Video processing system and method

Abstract

A method of calculating a transform matrix for transforming points in a model of an object to an image of the object captured by a camera. The camera produces a two dimensional view of the object, the object having a plane, which includes a plurality of lines defining features on the plane of the object. The method comprises identifying a plurality of triplets of points on the lines of the object in the image from the camera, each of the triplets of points providing three or more non co-linear points on the lines of the object. The method includes identifying a sample triplet of points in the model, for each of the identified plurality of triplets of points, calculating a transform matrix which will transform the sample triplet from the model onto the identified triplet of points from the camera image, for each of the identified transform matrices, calculating a transform matrix for transforming a plurality of points on the lines of the object from the model to the image, calculating a comparison metric between the points transformed from the lines of the plane of the object in the model and corresponding points in the image view of the object, and identifying the transform matrix which produces the best comparison metric. The identified transform matrix can therefore be used to transform points on the model into the image produced by the camera, or points in the image onto the model.