1. Device for locating an object having indifferent shape and size on a detection area, comprising: an electrically insulating layer having a first face and a second face parallel to the detection area, a first set of electrically conducting detection zones connected to each other so as to form a multiplicity of lines independent of each other which extend parallel to each other on said first face, said lines crossing a first axis at respective first fixed points each having a determined position; a second set of electrically conducting detection zones connected to each other so as to form a multiplicity of columns independent of each other which extend perpendicularly to said lines on said second face, said columns crossing a second axis at respective second fixed points each having a determined position, all said detection zones being shaped and spaced independently from the size and the shape of said object so that said object is influencing at least three lines and three columns; a scanning device comprising means for applying an electric signal on said lines and said columns, means for measuring on each line and each column an amplitude of variation of said signal due to a presence of said object, and means for identifying at least three lines and three columns subjected to said variation of signal; and a computing device provided with: i) means for determining for each identified line a coefficient proportional to the amplitude measured on said identified line, ii) means for determining the position of a virtual line parallel to said lines and crossing the first axis at a point whose position corresponds to a weighted average of the position of the first fixed points of said identified lines weighted with their respective coefficients, iii) means for determining for each identified column a coefficient proportional to the amplitude measured on said identified column, and iv) means for determining the position of a virtual column parallel to said columns and crossing the second axis at a point whose position corresponds to a weighted average of the position of the second fixed points of said identified columns weighted with their respective coefficients, said virtual line and said virtual column intersecting in a point which locates said object.