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    Setting white point based on display temperature
    2.
    发明授权
    Setting white point based on display temperature 有权

    公开(公告)号：US11227528B2

    公开(公告)日：2022-01-18

    申请号：US16888043

    申请日：2020-05-29

    Applicant: Microsoft Technology Licensing, LLC

    Inventor： Abhijit Sarkar ,  Dmitry Reshidko ,  Tuomas Heikki Sakari Vallius

    IPC: H04N9/73 ,  G09G3/20 ,  G09G3/32 ,  G02B27/01

    Abstract: A method for setting a display white point comprises displaying images with a display including at least a first light source and a second light source. The first light source is configured to emit light having a first color and having a first temperature-dependent luminance change. The second light source is configured to emit light having a second color and having a second temperature-dependent luminance change. An internal display temperature is measured. Based on the internal display temperature being a first temperature, a first target white point is set to prioritize color accuracy. Based on the internal display temperature being a second temperature, greater than the first temperature, a second target white point is set to prioritize luminance output.

    Color sensing ambient light sensor calibration
    3.
    发明授权
    Color sensing ambient light sensor calibration 有权

    公开(公告)号：US10648862B2

    公开(公告)日：2020-05-12

    申请号：US15944771

    申请日：2018-04-03

    Applicant: MICROSOFT TECHNOLOGY LICENSING, LLC

    Inventor： Abhijit Sarkar ,  Samu Matias Kallio ,  Kari Jussi Ropo

    IPC: G01J3/02 ,  G01J3/50 ,  G01J3/46 ,  G01J1/42 ,  G01J1/44 ,  G01J3/52 ,  G01J3/51 ,  G01J1/04

    Abstract: Sensor calibration methods and systems can for providing accurate color values are disclosed. In one example, a method includes obtaining color measurements that indicate an amount of ambient light, as well as clustering the color measurements, and storing cluster parameters for the clustered color measurements. The method can further include automatic calculation of, for each cluster, generic transformation parameters for conversion of a color measurement to a calibrated color value. In another example, a method can include exposing a light sensor to a calibration ambient lighting, calculating sensor correction parameters for the light sensor, and storing the calculated parameters. As an additional example, an electronic device is adapted to determine calibrated color values with machine readable media storing cluster parameters, sensor correction parameters, and generic transform parameters used by the electronic device to calculate calibrated color values for ambient light sensor measurements.

    Use of multiple calibrated ambient color sensor measurements to generate a single colorimetric value
    4.
    发明授权
    Use of multiple calibrated ambient color sensor measurements to generate a single colorimetric value 有权

    公开(公告)号：US10345151B1

    公开(公告)日：2019-07-09

    申请号：US15969735

    申请日：2018-05-02

    Applicant: MICROSOFT TECHNOLOGY LICENSING, LLC

    Inventor： Abhijit Sarkar ,  Stefan Angelevski ,  Samu Matias Kallio ,  Hiroo Umeno

    IPC: G01J1/42 ,  G01J3/46 ,  G01J3/50

    Abstract: Systems and methods for determining a colorimetric value from color measurements for multiple ambient color sensors which for each color measurement, in various approaches, select a lighting cluster similar to the color measurement and determine whether the color measurement is valid or invalid based on a calculated similarity between the color measurement and the selected lighting cluster, calculate a weight for the color measurement for combination with other color measurements based on the calculated similarity between the color measurement and its selected lighting cluster, determine whether the color measurement is valid or invalid based on perceptual color space distances for the color measurement for multiple reference light sources, and/or calculate a weight for the color measurement for combination with other color measurements based on the perceptual color space distances for multiple reference light sources.

    Color conversion for ambient-adaptive digital content
    7.
    发明授权
    Color conversion for ambient-adaptive digital content 有权

    公开(公告)号：US10715774B2

    公开(公告)日：2020-07-14

    申请号：US16043017

    申请日：2018-07-23

    Applicant: Microsoft Technology Licensing, LLC

    Inventor： Abhijit Sarkar ,  Zhenhuan Wen

    IPC: H04N7/14 ,  H04N9/73 ,  H04N5/44 ,  H04N9/77 ,  G06T7/90

    Abstract: A method for digital image color conversion includes, at a first computing device, capturing a first digital image of a first real-world environment. Based on ambient lighting conditions of the first real-world environment, a first ambient lighting-agnostic digital image is generated using a capture-side ambient lighting color conversion. The first ambient lighting-agnostic digital image is transmitted to a second computing device in a second real-world environment. From the second computing device, a second ambient lighting-agnostic digital image is received, the second image having been generated by the second computing device from a second digital image using the capture-side ambient lighting color conversion. Based on the ambient lighting conditions of the first real-world environment, a lighting-corrected digital image is generated from the second ambient lighting-agnostic digital image using a display-side ambient lighting color conversion. The lighting-corrected digital image is displayed on the first computing device.

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