Clock recovery for a coded light receiver
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United States of America Patent
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Oct 29, 2019
Grant Date -
Dec 13, 2018
app pub date -
Jun 10, 2016
filing date -
Jun 16, 2015
priority date (Note) -
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Abstract
An apparatus, method and program for receiving a coded light signal comprising a periodically repeating message repeating with a message period. A portion of the message is received in each of a plurality of frames captured by a rolling-shutter camera, with different portions being received in different frames. Using each of a discrete group of trial values of the message period, the respective trial value is used to reconstruct a respective first version of the message from the portions received in a first subset of said frames, and to reconstruct a respective second version of the message from the portions received in a second subset of said frames. For each of the trial values, there is generate a respective value of a measure of similarity between the respective reconstructed first and second versions of the message. An estimate of the message period is determined based on this.
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