Patent ID: 7903901

Claim:
A recursive filter system for a video image comprising: a. memory storage means arranged to store a first image of stored picture elements S(x,y); b. weighting means arranged to generate weighted values W(x,y) of luminance and chrominance of a stored picture element S(x,y) by summing weighted values B(x,y)·S(x,y) of luminance and chrominance of the picture element and neighbouring picture elements; c. generating means arranged to generate a first proportional parameter A(x,y) for the stored picture element based on a modular sum of differences between luminance and chrominance of the stored picture element and of surrounding picture elements; d. first combinatorial means arranged to use the first proportional parameter A(x,y) to generate a weighted picture element M(x,y) from a proportion of the stored picture element S(x,y) and a complementary proportion 1−A(x,y) of the weighted value W(x,y); e. inputting means arranged to input picture elements of a next image and a second proportional parameter K; f. second combinatorial means arranged to use the second proportional parameter K to generate a filtered image R(x,y) by combining a proportion of each input picture element C(x,y) of the next image with a complementary proportion 1−K of the weighted stored picture element M(x,y) of the first image and to store the filtered image in the storage means.