Image analysis – Image compression or coding – Interframe coding
Patent
1995-07-31
1997-09-30
Boudreau, Leo
Image analysis
Image compression or coding
Interframe coding
382232, 382243, 348416, 348699, G06K 936, H04N 141
Patent
active
056733399
ABSTRACT:
A method for providing an accurately predicted current frame, comprising the steps of: selecting feature points in the previous frame and detecting a first set of motion vectors for the feature points; defining quadrangles by connecting the feature points; defining horizontally split triangles by splitting quadrangles and calculating a variance for each triangle and comparing the variance to select the smallest variance as first variance; defining vertically split triangles by splitting the quadrangles and calculating the variance for each triangle and comparing the variance to select the smallest variance value as second variance value; comparing the first and the second variance and selecting the smaller variance as a third variance and providing triangle information representing the split direction for the third variance; determining quasi-feature points on the current frame and a second set of motion vectors for the quasi-feature points; defining quadrangles formed by connecting the quasi-feature points, and splitting each quadrangle into two triangles; determining a predicted position on the previous frame for pixel contained in triangle of the current frame; determining a third set of motion vectors for the pixels contained in triangle of the current frame; and providing value of each pixel to be contained in the predicted current frame by using the second and the third set of motion vectors.
REFERENCES:
patent: 5089887 (1992-02-01), Robert et al.
patent: 5295201 (1994-03-01), Yokohama
patent: 5486862 (1996-01-01), Yagasaki
patent: 5548667 (1996-08-01), Tu
patent: 5552823 (1996-09-01), Kageyama
Boudreau Leo
Chen Wenpeng
Daewoo Electronics Co. Ltd.
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