Patent ID: 6373892
Filing Date: 2002-04-16
Classification: G06T,H04N

Abstract:
A method for reproducing moving picture information from a compressed video signal, said compressed video signal including coded original video signal information including moving picture information to be digitized and added with a key signal indicative of background or foreground so as to cause values of signal levels indicative of the original video signal to be offset from a value of a signal level of the key signal indicative of background, said method comprising the steps of:decoding the compressed video signal; separating the key signal from the video signal in a comparison circuit, wherein said decoded video signal is compared with a preset threshold to judge whether or not the decoded video signal includes said key signal indicative of background and outputting the key signal indicative of contents corresponding to the judgement result; and performing a reverse transformation using a clipping circuit receiving as an input the decoded video signal, to extract a video signal other than the key signal, and using a correction circuit to correct the extracted video signal to cause offset level distances between the values of the original video signal and the value of the key signal to be restored to respective original values.