Estimating a delay from a monitor output to a sensor

A system for estimating a time delay for synchronizing one or more parameters, comprising:

• one or more memories;
• and
• at least one processor each coupled to a least one of the memories and configured to:
• present a plurality of frames on a display device;
• modulate a brightness level in one or more frames of the plurality of frames;
• receive a plurality of image frames of a face of a user, wherein the plurality of image frames are obtained from a video stream recorded by an image sensor during the presentation of the plurality of frames on the display device;
• and
• process the plurality of image frames to determine the time delay between when the modulating the brightness level is performed in the one or more frames of the plurality of frames and when the modulating the brightness level in the one or more frames of the plurality of frames is reported by the image sensor.

A non-transitory computer-readable medium having instructions stored thereon that, when executed by at least one computing device, cause the at least one computing device to perform operations comprising:

• presenting a plurality of frames on a display device;
• modulating a brightness level in one or more frames of the plurality of frames;
• receiving a plurality of image frames of a face of a user, wherein the plurality of image frames are obtained from a video stream recorded by an image sensor during the presentation of the plurality of frames on the display device;
• and
• processing the plurality of image frames to determine a time delay between when the modulating the brightness level is performed in the one or more frames of the plurality of frames and when the modulating the brightness level in the one or more frames of the plurality of frames is reported by the image sensor.