Patent ID: 8878999
Filing Date: 2014-11-04
Classification: G06K,H04N

Abstract:
1. A method of detecting the presence of additional graphics in a video signal, the method comprising: receiving a first video signal, at least one graphics signal, and a second video signal comprising said first video signal mixed at least periodically with the at least one graphics signal; deriving calculated values of pixels from a frame of the received first video signal and a corresponding frame of the received at least one graphics signal; comparing the calculated values with actual values of pixels of a corresponding frame of the received second video signal; and determining a presence status of the at least one graphics signal in the frame of the received second video signal based on the performed comparison; wherein receiving a first video signal, at least one graphics signal, and a second video signal comprising said first video signal mixed at least periodically with the at least one graphics signal further comprises receiving transparency information indicating transparency of at least a portion of a frame of an associated graphics signal, and said deriving calculated values of pixels from a frame of the received first video signal and a corresponding frame of the received at least one graphics signal further comprises deriving the calculated values from the received transparency information in addition to the frame of the received first video signal and the corresponding frame of the received at least one graphics signal.