Method and apparatus for determining feature points

Details Method and apparatus for determining feature points Method and apparatus for determining feature points

1995-05-04

1997-12-02

Couso, Jose L.

Image analysis

Pattern recognition

Feature extraction

382199, 382236, 348413, 348416, G06K 946

Patent

active

056944870

ABSTRACT:
A method for determining feature points comprises a step for (a) providing directional gradients and a gradient magnitude for each pixel in the video frame, (b) normalizing the directional gradients by dividing the directional gradients with the gradient magnitude, (c) generating a first edge map having the gradient magnitude for each pixel, (d) generating a second edge map having the normalized direction gradients for each pixel, (e) dividing the first edge map into a plurality of blocks of an identical size, (f) providing, for each of the pixels included in each of the blocks, normalized directional gradients for a set of a predetermined number of pixels from the second edge map, (g) obtaining a variance for each of the pixels included in each of the blocks based on the provided normalized directional gradients, (h) determining a feature point for each of the blocks based on the gradient magnitude and variance corresponding to each of the pixels therein.

REFERENCES:
patent: 4817174 (1989-03-01), Nakatani
patent: 4910786 (1990-03-01), Eichel
patent: 5144688 (1992-09-01), Bovir et al.

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