Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1994-10-14
1996-03-19
Groody, James J.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
348407, 348699, 382275, H04N 5213
Patent
active
055006850
ABSTRACT:
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.
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AVT Communications Limited
Groody James J.
Murrell Jeffrey S.
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