has an ambient light color, comprising:
- a color sensing ambient light sensor that detects the ambient light and that produces a corresponding sensor output signal; and
control circuitry that determines a color converting matrix based on the detected ambient light and that converts the sensor output signal from a device-dependent color space to a device-independent color space using the color converting matrix to obtain an ambient light color value indicative of the ambient light color.
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Abstract
An electronic device may be provided with a display mounted in a housing. A color sensing ambient light sensor may measure the color of ambient light. The color sensing ambient light sensor may produce sensor output signals in a device-dependent color space. Control circuitry in the electronic device may convert the sensor output signals from the device-dependent color space to a device-independent color space using a color converting matrix. The color converting matrix may be determined using stored training data. The training data may include color data for different training light sources. The training data may be weighted to selectively control the influence of the training data on the color converting matrix. The training data may be weighted based on a distance between the training color data and a target color in the detected ambient light.
31 Citations
20 Claims
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1. An electronic device that is exposed to ambient light that has an ambient light color, comprising:
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a color sensing ambient light sensor that detects the ambient light and that produces a corresponding sensor output signal; and control circuitry that determines a color converting matrix based on the detected ambient light and that converts the sensor output signal from a device-dependent color space to a device-independent color space using the color converting matrix to obtain an ambient light color value indicative of the ambient light color. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for operating an electronic device having a color sensing ambient light sensor and control circuitry, comprising:
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with the color sensing ambient light sensor, producing a sensor output signal in response to receiving ambient light; and with the control circuitry, determining a target color based on the sensor output signal, computing a color converting matrix based on the target color, and converting the sensor output signal from a first color space to a second color space using the color converting matrix. - View Dependent Claims (12, 13, 14, 15)
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16. A method for calibrating a color sensing ambient light sensor in an electronic device, wherein the color sensing ambient light sensor comprises a plurality of photodetectors with different spectral responses, the method comprising:
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gathering spectral response data from the color sensing ambient light sensor; gathering spectral power distribution data for a plurality of light sources; processing the gathered spectral response data and the gathered spectral power distribution data to produce a first set of data corresponding to sensor output values for each of the light sources in a first color space and a second set of data corresponding to color values for each of the light sources in a second color space; and storing the first and second sets of data in the electronic device. - View Dependent Claims (17, 18, 19, 20)
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Specification