Patent ID: 8457199
Filing Date: 2013-06-04
Classification: H04N

Abstract:
1. An apparatus for coding video signals comprising: a video coder, a local decoder operable to produce a locally decoded picture, and a check signal generator configured to generate a check signal as a function of all the bits of the locally decoded picture, such that the check signal obtained in the presence of any single error is always different from that obtained from an error-free picture, wherein the video coder comprises a frame store for storing a locally decoded picture and inter-frame coder configured to generate a difference signal representing the differences between a picture to be transmitted and a predicted picture based on the stored locally decoded picture, the inter-frame coder is configured to perform predictive coding of pictures that are not to be used as a basis for predictive coding of another frame, and the local decoder is configured to decode such non- reference pictures so that the check signal generator generates check signals for them.