Patent ID: 8675019

Claim:
A method of color synthesis for rendering geometrical shapes in a partially transparent heads-up display layer over a main display layer with changing contents, comprising the steps of: (a) dividing said geometrical shapes into a plurality of sub-sections, each sub-section will be colored by a local painting color; (b) assigning a local background area of predefined size and shape on the main display layer directly under each said sub-section, said local background area bounds said sub-section, and associating said local background area with said sub-section; (c) determining a representative local background color for each said local background area; (d) synthesizing a local sub-section painting color for each sub-section by applying a direct color transformation on said representative local background color of said associated background area, wherein said direct color transformation is exclusively dependent on said representative local background color, and wherein said transformation achieves a desired level of contrast between said heads up display layer and said main display layer; and (e) rendering said geometrical shapes in said partially transparent heads-up display layer using said synthesized local sub-section painting colors wherein all original colors of changing contents of said main display are preserved.