Patent ID: 9607349
Date: 2017-03-28
CPC Classifications: G06K,G06T,H04N

Claim:
1. A method for determining a set of modifiable elements of a coded bit-stream representative of an audio video content, said method comprising for a part of said coded bit-stream coding a group of pictures: determining a set of candidate modifiable elements, wherein a candidate modifiable element comprises a modified value for a segment of the coded bit-stream at a given location and a spatial propagation map associated with said modified value, said spatial propagation map comprising pixels whose decoding is impacted when said modified value is placed in the coded bit stream at said given location; determining a heat map for each reference frame comprising, for each pixel of said reference frame, an information representative of the usage of said pixel for temporal prediction during the decoding of said part of said coded bit-stream coding a group of pictures; obtaining a set of modifiable elements among said set of candidate modifiable elements, wherein a modifiable element has a spatial propagation map that does not overlap with corresponding heat map.