Television – Bandwidth reduction system – Data rate reduction
Patent
1995-07-05
1997-03-18
Au, Amelia
Television
Bandwidth reduction system
Data rate reduction
348420, 382243, H04N 7133
Patent
active
056127430
ABSTRACT:
A method for adaptively selecting feature points according to motions of objects between the current frame and the reference frame, comprising: detecting a motion vector for each pixel in the current frame between the current frame and the reference frame; providing a pixel value from the reference frame based on the motion vector for each pixel in the current frame; subtracting the pixel value provided from the reference frame from a pixel value of said each pixel of the current frame to thereby provide a differential pixel value; comparing the differential pixel value with a threshold value TH and selecting regions having their respective differential pixel values larger than the threshold value TH; shifting the pixels within the selected regions to positions indicated by their respective motion vectors to thereby provide shifted regions; detecting edge points from the reference frame; determining processing regions from the shifted regions, wherein the shifted regions are overlapped with a portion of the edge points; generating a first grid on the reference frame and a second grid for each of the processing regions, wherein the second grid is formed by a portion of grid points of the first grid and newly added grid points; and selecting, as the feature points, a multiplicity of pixels in the reference frame based on the first and the second grids and the edge points.
REFERENCES:
patent: 5150432 (1992-09-01), Ueno et al.
patent: 5237410 (1993-08-01), Inoue
patent: 5247590 (1993-09-01), Fukuhara et al.
patent: 5373567 (1994-12-01), Takahashi et al.
patent: 5546129 (1996-08-01), Lee
Au Amelia
Daewoo Electronics Co. Ltd.
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