Patent ID: 6587509
Filing Date: 2003-07-01
Classification: H04N

Abstract:
A method for reducing undesirable effects of a filtering operation occurring after a decoding operation of a moving image represented by an encoded compressed signal, said filtering operation including an emphasis processing operation which causes improvement of some aspects of said moving image and also causes deterioration of other aspects of said moving image by unintentionally emphasizing signal encoding and compressing operations, said method comprising the steps of:receiving and decoding said encoded compressed signal to obtain a decoded uncompressed signal having at least a luminance signal component; generating a random number; generating a noise signal as a function of said luminance signal component and said random number; adaptively combining said noise signal and said decoded uncompressed signal such that the undesirable effects of said emphasis processing operation are reduced; detecting a level of the combined decoded uncompressed signal and noise signal; and adjusting said level in accordance with a predetermined signal level.