Patent ID: 7733954

Claim:
Method of decoding a video image stream arising in the form of a video image coded stream comprising a coding signature representing first encoding constraints and coding parameters allowing the reconstruction of the video image stream, said coding signature being identified in said coded stream as a data item to be retained with a view to a subsequent recoding, said method of decoding comprising the steps of: decoding said video image coded stream into a decoded signal, using a video decoder; including in the decoded signal some of the coding parameters which are used during the previous coding with a view to a subsequent reuse of said parameters; incorporating, during decoding step, the coding signature into the decoded signal among the some of the coding parameters, wherein the method of decoding further comprises the steps of: associating, during the decoding step, at least one decoding signature representative of at least one zone of each decoded image of the stream, said decoding signature being a word of n bits corresponding to a modular reduction of the sum of all the bits of the luminance and chrominance levels of the image zone; and placing this signature in the decoded signal with the coding parameter.