Invisible coated infrared patterns

An article having at least one invisible infrared pattern, comprising:

• at least one infrared pattern printed onto a surface, the at least one infrared pattern comprising regions of high absorption and high reflection for a plurality of wavelengths of infrared radiation ranging between 700 to 2000 nm;
• and
• a coating overlaid over the at least one infrared pattern and covers at least a whole area of said at least one infrared pattern, the coating made of a material and having a thickness that is penetrable by infrared radiation and that has an average opacity value of at least 20% for light in the visible range;
• wherein said opacity value is quantified as a dimensionless number between 0% and 100%, which indicates a ratio between amount of light entering said coating and an amount of said light blocked by said coating, with 0% being a transparent material that allows all light through and 100% being an opaque object that does not permit any light through;
• and
• wherein said at least one infrared pattern is visibly blended with the surface surrounding said at least one infrared pattern by having said coating being comprised of one or more of a paper, a plastic and a polyvinyl chloride wallpaper and said coating being made of a same color as the surface and having a same texture as the surface;
• wherein the at least one infrared pattern is printed onto or adhered to a face of the material of the coating, and the face is adhered to a surface such that the coating is overlaid over the at least one infrared pattern;
• wherein the coating comprises a roll of wallpaper, and the at least one infrared pattern comprises a plurality of infrared patterns printed onto or adhered onto the face of the wallpaper.