Method of capacitive measurement by non-regular electrodes, and apparatus implementing such a method

摘要

A method for providing corrected measurements of absolute capacitance of an object in the proximity of at least two independent electrodes of a non-optimized shape integrated in a human-machine interface device for detecting the object. The method includes measuring, for each electrode, an actual value of absolute capacitance between the electrode and the object, and calculating a prediction by applying a multi-variable nonlinear prediction model to the actual values of absolute capacitance so as to obtain an image of probability densities. Then, using the probability densities as corrected absolute capacitance values for detecting the object.

主权项

1. A method for providing corrected measurements of absolute capacitance of an object in the proximity of at least two independent electrodes of a non-optimized shape integrated in a human-machine interface device for the detection of said object, the method comprising:
a) measuring, for each electrode, an actual value of absolute capacitance between the electrode and the object representative of the object touching or in proximity to the interface device; and a′) calculating a prediction by applying a multi-variable nonlinear prediction model to said actual values of absolute capacitance so as to obtain an image of probability densities, and using said probability densities as corrected absolute capacitance values for the detection of one or more of a location and distance of said object with respect to the interface device, wherein the corrected absolute capacitance values compensate for the non-optimized shape of the at least two independent electrodes.