Method for encoding a video signal using feature point based mot

Details Method for encoding a video signal using feature point based mot Method for encoding a video signal using feature point based mot

1995-07-05

1996-08-13

Britton, Howard W.

Television

Bandwidth reduction system

Data rate reduction

348699, H04N 7133, H04N 7137

Patent

active

055461298

ABSTRACT:
A method for adaptively selecting feature points according to motions of objects between the current frame and the previous frame, comprising the steps of: subtracting a pixel value of the previous frame from a pixel value of the current frame to thereby provide a differential pixel value; comparing the differential pixel value with a first threshold value TH1 and selecting processing regions having differential pixel values larger than the first threshold value TH1; detecting a motion vector for each pixel of the processing region in the previous frame; providing a pixel value of the current frame based on the motion vector for each pixel of the processing region in the previous frame; subtracting a pixel value of said each pixel of the processing region in the previous frame from the pixel value of the current frame to thereby provide an error pixel value; comparing the error pixel value with a second threshold value TH2 and selecting grid regions having error pixel values larger than the second threshold value TH2; generating a first grid for each of the processing regions in the previous frame and generating a second grid for said each of the grid regions; detecting edge points from the previous frame; and selecting, as the feature points, a multiplicity of pixels in the previous frame based on the first and the second grids and the edge points.

REFERENCES:
patent: 5046071 (1991-09-01), Tanoi
patent: 5150432 (1992-09-01), Ueno et al.
patent: 5237410 (1993-08-01), Inoue
patent: 5317397 (1994-05-01), Odaka et al.
patent: 5351083 (1994-09-01), Tsukagoshi
patent: 5398068 (1995-03-01), Liu et al.

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