Patent ID: 8139649
Filing Date: 2012-03-20
Classification: H04N

Abstract:
1. A method of recursive filtering a video image comprising the steps of: a. determining, using a computer system, a local variance σ b. selecting, using the computer system, an estimated value of noise variance σ c. obtaining, using the computer system, a surface for value of a proportional parameter K from the equation where 1≦σ≦128, 1≦σ and ρ, τ, α and β are empirical constants; d. electing, using the computer system, a value of λ to scale a relative contribution to the value of the proportional parameter K by the luminosity variance and the noise variance; and e. recursively filtering, using the computer system, the image using the proportional parameter K to sum proportions of the current image and an immediately preceding image.