Recursive filtering of a video image

Details Recursive filtering of a video image Recursive filtering of a video image

H - Electricity

04

N

H04N 9/64 (2006.01) H04N 9/68 (2006.01) H04N 5/14 (2006.01) H04N 5/21 (2006.01)

Patent

CA 2586838

A method of recursive filtering of a video image includes storing an image 20 comprising picture elements. Luminance and chrominance weightings are assigned for weighting neighbouring picture elements to a picture element in a current image and for the stored image 20. A sum of differences is calculated between weighted luminance and chrominance values of a picture element and neighbouring picture elements of a current image and of corresponding picture elements of the stored image. The sum of differences is normalised to control sensitivity to motion in the image to obtain a value of a proportional parameter K(x,y) for each picture element. The current image is recursively filtered using the proportional parameter K(x,y) corresponding to each picture element by adding together a proportion K(x,y) of each picture element of the image to a complementary proportion of each corresponding picture element of the previously stored image.

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