Patent ID: 6281942
Filing Date: 2001-08-28
Classification: H04N

Abstract:
A method for filtering at least a portion of a digital video signal, the method comprising:calculating a pixel variance for a block of source pixels from a current frame of the motion video image;applying a heavy spatial filter to the block of source pixels to form a block of spatially filtered pixels representing current subject matter of the current frame when the pixel variance is less than a first pixel variance threshold;applying a light spatial filter to the block of source pixels to form the block of spatially filtered pixels when the pixel variance is less than a second pixel variance threshold;calculating a pixel error between the block of spatially filtered pixels and a block of pixels of a previous frame of the digital video signal;applying a heavy temporal filter to the block of spatially filtered pixels when the pixel error is less than a first pixel error threshold; andapplying a light temporal filter to the block of spatially filtered pixels when the pixel error is less than a second pixel error threshold.