Patent ID: 9036911
Filing Date: 2015-05-19
Classification: G06K

Abstract:
1. A method of extracting from a picked-up image an object that is situated in the foreground of a projected backdrop, the projected backdrop being formed by the projection of a known backdrop image I(s), s representing a pixel, wherein the method includes an extraction step comprising the steps of: establishing a correspondence relationship between pixels of the known backdrop image I(s) and of the background of the image as picked up, said correspondence relationship being described by a geometrical transformation function H and by a light transfer function T, said geometrical transformation function H having an initial value previously estimated by putting particular pixels into correspondence between the known backdrop image I(s) and the image as picked up; defining said object as the set of picked-up pixels that present a departure from said correspondence relationship; and iteratively updating at least the geometrical transformation function H to establish an updated correspondence relationship between the pixels of the known backdrop image I(s) and of the background of the image as picked up, wherein the geometrical transformation function H and the light transfer function T are mathematically estimated by iteratively evaluating a function which includes the geometrical transformation function H, the light transfer function T, the known backdrop image I(s), and the image E as picked up, starting with the light transfer function T having a determined initial value and the geometrical transformation function H having the initial value previously estimated.