Patent ID: 8406311
Filing Date: 2013-03-26
Classification: G06T,H04N

Abstract:
1. A method for embedding an electronic watermark in an MPEG stream, said method comprising the steps of: detecting an intra-macroblock of an I-frame, or a P or B-frame, in an MPEG stream; extracting data for one macroblock from said MPEG stream and buffering said data when said intra-macroblock of said I-frame, or said P or B-frame, is detected; embedding an embedding pattern in said data, while said data is buffered, without changing the length of VLC; and returning said data, in which said embedding pattern has been embedded, to said MPEG stream; said embedding comprising determining whether ½ of said embedding pattern can be embedded when said bit length will be changed, and for embedding said ½ of said embedding pattern in said data when embedding is feasible.