Patent ID: 6999634
Filing Date: 2006-02-14
Classification: G06T,Y10S

Abstract:
1. A spatio-temporal joint filter for noise reduction comprising: a spatial joint filter including a first filter connected to an input determining a first weighted average of current support region signals of said input using first weighting factors, said current support region signals being included in a current frame, and a second filter connected to said input and an output of said first filter determining a second weighted sum of said input signal and said first weighted average using a second weighting factor that depends on an original signal variance and a noise variance; a temporal joint filter including a third filter connected to an output of said second filter determining a third weighted average of said second weighted sum and previous support region signals of said input signal using third weighting factors, said previous support region signals being included in a previous frame, and a fourth filter connected to an output of said second filter determining a fourth weighted sum of said second weighted sum and said third weighted average using a fourth weighting factor that depends on a spatio-temporal signal variance and said noise variance wherein said fourth weighted sum f where f μ σ σ where σ f a frame memory storing said fourth weighted sum and feedbacking said fourth weighted sum to said third filter for a next frame.