[특허]Wiener filter for filtering noise from a video signal

Wiener filter for filtering noise from a video signal 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04N-005/213
출원번호	US-0323507 (1994-10-14)
우선권정보	GB-0021372 (1993-10-15)
발명자 / 주소	Kokaram Anil C. (Cambridge GBX)
출원인 / 주소	AVT Communications Limited (London GBX 03)
인용정보	피인용 횟수 : 45 인용 특허 : 0

초록 ▼

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.

대표청구항 ▼

A method of removing noise from a current frame f of an image sequence having a plurality of frames, the method comprising the steps of: (a) applying a motion compensation process to at least one of a frame preceding and a frame succeeding the current frame in said image sequence; (b) selecting a zone in said current frame; (c) selecting, using motion compensation data from step (a), substantially the same zone of the at least one of the said preceding and succeeding frames, thus to define with said zone of the current frame a three-dimensional data set of pixels; (d) converting the data set to the frequency domain by applying a 3D fast Fourier transform (FFT) process to the said data set to produce a plurality of frequency components (bins) thereof; (e) applying a Wiener filtering operation to attenuate the said frequency components (bins); (f) applying the inverse of the said 3D FFT process to produce restored pixels of the said current frame f. A method of removing noise from a current frame f of an image sequence having a plurality of frames, the method comprising: Fourier transforming the values of a plurality of pixels in the current frame f to obtain a data set; applying a Wiener filtering operation to said data set to attenuate frequency components within the data set as a function of the difference between the spectral power density of Phhgg of the data set when Pgg is greater than bhhb1; and when Pgg is less than bhhgg reduces. A digital filter for removing noise from a current frame f of an image sequence having a plurality of frames, the filter comprising: (a) means for applying a motion compensation process to at least one of a frame preceding and a frame succeeding the current frame in said image sequence; (b) means for selecting a zone in said current frame; (c) means for selecting, using motion compensation data from said applying means, substantially the same zone of the at least one of the said preceding and succeeding frames to define with said zone of the current frame a three-dimensional data set of pixels; (d) means for converting the data set to the frequency domain by applying a 3D fast Fourier transform (FFT) process to the said data set to produce a plurality of frequency components (bins) thereof; (e) means for applying a Wiener filtering operation to attenuate the said frequency components (bins); and (f) means for applying the inverse of the said 3D FFT process to produce restored pixels of the said current frame f.

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Wiener filter for filtering noise from a video signal 원문보기

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