US9894420B2
патент
(57 ) (65) Prior Publication Data US 2016 /0373827 A1 Dec . 22, 2016 Related U . S . Application Data (63 ) Continuation of application No. 14 / 969,793, filed on Dec . 15 , 2015 , now Pat. No. 9 ,467,724 , which is a (Continued ) (51) Int. Ci. H04N 21/ 231 H04N 21/239
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