Patent ID: 6738528
Filing Date: 2004-05-18
Classification: H04N

Abstract:
A block noise detecting apparatus for detecting, from a digital video signal subjected to lossy encoding on a predetermined image block basis, block noise caused by decoding the video signal, said block noise detecting the apparatus comprising:signal extracting means for receiving the video signal and extracting a high frequency component from the video signal; absolute value taking means for taking an absolute value of a high frequency component signal outputted from said signal extracting means; accumulating/adding means for accumulating/adding an absolute value signal outputted from said absolute value taking means for a predetermined period; periodicity detecting means for detecting periodicity of the block noise in accordance with an accumulation/addition result outputted from said accumulating/adding means; and block boundary determining means for determining a block boundary, where the block noise is generated, from a periodic signal detected by said periodicity detecting means.