05500685 is referenced by 48 patents and cites 8 patents.

A digital Wiener filtering method is proposed which applies motion compensation by successive approximations of increasing resolution to determine displacement vectors for two successive image frames, a vectors defining a real displacement only being applied to a block of one of the frames when the mean absolute error associated with that vector is not greater than a given fraction of the mean absolute error between that block and the corresponding block of the other frame. The current frame is then filtered block-by-block, with the blocks overlapping. In this filtering, each block is a 3D volume of pixels from the current frame and blocks selected from the preceding and succeeding frames so as to correspond according to the displacement vectors. In one embodiment, the filtering comprises applying a 3D FFT to convert to a power spectrum in the frequency domain, followed by attenuation according to a Wiener filter and conversion from the frequency domain by the inverse FFT.

Title
Wiener filter for filtering noise from a video signal
Application Number
8/323507
Publication Number
5500685
Application Date
October 14, 1994
Publication Date
March 19, 1996
Inventor
Anil C Kokaram
Cambridge
GB
Agent
Schwegman Lundberg & Woessner
Assignee
AVT Communications
GB
IPC
H04N 7/13
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