Importance

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Abstract

A method of tracking the position of a body part, such as a hand, in captured images, the method comprising capturing (10) colour images of a region to form a set of captured images; identifying contiguous skin-colour regions (12) within an initial image of the set of captured images; defining regions of interest (16) containing the skin-coloured regions; extracting (18) image features in the regions of interest, each image feature relating to a point in a region of interest; and then, for successive pairs of images comprising a first image and a second image, the first pair of images having as the first image the initial image and a later image, following pairs of images each including as the first image the second image from the preceding pair and a later image as the second image: extracting (22) image features, each image feature relating to a point in the second image; determining matches (24) between image features relating to the second image and image features relating to in each region of interest in the first image; determining the displacement within the image of the matched image features between the first and second images; disregarding (28) matched features whose displacement is not within a range of displacements; determining regions of interest (30) in the second image containing the matched features which have not been disregarded; and determining the direction of movement (34) of the regions of interest between the first image and the second image.

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First Claim