Patent ID: 7379565

Claim:
Method for determining the displacement of a pixel between a first and a second synthesis image, said images being constituted by a set of pixels, the first image being synthesised from a first scene containing an object and a given viewpoint, and the second image being synthesised from a second scene containing the same object, this second scene being obtained from the first scene by moving the object in the first scene and/or moving the viewpoint of the first scene, comprising: before the synthesis of the second image, a step for defining the colour of at least one point of the object in the second scene according to the position of this point in the first scene in such a manner that the colour or the pixel of the second image corresponding to this point indicates the position of this point in the first image, this definition step comprising: a projection operation on the object of the second scene of a third image constituted by a set of pixels, in which the colour of each pixel indicates its position in this third image, this third image being projected from a projector whose position relative to the object that it illuminates in the second scene is selected to be the same as the relative position of the viewpoint in relation to this object in the first scene, an operation for modifying the surface appearance of the object lit in such a manner that the surface of this object diffuses the lighting of the projector towards the viewpoint, and an operation for removing any spurious light sources capable of modifying the colour diffused by one or more points of the object, and also comprising after the synthesis of the second image from the second scene in which the colour of at least one point of the object was defined during the definition step, for this or that point of the object: an operation for identifying the position and the colour of a pixel of the second image corresponding to this point, an operation for deducing the position of the object in the first image from the colour identified, and an operation for determining the displacement of this pixel from the position identified in the second image and from the position deduced from the pixel colour.